Merge branch 'feature/instant/prod-env-switches-cdn' into feature/instant/rollbar-env

7 files changed, 2921 insertions, 0 deletions

diff --git a/packages/utils/test/abi_encoder/abi_samples/method_abis.ts b/packages/utils/test/abi_encoder/abi_samples/method_abis.ts
new file mode 100644
index 000000000..fc552c127
--- /dev/null
+++ b/packages/utils/test/abi_encoder/abi_samples/method_abis.ts
@@ -0,0 +1,780 @@
+/* tslint:disable max-file-line-count */
+import { MethodAbi } from 'ethereum-types';
+
+export const simpleAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'greg',
+            type: 'uint256',
+        },
+        {
+            name: 'gregStr',
+            type: 'string',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const stringAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'greg',
+            type: 'string[]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const GAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'a',
+                    type: 'uint256',
+                },
+                {
+                    name: 'b',
+                    type: 'string',
+                },
+                {
+                    name: 'e',
+                    type: 'bytes',
+                },
+                {
+                    name: 'f',
+                    type: 'address',
+                },
+            ],
+
+            name: 'f',
+            type: 'tuple',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const typesWithDefaultWidthsAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'someUint',
+            type: 'uint',
+        },
+        {
+            name: 'someInt',
+            type: 'int',
+        },
+        {
+            name: 'someByte',
+            type: 'byte',
+        },
+        {
+            name: 'someUint',
+            type: 'uint[]',
+        },
+        {
+            name: 'someInt',
+            type: 'int[]',
+        },
+        {
+            name: 'someByte',
+            type: 'byte[]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const multiDimensionalArraysStaticTypeAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'a',
+            type: 'uint8[][][]',
+        },
+        {
+            name: 'b',
+            type: 'uint8[][][2]',
+        },
+        {
+            name: 'c',
+            type: 'uint8[][2][]',
+        },
+        {
+            name: 'd',
+            type: 'uint8[2][][]',
+        },
+        {
+            name: 'e',
+            type: 'uint8[][2][2]',
+        },
+        {
+            name: 'f',
+            type: 'uint8[2][2][]',
+        },
+        {
+            name: 'g',
+            type: 'uint8[2][][2]',
+        },
+        {
+            name: 'h',
+            type: 'uint8[2][2][2]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const multiDimensionalArraysDynamicTypeAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'a',
+            type: 'string[][][]',
+        },
+        {
+            name: 'b',
+            type: 'string[][][2]',
+        },
+        {
+            name: 'c',
+            type: 'string[][2][]',
+        },
+        {
+            name: 'h',
+            type: 'string[2][2][2]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const dynamicTupleAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'someUint',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someStr',
+                    type: 'string',
+                },
+            ],
+            name: 'order',
+            type: 'tuple',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const arrayOfStaticTuplesWithDefinedLengthAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'someUint',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someUint2',
+                    type: 'uint256',
+                },
+            ],
+            name: 'order',
+            type: 'tuple[8]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const arrayOfStaticTuplesWithDynamicLengthAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'someUint',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someUint2',
+                    type: 'uint256',
+                },
+            ],
+            name: 'order',
+            type: 'tuple[]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const arrayOfDynamicTuplesWithDefinedLengthAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'someUint',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someString',
+                    type: 'string',
+                },
+            ],
+            name: 'order',
+            type: 'tuple[8]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const arrayOfDynamicTuplesWithUndefinedLengthAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'someUint',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someString',
+                    type: 'string',
+                },
+            ],
+            name: 'order',
+            type: 'tuple[]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const arrayOfDynamicTuplesAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'someUint',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someString',
+                    type: 'string',
+                },
+            ],
+            name: 'order',
+            type: 'tuple[]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const multidimensionalArrayOfDynamicTuplesAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'someUint',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someString',
+                    type: 'string',
+                },
+            ],
+            name: 'order',
+            type: 'tuple[][2][]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const staticTupleAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'someUint1',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someUint2',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someUint3',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someBool',
+                    type: 'bool',
+                },
+            ],
+            name: 'order',
+            type: 'tuple',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const staticArrayAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'someStaticArray',
+            type: 'uint8[3]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const staticArrayDynamicMembersAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'someStaticArray',
+            type: 'string[3]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const dynamicArrayDynamicMembersAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'someStaticArray',
+            type: 'string[]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const dynamicArrayStaticMembersAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'someStaticArray',
+            type: 'uint8[]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const largeFlatAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'someUInt256',
+            type: 'uint256',
+        },
+        {
+            name: 'someInt256',
+            type: 'int256',
+        },
+        {
+            name: 'someInt32',
+            type: 'int32',
+        },
+        {
+            name: 'someByte',
+            type: 'byte',
+        },
+        {
+            name: 'someBytes32',
+            type: 'bytes32',
+        },
+        {
+            name: 'someBytes',
+            type: 'bytes',
+        },
+        {
+            name: 'someString',
+            type: 'string',
+        },
+        {
+            name: 'someAddress',
+            type: 'address',
+        },
+        {
+            name: 'someBool',
+            type: 'bool',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const largeNestedAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'someStaticArray',
+            type: 'uint8[3]',
+        },
+        {
+            name: 'someStaticArrayWithDynamicMembers',
+            type: 'string[2]',
+        },
+        {
+            name: 'someDynamicArrayWithDynamicMembers',
+            type: 'bytes[]',
+        },
+        {
+            name: 'some2DArray',
+            type: 'string[][]',
+        },
+        {
+            name: 'someTuple',
+            type: 'tuple',
+            components: [
+                {
+                    name: 'someUint32',
+                    type: 'uint32',
+                },
+                {
+                    name: 'someStr',
+                    type: 'string',
+                },
+            ],
+        },
+        {
+            name: 'someTupleWithDynamicTypes',
+            type: 'tuple',
+            components: [
+                {
+                    name: 'someUint',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someStr',
+                    type: 'string',
+                },
+                /*{
+                    name: 'someStrArray',
+                    type: 'string[]',
+                },*/
+                {
+                    name: 'someBytes',
+                    type: 'bytes',
+                },
+                {
+                    name: 'someAddress',
+                    type: 'address',
+                },
+            ],
+        },
+        {
+            name: 'someArrayOfTuplesWithDynamicTypes',
+            type: 'tuple[]',
+            components: [
+                {
+                    name: 'someUint',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someStr',
+                    type: 'string',
+                },
+                /*{
+                    name: 'someStrArray',
+                    type: 'string[]',
+                },*/
+                {
+                    name: 'someBytes',
+                    type: 'bytes',
+                },
+                {
+                    name: 'someAddress',
+                    type: 'address',
+                },
+            ],
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const nestedTuples: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'firstTuple',
+            type: 'tuple[1]',
+            components: [
+                {
+                    name: 'someUint32',
+                    type: 'uint32',
+                },
+                {
+                    name: 'nestedTuple',
+                    type: 'tuple',
+                    components: [
+                        {
+                            name: 'someUint',
+                            type: 'uint256',
+                        },
+                        {
+                            name: 'someAddress',
+                            type: 'address',
+                        },
+                    ],
+                },
+            ],
+        },
+        {
+            name: 'secondTuple',
+            type: 'tuple[]',
+            components: [
+                {
+                    name: 'someUint',
+                    type: 'uint256',
+                },
+                {
+                    name: 'someStr',
+                    type: 'string',
+                },
+                {
+                    name: 'nestedTuple',
+                    type: 'tuple',
+                    components: [
+                        {
+                            name: 'someUint32',
+                            type: 'uint32',
+                        },
+                        {
+                            name: 'secondNestedTuple',
+                            type: 'tuple',
+                            components: [
+                                {
+                                    name: 'someUint',
+                                    type: 'uint256',
+                                },
+                                {
+                                    name: 'someStr',
+                                    type: 'string',
+                                },
+                                {
+                                    name: 'someBytes',
+                                    type: 'bytes',
+                                },
+                                {
+                                    name: 'someAddress',
+                                    type: 'address',
+                                },
+                            ],
+                        },
+                    ],
+                },
+                {
+                    name: 'someBytes',
+                    type: 'bytes',
+                },
+                {
+                    name: 'someAddress',
+                    type: 'address',
+                },
+            ],
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const simpleAbi2: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'someByte',
+            type: 'byte',
+        },
+        {
+            name: 'someBytes32',
+            type: 'bytes32',
+        },
+        {
+            name: 'someBytes',
+            type: 'bytes',
+        },
+        {
+            name: 'someString',
+            type: 'string',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const fillOrderAbi: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'makerAddress',
+                    type: 'address',
+                },
+                {
+                    name: 'takerAddress',
+                    type: 'address',
+                },
+                {
+                    name: 'feeRecipientAddress',
+                    type: 'address',
+                },
+                {
+                    name: 'senderAddress',
+                    type: 'address',
+                },
+                {
+                    name: 'makerAssetAmount',
+                    type: 'uint256',
+                },
+                {
+                    name: 'takerAssetAmount',
+                    type: 'uint256',
+                },
+                {
+                    name: 'makerFee',
+                    type: 'uint256',
+                },
+                {
+                    name: 'takerFee',
+                    type: 'uint256',
+                },
+                {
+                    name: 'expirationTimeSeconds',
+                    type: 'uint256',
+                },
+                {
+                    name: 'salt',
+                    type: 'uint256',
+                },
+                {
+                    name: 'makerAssetData',
+                    type: 'bytes',
+                },
+                {
+                    name: 'takerAssetData',
+                    type: 'bytes',
+                },
+            ],
+            name: 'order',
+            type: 'tuple',
+        },
+        {
+            name: 'takerAssetFillAmount',
+            type: 'uint256',
+        },
+        {
+            name: 'salt',
+            type: 'uint256',
+        },
+        {
+            name: 'orderSignature',
+            type: 'bytes',
+        },
+        {
+            name: 'takerSignature',
+            type: 'bytes',
+        },
+    ],
+    name: 'fillOrder',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
diff --git a/packages/utils/test/abi_encoder/abi_samples/optimizer_abis.ts b/packages/utils/test/abi_encoder/abi_samples/optimizer_abis.ts
new file mode 100644
index 000000000..7cfd7a118
--- /dev/null
+++ b/packages/utils/test/abi_encoder/abi_samples/optimizer_abis.ts
@@ -0,0 +1,340 @@
+/* tslint:disable max-file-line-count */
+import { MethodAbi } from 'ethereum-types';
+
+export const duplicateDynamicArraysWithStaticElements: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'array1',
+            type: 'uint[]',
+        },
+        {
+            name: 'array2',
+            type: 'uint[]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const duplicateDynamicArraysWithDynamicElements: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'array1',
+            type: 'string[]',
+        },
+        {
+            name: 'array2',
+            type: 'string[]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const duplicateStaticArraysWithStaticElements: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'array1',
+            type: 'uint[2]',
+        },
+        {
+            name: 'array2',
+            type: 'uint[2]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const duplicateStaticArraysWithDynamicElements: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'array1',
+            type: 'string[2]',
+        },
+        {
+            name: 'array2',
+            type: 'string[2]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const duplicateArrayElements: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'array',
+            type: 'string[]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const duplicateTupleFields: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'field1',
+                    type: 'string',
+                },
+                {
+                    name: 'field2',
+                    type: 'string',
+                },
+            ],
+            name: 'Tuple',
+            type: 'tuple',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const duplicateStrings: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'string1',
+            type: 'string',
+        },
+        {
+            name: 'string2',
+            type: 'string',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const duplicateBytes: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'bytes1',
+            type: 'bytes',
+        },
+        {
+            name: 'bytes2',
+            type: 'bytes',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const duplicateTuples: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'field1',
+                    type: 'string',
+                },
+                {
+                    name: 'field2',
+                    type: 'uint',
+                },
+            ],
+            name: 'Tuple',
+            type: 'tuple',
+        },
+        {
+            components: [
+                {
+                    name: 'field1',
+                    type: 'string',
+                },
+                {
+                    name: 'field2',
+                    type: 'uint',
+                },
+            ],
+            name: 'Tuple',
+            type: 'tuple',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const duplicateArraysNestedInTuples: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    name: 'field',
+                    type: 'uint[]',
+                },
+            ],
+            name: 'Tuple1',
+            type: 'tuple',
+        },
+        {
+            components: [
+                {
+                    name: 'field',
+                    type: 'uint[]',
+                },
+                {
+                    name: 'extraField',
+                    type: 'string',
+                },
+            ],
+            name: 'Tuple2',
+            type: 'tuple',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const duplicateTuplesNestedInTuples: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            components: [
+                {
+                    components: [
+                        {
+                            name: 'nestedField',
+                            type: 'string',
+                        },
+                    ],
+                    name: 'field',
+                    type: 'tuple',
+                },
+            ],
+            name: 'Tuple1',
+            type: 'tuple',
+        },
+        {
+            components: [
+                {
+                    components: [
+                        {
+                            name: 'nestedField',
+                            type: 'string',
+                        },
+                    ],
+                    name: 'field',
+                    type: 'tuple',
+                },
+                {
+                    name: 'extraField',
+                    type: 'string',
+                },
+            ],
+            name: 'Tuple1',
+            type: 'tuple',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const duplicateTwoDimensionalArrays: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'array1',
+            type: 'string[][]',
+        },
+        {
+            name: 'array2',
+            type: 'string[][]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const arrayElementsDuplicatedAsSeparateParameter: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'stringArray',
+            type: 'string[]',
+        },
+        {
+            name: 'string',
+            type: 'string',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const arrayElementsDuplicatedAsTupleFields: MethodAbi = {
+    constant: false,
+    inputs: [
+        {
+            name: 'uint8Array',
+            type: 'uint8[]',
+        },
+        {
+            components: [
+                {
+                    name: 'uint',
+                    type: 'uint',
+                },
+            ],
+            name: 'uintTuple',
+            type: 'tuple[]',
+        },
+    ],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
diff --git a/packages/utils/test/abi_encoder/abi_samples/return_value_abis.ts b/packages/utils/test/abi_encoder/abi_samples/return_value_abis.ts
new file mode 100644
index 000000000..ac2124011
--- /dev/null
+++ b/packages/utils/test/abi_encoder/abi_samples/return_value_abis.ts
@@ -0,0 +1,99 @@
+/* tslint:disable max-file-line-count */
+import { MethodAbi } from 'ethereum-types';
+
+export const noReturnValues: MethodAbi = {
+    constant: false,
+    inputs: [],
+    name: 'simpleFunction',
+    outputs: [],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const singleStaticReturnValue: MethodAbi = {
+    constant: false,
+    inputs: [],
+    name: 'simpleFunction',
+    outputs: [
+        {
+            name: 'Bytes4',
+            type: 'bytes4',
+        },
+    ],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const multipleStaticReturnValues: MethodAbi = {
+    constant: false,
+    inputs: [],
+    name: 'simpleFunction',
+    outputs: [
+        {
+            name: 'val1',
+            type: 'bytes4',
+        },
+        {
+            name: 'val2',
+            type: 'bytes4',
+        },
+    ],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const singleDynamicReturnValue: MethodAbi = {
+    constant: false,
+    inputs: [],
+    name: 'simpleFunction',
+    outputs: [
+        {
+            name: 'val',
+            type: 'bytes',
+        },
+    ],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const multipleDynamicReturnValues: MethodAbi = {
+    constant: false,
+    inputs: [],
+    name: 'simpleFunction',
+    outputs: [
+        {
+            name: 'val1',
+            type: 'bytes',
+        },
+        {
+            name: 'val2',
+            type: 'bytes',
+        },
+    ],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
+
+export const mixedStaticAndDynamicReturnValues: MethodAbi = {
+    constant: false,
+    inputs: [],
+    name: 'simpleFunction',
+    outputs: [
+        {
+            name: 'val1',
+            type: 'bytes4',
+        },
+        {
+            name: 'val2',
+            type: 'bytes',
+        },
+    ],
+    payable: false,
+    stateMutability: 'nonpayable',
+    type: 'function',
+};
diff --git a/packages/utils/test/abi_encoder/evm_data_types_test.ts b/packages/utils/test/abi_encoder/evm_data_types_test.ts
new file mode 100644
index 000000000..9ef80a560
--- /dev/null
+++ b/packages/utils/test/abi_encoder/evm_data_types_test.ts
@@ -0,0 +1,1007 @@
+/* tslint:disable max-file-line-count */
+import * as chai from 'chai';
+import * as ethUtil from 'ethereumjs-util';
+import 'mocha';
+
+import { AbiEncoder, BigNumber } from '../../src/';
+import { chaiSetup } from '../utils/chai_setup';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
+    const encodingRules: AbiEncoder.EncodingRules = { optimize: false }; // optimizer is tested separately.
+    describe('Array', () => {
+        it('Fixed size; Static elements', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'testArray', type: 'int[2]' };
+            const dataType = new AbiEncoder.Array(testDataItem);
+            // Construct args to be encoded
+            const args = [new BigNumber(5), new BigNumber(6)];
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x00000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000006';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Dynamic size; Static elements', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'testArray', type: 'int[]' };
+            const dataType = new AbiEncoder.Array(testDataItem);
+            // Construct args to be encoded
+            const args = [new BigNumber(5), new BigNumber(6)];
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000006';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Fixed size; Dynamic elements', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'testArray', type: 'string[2]' };
+            const dataType = new AbiEncoder.Array(testDataItem);
+            // Construct args to be encoded
+            const args = ['Hello', 'world'];
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005776f726c64000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Dynamic size; Dynamic elements', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'testArray', type: 'string[]' };
+            const dataType = new AbiEncoder.Array(testDataItem);
+            // Construct args to be encoded
+            const args = ['Hello', 'world'];
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005776f726c64000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Dynamic Size; Multidimensional; Dynamic Elements', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'testArray', type: 'bytes[][]' };
+            const dataType = new AbiEncoder.Array(testDataItem);
+            // Construct args to be encoded
+            const array1 = ['0x01020304', '0x05060708', '0x09101112'];
+            const array2 = ['0x10111213', '0x14151617'];
+            const array3 = ['0x18192021'];
+            const args = [array1, array2, array3];
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x0000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000001a000000000000000000000000000000000000000000000000000000000000002800000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000040102030400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000405060708000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004091011120000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000041011121300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000414151617000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000041819202100000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Dynamic Size; Multidimensional; Static Elements', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'testArray', type: 'bytes4[][]' };
+            const dataType = new AbiEncoder.Array(testDataItem);
+            // Construct args to be encoded
+            const array1 = ['0x01020304', '0x05060708', '0x09101112'];
+            const array2 = ['0x10111213', '0x14151617'];
+            const array3 = ['0x18192021'];
+            const args = [array1, array2, array3];
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x0000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000140000000000000000000000000000000000000000000000000000000000000000301020304000000000000000000000000000000000000000000000000000000000506070800000000000000000000000000000000000000000000000000000000091011120000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000021011121300000000000000000000000000000000000000000000000000000000141516170000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000011819202100000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Static Size; Multidimensional; Static Elements', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'testArray', type: 'bytes4[3][2]' };
+            const dataType = new AbiEncoder.Array(testDataItem);
+            // Construct args to be encoded
+            const array1 = ['0x01020304', '0x05060708', '0x09101112'];
+            const array2 = ['0x10111213', '0x14151617', '0x18192021'];
+            const args = [array1, array2];
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x010203040000000000000000000000000000000000000000000000000000000005060708000000000000000000000000000000000000000000000000000000000910111200000000000000000000000000000000000000000000000000000000101112130000000000000000000000000000000000000000000000000000000014151617000000000000000000000000000000000000000000000000000000001819202100000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Static Size; Multidimensional; Dynamic Elements', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'testArray', type: 'bytes[3][2]' };
+            const dataType = new AbiEncoder.Array(testDataItem);
+            // Construct args to be encoded
+            const array1 = ['0x01020304', '0x05060708', '0x09101112'];
+            const array2 = ['0x10111213', '0x14151617', '0x18192021'];
+            const args = [array1, array2];
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000160000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000000401020304000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004050607080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040910111200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000000410111213000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004141516170000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000041819202100000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Static size; Too Few Elements', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'testArray', type: 'string[3]' };
+            const dataType = new AbiEncoder.Array(testDataItem);
+            // Construct args to be encoded
+            const args = ['Hello', 'world'];
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw('Expected array of 3 elements, but got array of length 2');
+        });
+        it('Static size; Too Many Elements', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'testArray', type: 'string[1]' };
+            const dataType = new AbiEncoder.Array(testDataItem);
+            // Construct args to be encoded
+            const args = ['Hello', 'world'];
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw('Expected array of 1 elements, but got array of length 2');
+        });
+        it('Element Type Mismatch', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'testArray', type: 'uint[]' };
+            const dataType = new AbiEncoder.Array(testDataItem);
+            // Construct args to be encoded
+            const args = [new BigNumber(1), 'Bad Argument'];
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw();
+        });
+    });
+
+    describe('Tuple', () => {
+        it('Static elements only', async () => {
+            // Create DataType object
+            const testDataItem = {
+                name: 'Tuple',
+                type: 'tuple',
+                components: [{ name: 'field_1', type: 'int32' }, { name: 'field_2', type: 'bool' }],
+            };
+            const dataType = new AbiEncoder.Tuple(testDataItem);
+            // Construct args to be encoded
+            const args = { field_1: new BigNumber(-5), field_2: true };
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb0000000000000000000000000000000000000000000000000000000000000001';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodingRules: AbiEncoder.DecodingRules = { structsAsObjects: true };
+            const decodedArgs = dataType.decode(encodedArgs, decodingRules);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Dynamic elements only', async () => {
+            // Create DataType object
+            const testDataItem = {
+                name: 'Tuple',
+                type: 'tuple',
+                components: [{ name: 'field_1', type: 'string' }, { name: 'field_2', type: 'bytes' }],
+            };
+            const dataType = new AbiEncoder.Tuple(testDataItem);
+            // Construct args to be encoded
+            const args = { field_1: 'Hello, World!', field_2: '0xabcdef0123456789' };
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000d48656c6c6f2c20576f726c6421000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008abcdef0123456789000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodingRules: AbiEncoder.DecodingRules = { structsAsObjects: true };
+            const decodedArgs = dataType.decode(encodedArgs, decodingRules);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Nested Static Array', async () => {
+            // Create DataType object
+            const testDataItem = {
+                name: 'Tuple',
+                type: 'tuple',
+                components: [{ name: 'field', type: 'uint[2]' }],
+            };
+            const dataType = new AbiEncoder.Tuple(testDataItem);
+            // Construct args to be encoded
+            const args = { field: [new BigNumber(1), new BigNumber(2)] };
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodingRules: AbiEncoder.DecodingRules = { structsAsObjects: true };
+            const decodedArgs = dataType.decode(encodedArgs, decodingRules);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Nested Dynamic Array', async () => {
+            // Create DataType object
+            const testDataItem = {
+                name: 'Tuple',
+                type: 'tuple',
+                components: [{ name: 'field', type: 'uint[]' }],
+            };
+            const dataType = new AbiEncoder.Tuple(testDataItem);
+            // Construct args to be encoded
+            const args = { field: [new BigNumber(1), new BigNumber(2)] };
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodingRules: AbiEncoder.DecodingRules = { structsAsObjects: true };
+            const decodedArgs = dataType.decode(encodedArgs, decodingRules);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Nested Static Multidimensional Array', async () => {
+            // Create DataType object
+            const testDataItem = {
+                name: 'Tuple',
+                type: 'tuple',
+                components: [{ name: 'field', type: 'bytes4[2][2]' }],
+            };
+            const dataType = new AbiEncoder.Tuple(testDataItem);
+            // Construct args to be encoded
+            const array1 = ['0x01020304', '0x05060708'];
+            const array2 = ['0x09101112', '0x13141516'];
+            const args = { field: [array1, array2] };
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x0102030400000000000000000000000000000000000000000000000000000000050607080000000000000000000000000000000000000000000000000000000009101112000000000000000000000000000000000000000000000000000000001314151600000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodingRules: AbiEncoder.DecodingRules = { structsAsObjects: true };
+            const decodedArgs = dataType.decode(encodedArgs, decodingRules);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Nested Dynamic Multidimensional Array', async () => {
+            // Create DataType object
+            const testDataItem = {
+                name: 'Tuple',
+                type: 'tuple',
+                components: [{ name: 'field', type: 'bytes[2][2]' }],
+            };
+            const dataType = new AbiEncoder.Tuple(testDataItem);
+            // Construct args to be encoded
+            const array1 = ['0x01020304', '0x05060708'];
+            const array2 = ['0x09101112', '0x13141516'];
+            const args = { field: [array1, array2] };
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000004010203040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040506070800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000004091011120000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000041314151600000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodingRules: AbiEncoder.DecodingRules = { structsAsObjects: true };
+            const decodedArgs = dataType.decode(encodedArgs, decodingRules);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Static and dynamic elements mixed', async () => {
+            // Create DataType object
+            const testDataItem = {
+                name: 'Tuple',
+                type: 'tuple',
+                components: [
+                    { name: 'field_1', type: 'int32' },
+                    { name: 'field_2', type: 'string' },
+                    { name: 'field_3', type: 'bool' },
+                    { name: 'field_4', type: 'bytes' },
+                ],
+            };
+            const dataType = new AbiEncoder.Tuple(testDataItem);
+            // Construct args to be encoded
+            const args = {
+                field_1: new BigNumber(-5),
+                field_2: 'Hello, World!',
+                field_3: true,
+                field_4: '0xabcdef0123456789',
+            };
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '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';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodingRules: AbiEncoder.DecodingRules = { structsAsObjects: true };
+            const decodedArgs = dataType.decode(encodedArgs, decodingRules);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Missing Key', async () => {
+            // Create DataType object
+            const testDataItem = {
+                name: 'Tuple',
+                type: 'tuple',
+                components: [{ name: 'field_1', type: 'int32' }, { name: 'field_2', type: 'bool' }],
+            };
+            const dataType = new AbiEncoder.Tuple(testDataItem);
+            // Construct args to be encoded
+            const args = { field_1: new BigNumber(-5) };
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw('Could not assign tuple to object: missing keys field_2');
+        });
+        it('Bad Key', async () => {
+            // Create DataType object
+            const testDataItem = {
+                name: 'Tuple',
+                type: 'tuple',
+                components: [{ name: 'field_1', type: 'int32' }, { name: 'field_2', type: 'bool' }],
+            };
+            const dataType = new AbiEncoder.Tuple(testDataItem);
+            // Construct args to be encoded
+            const args = { unknown_field: new BigNumber(-5) };
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw("Could not assign tuple to object: unrecognized key 'unknown_field' in object Tuple");
+        });
+    });
+
+    describe('Address', () => {
+        it('Valid Address', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Address', type: 'address' };
+            const dataType = new AbiEncoder.Address(testDataItem);
+            // Construct args to be encoded
+            const args = '0xe41d2489571d322189246dafa5ebde1f4699f498';
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x000000000000000000000000e41d2489571d322189246dafa5ebde1f4699f498';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Invalid Address - input is not valid hex', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Address', type: 'address' };
+            const dataType = new AbiEncoder.Address(testDataItem);
+            // Construct args to be encoded
+            const args = 'e4';
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw(`Invalid address: '${args}'`);
+        });
+        it('Invalid Address - input is not 20 bytes', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Address', type: 'address' };
+            const dataType = new AbiEncoder.Address(testDataItem);
+            // Construct args to be encoded
+            const args = '0xe4';
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw(`Invalid address: '${args}'`);
+        });
+    });
+
+    describe('Bool', () => {
+        it('True', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Boolean', type: 'bool' };
+            const dataType = new AbiEncoder.Bool(testDataItem);
+            // Construct args to be encoded
+            const args = true;
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x0000000000000000000000000000000000000000000000000000000000000001';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('False', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Boolean', type: 'bool' };
+            const dataType = new AbiEncoder.Bool(testDataItem);
+            // Construct args to be encoded
+            const args = false;
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x0000000000000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+    });
+
+    describe('Integer', () => {
+        /* tslint:disable custom-no-magic-numbers */
+        const max256BitInteger = new BigNumber(2).pow(255).minus(1);
+        const min256BitInteger = new BigNumber(2).pow(255).times(-1);
+        const max32BitInteger = new BigNumber(2).pow(31).minus(1);
+        const min32BitInteger = new BigNumber(2).pow(31).times(-1);
+        /* tslint:enable custom-no-magic-numbers */
+
+        it('Int256 - Positive Base Case', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Integer (256)', type: 'int' };
+            const dataType = new AbiEncoder.Int(testDataItem);
+            // Construct args to be encoded
+            const args = new BigNumber(1);
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x0000000000000000000000000000000000000000000000000000000000000001';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Int256 - Negative Base Case', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Integer (256)', type: 'int' };
+            const dataType = new AbiEncoder.Int(testDataItem);
+            // Construct args to be encoded
+            const args = new BigNumber(-1);
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Int256 - Positive Value', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Integer (256)', type: 'int' };
+            const dataType = new AbiEncoder.Int(testDataItem);
+            // Construct args to be encoded
+            const args = max256BitInteger;
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Int256 - Negative Value', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Integer (256)', type: 'int' };
+            const dataType = new AbiEncoder.Int(testDataItem);
+            // Construct args to be encoded
+            const args = min256BitInteger;
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = `0x8000000000000000000000000000000000000000000000000000000000000000`;
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Int256 - Value too large', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Integer (256)', type: 'int' };
+            const dataType = new AbiEncoder.Int(testDataItem);
+            // Construct args to be encoded
+            const args = max256BitInteger.plus(1);
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw();
+        });
+        it('Int256 - Value too small', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Integer (256)', type: 'int' };
+            const dataType = new AbiEncoder.Int(testDataItem);
+            // Construct args to be encoded
+            const args = min256BitInteger.minus(1);
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw();
+        });
+        it('Int32 - Positive Base Case', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Integer (32)', type: 'int32' };
+            const dataType = new AbiEncoder.Int(testDataItem);
+            // Construct args to be encoded
+            const args = new BigNumber(1);
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x0000000000000000000000000000000000000000000000000000000000000001';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Int32 - Negative Base Case', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Integer (32)', type: 'int32' };
+            const dataType = new AbiEncoder.Int(testDataItem);
+            // Construct args to be encoded
+            const args = new BigNumber(-1);
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Int32 - Positive Value', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Integer (32)', type: 'int32' };
+            const dataType = new AbiEncoder.Int(testDataItem);
+            // Construct args to be encoded
+            const args = max32BitInteger;
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x000000000000000000000000000000000000000000000000000000007fffffff';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Int32 - Negative Value', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Integer (32)', type: 'int32' };
+            const dataType = new AbiEncoder.Int(testDataItem);
+            // Construct args to be encoded
+            const args = min32BitInteger;
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = `0xffffffffffffffffffffffffffffffffffffffffffffffffffffffff80000000`;
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Int32 - Value too large', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Integer (32)', type: 'int32' };
+            const dataType = new AbiEncoder.Int(testDataItem);
+            // Construct args to be encoded
+            const args = max32BitInteger.plus(1);
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw();
+        });
+        it('Int32 - Value too small', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Integer (32)', type: 'int32' };
+            const dataType = new AbiEncoder.Int(testDataItem);
+            // Construct args to be encoded
+            const args = min32BitInteger.minus(1);
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw();
+        });
+    });
+
+    describe('Unsigned Integer', () => {
+        /* tslint:disable custom-no-magic-numbers */
+        const max256BitUnsignedInteger = new BigNumber(2).pow(256).minus(1);
+        const min256BitUnsignedInteger = new BigNumber(0);
+        const max32BitUnsignedInteger = new BigNumber(2).pow(32).minus(1);
+        const min32BitUnsignedInteger = new BigNumber(0);
+        /* tslint:enable custom-no-magic-numbers */
+
+        it('UInt256 - Positive Base Case', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Unsigned Integer (256)', type: 'uint' };
+            const dataType = new AbiEncoder.UInt(testDataItem);
+            // Construct args to be encoded
+            const args = new BigNumber(1);
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x0000000000000000000000000000000000000000000000000000000000000001';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('UInt256 - Positive Value', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Unsigned Integer (256)', type: 'uint' };
+            const dataType = new AbiEncoder.UInt(testDataItem);
+            // Construct args to be encoded
+            const args = max256BitUnsignedInteger;
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('UInt256 - Zero Value', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Unsigned Integer (256)', type: 'uint' };
+            const dataType = new AbiEncoder.UInt(testDataItem);
+            // Construct args to be encoded
+            const args = min256BitUnsignedInteger;
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = `0x0000000000000000000000000000000000000000000000000000000000000000`;
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('UInt256 - Value too large', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Unsigned Integer (256)', type: 'uint' };
+            const dataType = new AbiEncoder.UInt(testDataItem);
+            // Construct args to be encoded
+            const args = max256BitUnsignedInteger.plus(1);
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw();
+        });
+        it('UInt256 - Value too small', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Unsigned Integer (256)', type: 'uint' };
+            const dataType = new AbiEncoder.UInt(testDataItem);
+            // Construct args to be encoded
+            const args = min256BitUnsignedInteger.minus(1);
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw();
+        });
+        it('UInt32 - Positive Base Case', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Unsigned Integer (32)', type: 'uint32' };
+            const dataType = new AbiEncoder.UInt(testDataItem);
+            // Construct args to be encoded
+            const args = new BigNumber(1);
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x0000000000000000000000000000000000000000000000000000000000000001';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('UInt32 - Positive Value', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Unsigned Integer (32)', type: 'uint32' };
+            const dataType = new AbiEncoder.UInt(testDataItem);
+            // Construct args to be encoded
+            const args = max32BitUnsignedInteger;
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x00000000000000000000000000000000000000000000000000000000ffffffff';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('UInt32 - Zero Value', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Unsigned Integer (32)', type: 'uint32' };
+            const dataType = new AbiEncoder.UInt(testDataItem);
+            // Construct args to be encoded
+            const args = min32BitUnsignedInteger;
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = `0x0000000000000000000000000000000000000000000000000000000000000000`;
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('UInt32 - Value too large', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Unsigned Integer (32)', type: 'uint32' };
+            const dataType = new AbiEncoder.UInt(testDataItem);
+            // Construct args to be encoded
+            const args = max32BitUnsignedInteger.plus(1);
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw();
+        });
+        it('UInt32 - Value too small', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Unsigned Integer (32)', type: 'uint32' };
+            const dataType = new AbiEncoder.UInt(testDataItem);
+            // Construct args to be encoded
+            const args = min32BitUnsignedInteger.minus(1);
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw();
+        });
+    });
+
+    describe('Static Bytes', () => {
+        it('Single Byte (byte)', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Static Byte', type: 'byte' };
+            const dataType = new AbiEncoder.StaticBytes(testDataItem);
+            // Construct args to be encoded
+            const args = '0x05';
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x0500000000000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Single Byte (bytes1)', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Static Bytes1', type: 'bytes1' };
+            const dataType = new AbiEncoder.StaticBytes(testDataItem);
+            // Construct args to be encoded
+            const args = '0x05';
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x0500000000000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('4 Bytes (bytes4)', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Static Bytes4', type: 'bytes4' };
+            const dataType = new AbiEncoder.StaticBytes(testDataItem);
+            // Construct args to be encoded
+            const args = '0x00010203';
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x0001020300000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('4 Bytes (bytes4); Encoder must pad input', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Static Bytes4', type: 'bytes4' };
+            const dataType = new AbiEncoder.StaticBytes(testDataItem);
+            // Construct args to be encoded
+            // Note: There will be padding because this is a bytes32 but we are only passing in 4 bytes.
+            const args = '0x1a18';
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x1a18000000000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            const paddedArgs = '0x1a180000';
+            expect(decodedArgs).to.be.deep.equal(paddedArgs);
+        });
+        it('32 Bytes (bytes32)', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Static Bytes32', type: 'bytes32' };
+            const dataType = new AbiEncoder.StaticBytes(testDataItem);
+            // Construct args to be encoded
+            const args = '0x0001020304050607080911121314151617181920212223242526272829303132';
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x0001020304050607080911121314151617181920212223242526272829303132';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('32 Bytes (bytes32); Encoder must pad input', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Static Bytes32', type: 'bytes32' };
+            const dataType = new AbiEncoder.StaticBytes(testDataItem);
+            // Construct args to be encoded
+            // Note: There will be padding because this is a bytes32 but we are only passing in 4 bytes.
+            const args = '0x1a18bf61';
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs = '0x1a18bf6100000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            const paddedArgs = '0x1a18bf6100000000000000000000000000000000000000000000000000000000';
+            expect(decodedArgs).to.be.deep.equal(paddedArgs);
+        });
+        it('Should throw when pass in too many bytes (bytes4)', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Static Bytes4', type: 'bytes4' };
+            const dataType = new AbiEncoder.StaticBytes(testDataItem);
+            // Construct args to be encoded
+            const args = '0x0102030405';
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw(
+                'Tried to assign 0x0102030405 (5 bytes), which exceeds max bytes that can be stored in a bytes4',
+            );
+        });
+        it('Should throw when pass in too many bytes (bytes32)', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Static Bytes32', type: 'bytes32' };
+            const dataType = new AbiEncoder.StaticBytes(testDataItem);
+            // Construct args to be encoded
+            const args = '0x010203040506070809101112131415161718192021222324252627282930313233';
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw(
+                'Tried to assign 0x010203040506070809101112131415161718192021222324252627282930313233 (33 bytes), which exceeds max bytes that can be stored in a bytes32',
+            );
+        });
+        it('Should throw when pass in bad hex (no 0x prefix)', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Static Bytes32', type: 'bytes32' };
+            const dataType = new AbiEncoder.StaticBytes(testDataItem);
+            // Construct args to be encoded
+            const args = '0102030405060708091011121314151617181920212223242526272829303132';
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw("Tried to encode non-hex value. Value must inlcude '0x' prefix.");
+        });
+        it('Should throw when pass in bad hex (include a half-byte)', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Static Bytes32', type: 'bytes32' };
+            const dataType = new AbiEncoder.StaticBytes(testDataItem);
+            // Construct args to be encoded
+            const args = '0x010';
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw('Tried to assign 0x010, which is contains a half-byte. Use full bytes only.');
+        });
+    });
+
+    describe('Dynamic Bytes', () => {
+        it('Fits into one EVM word', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Dynamic Bytes', type: 'bytes' };
+            const dataType = new AbiEncoder.DynamicBytes(testDataItem);
+            // Construct args to be encoded
+            // Note: There will be padding because this is a bytes32 but we are only passing in 4 bytes.
+            const args = '0x1a18bf61';
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x00000000000000000000000000000000000000000000000000000000000000041a18bf6100000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Spans multiple EVM words', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Dynamic Bytes', type: 'bytes' };
+            const dataType = new AbiEncoder.DynamicBytes(testDataItem);
+            // Construct args to be encoded
+            // Note: There will be padding because this is a bytes32 but we are only passing in 4 bytes.
+            const bytesLength = 40;
+            const args = '0x' + '61'.repeat(bytesLength);
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x000000000000000000000000000000000000000000000000000000000000002861616161616161616161616161616161616161616161616161616161616161616161616161616161000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Input as Buffer', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Dynamic Bytes', type: 'bytes' };
+            const dataType = new AbiEncoder.DynamicBytes(testDataItem);
+            // Construct args to be encoded
+            // Note: There will be padding because this is a bytes32 but we are only passing in 4 bytes.
+            const args = '0x1a18bf61';
+            const argsAsBuffer = ethUtil.toBuffer(args);
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(argsAsBuffer);
+            const expectedEncodedArgs =
+                '0x00000000000000000000000000000000000000000000000000000000000000041a18bf6100000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Should throw when pass in bad hex (no 0x prefix)', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Static Bytes', type: 'bytes' };
+            const dataType = new AbiEncoder.DynamicBytes(testDataItem);
+            // Construct args to be encoded
+            const args = '01';
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw("Tried to encode non-hex value. Value must inlcude '0x' prefix.");
+        });
+        it('Should throw when pass in bad hex (include a half-byte)', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'Static Bytes', type: 'bytes' };
+            const dataType = new AbiEncoder.DynamicBytes(testDataItem);
+            // Construct args to be encoded
+            const args = '0x010';
+            // Encode Args and validate result
+            expect(() => {
+                dataType.encode(args, encodingRules);
+            }).to.throw('Tried to assign 0x010, which is contains a half-byte. Use full bytes only.');
+        });
+    });
+
+    describe('String', () => {
+        it('Fits into one EVM word', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'String', type: 'string' };
+            const dataType = new AbiEncoder.String(testDataItem);
+            // Construct args to be encoded
+            // Note: There will be padding because this is a bytes32 but we are only passing in 4 bytes.
+            const args = 'five';
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x00000000000000000000000000000000000000000000000000000000000000046669766500000000000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('Spans multiple EVM words', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'String', type: 'string' };
+            const dataType = new AbiEncoder.String(testDataItem);
+            // Construct args to be encoded
+            // Note: There will be padding because this is a bytes32 but we are only passing in 4 bytes.
+            const bytesLength = 40;
+            const args = 'a'.repeat(bytesLength);
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x000000000000000000000000000000000000000000000000000000000000002861616161616161616161616161616161616161616161616161616161616161616161616161616161000000000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+        it('String that begins with 0x prefix', async () => {
+            // Create DataType object
+            const testDataItem = { name: 'String', type: 'string' };
+            const dataType = new AbiEncoder.String(testDataItem);
+            // Construct args to be encoded
+            // Note: There will be padding because this is a bytes32 but we are only passing in 4 bytes.
+            const strLength = 40;
+            const args = '0x' + 'a'.repeat(strLength);
+            // Encode Args and validate result
+            const encodedArgs = dataType.encode(args, encodingRules);
+            const expectedEncodedArgs =
+                '0x000000000000000000000000000000000000000000000000000000000000002a30786161616161616161616161616161616161616161616161616161616161616161616161616161616100000000000000000000000000000000000000000000';
+            expect(encodedArgs).to.be.equal(expectedEncodedArgs);
+            // Decode Encoded Args and validate result
+            const decodedArgs = dataType.decode(encodedArgs);
+            expect(decodedArgs).to.be.deep.equal(args);
+        });
+    });
+});
diff --git a/packages/utils/test/abi_encoder/methods_test.ts b/packages/utils/test/abi_encoder/methods_test.ts
new file mode 100644
index 000000000..837020883
--- /dev/null
+++ b/packages/utils/test/abi_encoder/methods_test.ts
@@ -0,0 +1,366 @@
+import * as chai from 'chai';
+import 'mocha';
+
+import { AbiEncoder, BigNumber } from '../../src/';
+import { chaiSetup } from '../utils/chai_setup';
+
+import * as AbiSamples from './abi_samples/method_abis';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+describe('ABI Encoder: Method Encoding / Decoding', () => {
+    const encodingRules: AbiEncoder.EncodingRules = { optimize: false }; // optimizer is tested separately.
+    it('Types with default widths', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(AbiSamples.typesWithDefaultWidthsAbi);
+        const args = [new BigNumber(1), new BigNumber(-1), '0x56', [new BigNumber(1)], [new BigNumber(-1)], ['0x56']];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x09f2b0c30000000000000000000000000000000000000000000000000000000000000001ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff560000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000140000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00000000000000000000000000000000000000000000000000000000000000015600000000000000000000000000000000000000000000000000000000000000';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Array of Static Tuples (Array has defined length)', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(AbiSamples.arrayOfStaticTuplesWithDefinedLengthAbi);
+        let value = 0;
+        const arrayOfTuples = [];
+        const arrayOfTuplesLength = 8;
+        for (let i = 0; i < arrayOfTuplesLength; ++i) {
+            arrayOfTuples.push([new BigNumber(++value), new BigNumber(++value)]);
+        }
+        const args = [arrayOfTuples];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x9eb20969000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000700000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000f0000000000000000000000000000000000000000000000000000000000000010';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Array of Static Tuples (Array has dynamic length)', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(AbiSamples.arrayOfStaticTuplesWithDynamicLengthAbi);
+        let value = 0;
+        const arrayOfTuples = [];
+        const arrayOfTuplesLength = 8;
+        for (let i = 0; i < arrayOfTuplesLength; ++i) {
+            arrayOfTuples.push([new BigNumber(++value), new BigNumber(++value)]);
+        }
+        const args = [arrayOfTuples];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x63275d6e00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000700000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000f0000000000000000000000000000000000000000000000000000000000000010';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Array of Dynamic Tuples (Array has defined length)', async () => {
+        // Generate Calldata
+        const method = new AbiEncoder.Method(AbiSamples.arrayOfDynamicTuplesWithDefinedLengthAbi);
+        let value = 0;
+        const arrayOfTuples = [];
+        const arrayOfTuplesLength = 8;
+        for (let i = 0; i < arrayOfTuplesLength; ++i) {
+            arrayOfTuples.push([new BigNumber(++value), new BigNumber(++value).toString()]);
+        }
+        const args = [arrayOfTuples];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0xdeedb00f00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000018000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000280000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000000000003800000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000048000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000132000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000013400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000500000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000001360000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000070000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000138000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023130000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023132000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023134000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000f000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023136000000000000000000000000000000000000000000000000000000000000';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Array of Dynamic Tuples (Array has dynamic length)', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(AbiSamples.arrayOfDynamicTuplesWithUndefinedLengthAbi);
+        let value = 0;
+        const arrayOfTuples = [];
+        const arrayOfTuplesLength = 8;
+        for (let i = 0; i < arrayOfTuplesLength; ++i) {
+            arrayOfTuples.push([new BigNumber(++value), new BigNumber(++value).toString()]);
+        }
+        const args = [arrayOfTuples];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x60c847fb000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000018000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000280000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000000000003800000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000048000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000132000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000013400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000500000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000001360000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000070000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000138000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023130000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023132000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023134000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000f000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023136000000000000000000000000000000000000000000000000000000000000';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Multidimensional Arrays / Static Members', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(AbiSamples.multiDimensionalArraysStaticTypeAbi);
+        // Eight 3-dimensional arrays of uint8[2][2][2]
+        let value = 0;
+        const args = [];
+        const argsLength = 8;
+        for (let i = 0; i < argsLength; ++i) {
+            args.push([
+                [[new BigNumber(++value), new BigNumber(++value)], [new BigNumber(++value), new BigNumber(++value)]],
+                [[new BigNumber(++value), new BigNumber(++value)], [new BigNumber(++value), new BigNumber(++value)]],
+            ]);
+        }
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0xc2f47d6f00000000000000000000000000000000000000000000000000000000000001e00000000000000000000000000000000000000000000000000000000000000480000000000000000000000000000000000000000000000000000000000000070000000000000000000000000000000000000000000000000000000000000009600000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000000d400000000000000000000000000000000000000000000000000000000000000e600000000000000000000000000000000000000000000000000000000000000039000000000000000000000000000000000000000000000000000000000000003a000000000000000000000000000000000000000000000000000000000000003b000000000000000000000000000000000000000000000000000000000000003c000000000000000000000000000000000000000000000000000000000000003d000000000000000000000000000000000000000000000000000000000000003e000000000000000000000000000000000000000000000000000000000000003f00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000001600000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000070000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000001600000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000f0000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000140000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000012000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000130000000000000000000000000000000000000000000000000000000000000014000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000150000000000000000000000000000000000000000000000000000000000000016000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000170000000000000000000000000000000000000000000000000000000000000018000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000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+        expect(calldata).to.be.equal(expectedCalldata);
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Multidimensional Arrays / Dynamic Members', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(AbiSamples.multiDimensionalArraysDynamicTypeAbi);
+        // Eight 3-dimensional arrays of string[2][2][2]
+        let value = 0;
+        const args = [];
+        const argsLength = 4;
+        for (let i = 0; i < argsLength; ++i) {
+            args.push([
+                [
+                    [new BigNumber(++value).toString(), new BigNumber(++value).toString()],
+                    [new BigNumber(++value).toString(), new BigNumber(++value).toString()],
+                ],
+                [
+                    [new BigNumber(++value).toString(), new BigNumber(++value).toString()],
+                    [new BigNumber(++value).toString(), new BigNumber(++value).toString()],
+                ],
+            ]);
+        }
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x81534ebd0000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000052000000000000000000000000000000000000000000000000000000000000009a00000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000026000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000012000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000132000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000001330000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000013400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000135000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001360000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000138000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000026000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000012000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000231300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000002313100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000023132000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000231330000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002313400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000023135000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000231360000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Fixed Length Array / Dynamic Members', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(AbiSamples.staticArrayDynamicMembersAbi);
+        const args = [['Brave', 'New', 'World']];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x243a6e6e0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000005427261766500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034e657700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Fixed Length Array / Dynamic Members', async () => {
+        // Generaet calldata
+        const method = new AbiEncoder.Method(AbiSamples.staticArrayDynamicMembersAbi);
+        const args = [['Brave', 'New', 'World']];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x243a6e6e0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000005427261766500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034e657700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Unfixed Length Array / Dynamic Members ABI', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(AbiSamples.dynamicArrayDynamicMembersAbi);
+        const args = [['Brave', 'New', 'World']];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x13e751a900000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000005427261766500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034e657700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Unfixed Length Array / Static Members ABI', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(AbiSamples.dynamicArrayStaticMembersAbi);
+        const args = [[new BigNumber(127), new BigNumber(14), new BigNumber(54)]];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x4fc8a83300000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000007f000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000036';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Fixed Length Array / Static Members ABI', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(AbiSamples.staticArrayAbi);
+        const args = [[new BigNumber(127), new BigNumber(14), new BigNumber(54)]];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0xf68ade72000000000000000000000000000000000000000000000000000000000000007f000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000036';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Array ABI', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(AbiSamples.stringAbi);
+        const args = [['five', 'six', 'seven']];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x13e751a900000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000046669766500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000373697800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005736576656e000000000000000000000000000000000000000000000000000000';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Static Tuple', async () => {
+        // Generate calldata
+        // This is dynamic because it has dynamic members
+        const method = new AbiEncoder.Method(AbiSamples.staticTupleAbi);
+        const args = [[new BigNumber(5), new BigNumber(10), new BigNumber(15), false]];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0xa9125e150000000000000000000000000000000000000000000000000000000000000005000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000f0000000000000000000000000000000000000000000000000000000000000000';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Dynamic Tuple (Array input)', async () => {
+        // Generate calldata
+        // This is dynamic because it has dynamic members
+        const method = new AbiEncoder.Method(AbiSamples.dynamicTupleAbi);
+        const args = [[new BigNumber(5), 'five']];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x5b998f3500000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000005000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000046669766500000000000000000000000000000000000000000000000000000000';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Dynamic Tuple (Object input)', async () => {
+        // Generate Calldata
+        // This is dynamic because it has dynamic members
+        const method = new AbiEncoder.Method(AbiSamples.dynamicTupleAbi);
+        const args = [[new BigNumber(5), 'five']];
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x5b998f3500000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000005000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000046669766500000000000000000000000000000000000000000000000000000000';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Large, Flat ABI', async () => {
+        // Construct calldata
+        const method = new AbiEncoder.Method(AbiSamples.largeFlatAbi);
+        const args = [
+            new BigNumber(256745454),
+            new BigNumber(-256745454),
+            new BigNumber(434244),
+            '0x43',
+            '0x0001020304050607080911121314151617181920212223242526272829303132',
+            '0x0001020304050607080911121314151617181920212223242526272829303132080911121314151617181920212223242526272829303132',
+            'Little peter piper piped a piping pepper pot',
+            '0xe41d2489571d322189246dafa5ebde1f4699f498',
+            true,
+        ];
+        // Validate calldata
+        const calldata = method.encode(args, encodingRules);
+        const expectedCalldata =
+            '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';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata);
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+    it('Large, Nested ABI', async () => {
+        // Construct Calldata
+        const method = new AbiEncoder.Method(AbiSamples.largeNestedAbi);
+        const someStaticArray = [new BigNumber(127), new BigNumber(14), new BigNumber(54)];
+        const someStaticArrayWithDynamicMembers = [
+            'the little piping piper piped a piping pipper papper',
+            'the kid knows how to write poems, what can I say -- I guess theres a lot I could say to try to fill this line with a lot of text.',
+        ];
+        const someDynamicArrayWithDynamicMembers = [
+            '0x38745637834987324827439287423897238947239847',
+            '0x7283472398237423984723984729847248927498748974284728947239487498749847874329423743492347329847239842374892374892374892347238947289478947489374289472894738942749823743298742389472389473289472389437249823749823742893472398',
+            '0x283473298473248923749238742398742398472894729843278942374982374892374892743982',
+        ];
+        const some2DArray = [
+            [
+                'some string',
+                'some another string',
+                'there are just too many stringsup in',
+                'here',
+                'yall ghonna make me lose my mind',
+            ],
+            [
+                'the little piping piper piped a piping pipper papper',
+                'the kid knows how to write poems, what can I say -- I guess theres a lot I could say to try to fill this line with a lot of text.',
+            ],
+            [],
+        ];
+        const someTuple = {
+            someUint32: new BigNumber(4037824789),
+            someStr:
+                'the kid knows how to write poems, what can I say -- I guess theres a lot I could say to try to fill this line with a lot of text.',
+        };
+        const someTupleWithDynamicTypes = {
+            someUint: new BigNumber(4024789),
+            someStr: 'akdhjasjkdhasjkldshdjahdkjsahdajksdhsajkdhsajkdhadjkashdjksadhajkdhsajkdhsadjk',
+            someBytes: '0x29384723894723843743289742389472398473289472348927489274894738427428947389facdea',
+            someAddress: '0xe41d2489571d322189246dafa5ebde1f4699f498',
+        };
+        const someTupleWithDynamicTypes2 = {
+            someUint: new BigNumber(9024789),
+            someStr: 'ksdhsajkdhsajkdhadjkashdjksadhajkdhsajkdhsadjkakdhjasjkdhasjkldshdjahdkjsahdaj',
+            someBytes: '0x29384723894398473289472348927489272384374328974238947274894738427428947389facde1',
+            someAddress: '0x746dafa5ebde1f4699f4981d3221892e41d24895',
+        };
+        const someTupleWithDynamicTypes3 = {
+            someUint: new BigNumber(1024789),
+            someStr: 'sdhsajkdhsajkdhadjkashdjakdhjasjkdhasjkldshdjahdkjsahdajkksadhajkdhsajkdhsadjk',
+            someBytes: '0x38947238437432829384729742389472398473289472348927489274894738427428947389facdef',
+            someAddress: '0x89571d322189e415ebde1f4699f498d24246dafa',
+        };
+        const someArrayOfTuplesWithDynamicTypes = [someTupleWithDynamicTypes2, someTupleWithDynamicTypes3];
+        const args = {
+            someStaticArray,
+            someStaticArrayWithDynamicMembers,
+            someDynamicArrayWithDynamicMembers,
+            some2DArray,
+            someTuple,
+            someTupleWithDynamicTypes,
+            someArrayOfTuplesWithDynamicTypes,
+        };
+        const calldata = method.encode(args, encodingRules);
+        // Validate calldata
+        const expectedCalldata =
+            '0x4b49031c000000000000000000000000000000000000000000000000000000000000007f000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000036000000000000000000000000000000000000000000000000000000000000012000000000000000000000000000000000000000000000000000000000000002800000000000000000000000000000000000000000000000000000000000000440000000000000000000000000000000000000000000000000000000000000088000000000000000000000000000000000000000000000000000000000000009800000000000000000000000000000000000000000000000000000000000000ae0000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000034746865206c6974746c6520706970696e67207069706572207069706564206120706970696e6720706970706572207061707065720000000000000000000000000000000000000000000000000000000000000000000000000000000000000081746865206b6964206b6e6f777320686f7720746f20777269746520706f656d732c20776861742063616e204920736179202d2d2049206775657373207468657265732061206c6f74204920636f756c642073617920746f2074727920746f2066696c6c2074686973206c696e6520776974682061206c6f74206f6620746578742e000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000014000000000000000000000000000000000000000000000000000000000000000163874563783498732482743928742389723894723984700000000000000000000000000000000000000000000000000000000000000000000000000000000006e72834723982374239847239847298472489274987489742847289472394874987498478743294237434923473298472398423748923748923748923472389472894789474893742894728947389427498237432987423894723894732894723894372498237498237428934723980000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000027283473298473248923749238742398742398472894729843278942374982374892374892743982000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000002800000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000000500000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000018000000000000000000000000000000000000000000000000000000000000001c0000000000000000000000000000000000000000000000000000000000000000b736f6d6520737472696e670000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000013736f6d6520616e6f7468657220737472696e67000000000000000000000000000000000000000000000000000000000000000000000000000000000000000024746865726520617265206a75737420746f6f206d616e7920737472696e6773757020696e0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000046865726500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002079616c6c2067686f6e6e61206d616b65206d65206c6f7365206d79206d696e640000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000034746865206c6974746c6520706970696e67207069706572207069706564206120706970696e6720706970706572207061707065720000000000000000000000000000000000000000000000000000000000000000000000000000000000000081746865206b6964206b6e6f777320686f7720746f20777269746520706f656d732c20776861742063616e204920736179202d2d2049206775657373207468657265732061206c6f74204920636f756c642073617920746f2074727920746f2066696c6c2074686973206c696e6520776974682061206c6f74206f6620746578742e00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000f0ac511500000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000081746865206b6964206b6e6f777320686f7720746f20777269746520706f656d732c20776861742063616e204920736179202d2d2049206775657373207468657265732061206c6f74204920636f756c642073617920746f2074727920746f2066696c6c2074686973206c696e6520776974682061206c6f74206f6620746578742e0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003d69d500000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000100000000000000000000000000e41d2489571d322189246dafa5ebde1f4699f498000000000000000000000000000000000000000000000000000000000000004e616b64686a61736a6b646861736a6b6c647368646a6168646b6a73616864616a6b73646873616a6b646873616a6b646861646a6b617368646a6b73616468616a6b646873616a6b64687361646a6b000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002829384723894723843743289742389472398473289472348927489274894738427428947389facdea0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000001a0000000000000000000000000000000000000000000000000000000000089b51500000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000100000000000000000000000000746dafa5ebde1f4699f4981d3221892e41d24895000000000000000000000000000000000000000000000000000000000000004e6b73646873616a6b646873616a6b646861646a6b617368646a6b73616468616a6b646873616a6b64687361646a6b616b64686a61736a6b646861736a6b6c647368646a6168646b6a73616864616a000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002829384723894398473289472348927489272384374328974238947274894738427428947389facde100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000fa3150000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000010000000000000000000000000089571d322189e415ebde1f4699f498d24246dafa000000000000000000000000000000000000000000000000000000000000004e73646873616a6b646873616a6b646861646a6b617368646a616b64686a61736a6b646861736a6b6c647368646a6168646b6a73616864616a6b6b73616468616a6b646873616a6b64687361646a6b000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002838947238437432829384729742389472398473289472348927489274894738427428947389facdef000000000000000000000000000000000000000000000000';
+        expect(calldata).to.be.equal(expectedCalldata);
+        // Validate decoding
+        const decodedValue = method.decode(calldata, { structsAsObjects: true });
+        expect(decodedValue).to.be.deep.equal(args);
+    });
+});
diff --git a/packages/utils/test/abi_encoder/optimizer_test.ts b/packages/utils/test/abi_encoder/optimizer_test.ts
new file mode 100644
index 000000000..18aa6549a
--- /dev/null
+++ b/packages/utils/test/abi_encoder/optimizer_test.ts
@@ -0,0 +1,262 @@
+import * as chai from 'chai';
+import 'mocha';
+
+import { AbiEncoder, BigNumber } from '../../src/';
+import { chaiSetup } from '../utils/chai_setup';
+
+import * as OptimizedAbis from './abi_samples/optimizer_abis';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
+    const encodingRules: AbiEncoder.EncodingRules = { optimize: true };
+    it('Duplicate Dynamic Arrays with Static Elements', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateDynamicArraysWithStaticElements);
+        const array1 = [new BigNumber(100), new BigNumber(150)];
+        const array2 = array1;
+        const args = [array1, array2];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0x7221063300000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000640000000000000000000000000000000000000000000000000000000000000096';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Dynamic Arrays with Dynamic Elements', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateDynamicArraysWithDynamicElements);
+        const array1 = ['Hello', 'World'];
+        const array2 = array1;
+        const args = [array1, array2];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0xbb4f12e300000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Static Arrays with Static Elements (should not optimize)', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateStaticArraysWithStaticElements);
+        const array1 = [new BigNumber(100), new BigNumber(150)];
+        const array2 = array1;
+        const args = [array1, array2];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0x7f8130430000000000000000000000000000000000000000000000000000000000000064000000000000000000000000000000000000000000000000000000000000009600000000000000000000000000000000000000000000000000000000000000640000000000000000000000000000000000000000000000000000000000000096';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        const unoptimizedCalldata = method.encode(args);
+        expect(optimizedCalldata).to.be.equal(unoptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Static Arrays with Dynamic Elements', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateStaticArraysWithDynamicElements);
+        const array1 = ['Hello', 'World'];
+        const array2 = array1;
+        const args = [array1, array2];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0x9fe31f8e0000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Array Elements (should optimize)', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateArrayElements);
+        const strings = ['Hello', 'World', 'Hello', 'World'];
+        const args = [strings];
+        // Validate calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0x13e751a900000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Tuple Fields', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateTupleFields);
+        const tuple = ['Hello', 'Hello'];
+        const args = [tuple];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0x16780a5e000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000548656c6c6f000000000000000000000000000000000000000000000000000000';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Strings', async () => {
+        // Description:
+        //   Two dynamic arrays with the same values.
+        //   In the optimized calldata, only one set of elements should be included.
+        //   Both arrays should point to this set.
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateStrings);
+        const args = ['Hello', 'Hello'];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0x07370bfa00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000548656c6c6f000000000000000000000000000000000000000000000000000000';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Bytes', async () => {
+        // Description:
+        //   Two dynamic arrays with the same values.
+        //   In the optimized calldata, only one set of elements should be included.
+        //   Both arrays should point to this set.
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateBytes);
+        const value = '0x01020304050607080910111213141516171819202122232425262728293031323334353637383940';
+        const args = [value, value];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0x6045e42900000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000002801020304050607080910111213141516171819202122232425262728293031323334353637383940000000000000000000000000000000000000000000000000';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Tuples', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateTuples);
+        const tuple1 = ['Hello, World!', new BigNumber(424234)];
+        const tuple2 = tuple1;
+        const args = [tuple1, tuple2];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0x564f826d000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000006792a000000000000000000000000000000000000000000000000000000000000000d48656c6c6f2c20576f726c642100000000000000000000000000000000000000';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Fields Across Two Tuples', async () => {
+        // Description:
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateTuples);
+        const tuple1 = ['Hello, World!', new BigNumber(1)];
+        const tuple2 = [tuple1[0], new BigNumber(2)];
+        const args = [tuple1, tuple2];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0x564f826d000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000d48656c6c6f2c20576f726c642100000000000000000000000000000000000000';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Arrays, Nested in Separate Tuples', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateArraysNestedInTuples);
+        const array = [new BigNumber(100), new BigNumber(150), new BigNumber(200)];
+        const tuple1 = [array];
+        const tuple2 = [array, 'extra argument to prevent exactly matching the tuples'];
+        const args = [tuple1, tuple2];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0x18970a9e000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000000000064000000000000000000000000000000000000000000000000000000000000009600000000000000000000000000000000000000000000000000000000000000c80000000000000000000000000000000000000000000000000000000000000035657874726120617267756d656e7420746f2070726576656e742065786163746c79206d61746368696e6720746865207475706c65730000000000000000000000';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Tuples, Nested in Separate Tuples', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateTuplesNestedInTuples);
+        const nestedTuple = ['Hello, World!'];
+        const tuple1 = [nestedTuple];
+        const tuple2 = [nestedTuple, 'extra argument to prevent exactly matching the tuples'];
+        const args = [tuple1, tuple2];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '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';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Two-Dimensional Arrays', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateTwoDimensionalArrays);
+        const twoDimArray1 = [['Hello', 'World'], ['Foo', 'Bar', 'Zaa']];
+        const twoDimArray2 = twoDimArray1;
+        const args = [twoDimArray1, twoDimArray2];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, { optimize: false });
+        const expectedOptimizedCalldata =
+            '0x0d28c4f9000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000002c0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c640000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000003466f6f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003426172000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000035a61610000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c640000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000003466f6f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003426172000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000035a61610000000000000000000000000000000000000000000000000000000000';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Duplicate Array, Nested within Separate Two-Dimensional Arrays', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.duplicateTwoDimensionalArrays);
+        const twoDimArray1 = [['Hello', 'World'], ['Foo']];
+        const twoDimArray2 = [['Hello', 'World'], ['Bar']];
+        const args = [twoDimArray1, twoDimArray2];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0x0d28c4f900000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000001200000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003466f6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c640000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000034261720000000000000000000000000000000000000000000000000000000000';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Array Elements Duplicated as Tuple Fields', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.arrayElementsDuplicatedAsTupleFields);
+        const array = [new BigNumber(100), new BigNumber(150), new BigNumber(200), new BigNumber(225)];
+        const tuple = [[array[0]], [array[1]], [array[2]], [array[3]]];
+        const args = [array, tuple];
+        // Validata calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0x5b5c78fd0000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000064000000000000000000000000000000000000000000000000000000000000009600000000000000000000000000000000000000000000000000000000000000c800000000000000000000000000000000000000000000000000000000000000e1';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+    it('Array Elements Duplicated as Separate Parameter', async () => {
+        // Generate calldata
+        const method = new AbiEncoder.Method(OptimizedAbis.arrayElementsDuplicatedAsSeparateParameter);
+        const array = ['Hello', 'Hello', 'Hello', 'World'];
+        const str = 'Hello';
+        const args = [array, str];
+        // Validate calldata
+        const optimizedCalldata = method.encode(args, encodingRules);
+        const expectedOptimizedCalldata =
+            '0xe0e0d34900000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000548656c6c6f000000000000000000000000000000000000000000000000000000';
+        expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
+        // Validate decoding
+        const decodedArgs = method.decode(optimizedCalldata);
+        expect(decodedArgs).to.be.deep.equal(args);
+    });
+});
diff --git a/packages/utils/test/abi_encoder/return_values_test.ts b/packages/utils/test/abi_encoder/return_values_test.ts
new file mode 100644
index 000000000..a8cdd6ca3
--- /dev/null
+++ b/packages/utils/test/abi_encoder/return_values_test.ts
@@ -0,0 +1,67 @@
+import * as chai from 'chai';
+import 'mocha';
+
+import { AbiEncoder } from '../../src/';
+import { chaiSetup } from '../utils/chai_setup';
+
+import * as ReturnValueAbis from './abi_samples/return_value_abis';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+describe('ABI Encoder: Return Value Encoding/Decoding', () => {
+    const encodingRules: AbiEncoder.EncodingRules = { optimize: false }; // optimizer is tested separately.
+    it('No Return Value', async () => {
+        // Decode return value
+        const method = new AbiEncoder.Method(ReturnValueAbis.noReturnValues);
+        const returnValue = '0x';
+        const decodedReturnValue = method.decodeReturnValues(returnValue);
+        const expectedDecodedReturnValue: any[] = [];
+        expect(decodedReturnValue).to.be.deep.equal(expectedDecodedReturnValue);
+    });
+    it('Single static return value', async () => {
+        // Generate Return Value
+        const method = new AbiEncoder.Method(ReturnValueAbis.singleStaticReturnValue);
+        const returnValue = ['0x01020304'];
+        const encodedReturnValue = method.encodeReturnValues(returnValue, encodingRules);
+        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue);
+        // Validate decoded return value
+        expect(decodedReturnValue).to.be.deep.equal(returnValue);
+    });
+    it('Multiple static return values', async () => {
+        // Generate Return Value
+        const method = new AbiEncoder.Method(ReturnValueAbis.multipleStaticReturnValues);
+        const returnValue = ['0x01020304', '0x05060708'];
+        const encodedReturnValue = method.encodeReturnValues(returnValue, encodingRules);
+        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue);
+        // Validate decoded return value
+        expect(decodedReturnValue).to.be.deep.equal(returnValue);
+    });
+    it('Single dynamic return value', async () => {
+        // Generate Return Value
+        const method = new AbiEncoder.Method(ReturnValueAbis.singleDynamicReturnValue);
+        const returnValue = ['0x01020304'];
+        const encodedReturnValue = method.encodeReturnValues(returnValue, encodingRules);
+        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue);
+        // Validate decoded return value
+        expect(decodedReturnValue).to.be.deep.equal(returnValue);
+    });
+    it('Multiple dynamic return values', async () => {
+        // Generate Return Value
+        const method = new AbiEncoder.Method(ReturnValueAbis.multipleDynamicReturnValues);
+        const returnValue = ['0x01020304', '0x05060708'];
+        const encodedReturnValue = method.encodeReturnValues(returnValue, encodingRules);
+        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue);
+        // Validate decoded return value
+        expect(decodedReturnValue).to.be.deep.equal(returnValue);
+    });
+    it('Mixed static/dynamic return values', async () => {
+        // Generate Return Value
+        const method = new AbiEncoder.Method(ReturnValueAbis.mixedStaticAndDynamicReturnValues);
+        const returnValue = ['0x01020304', '0x05060708'];
+        const encodedReturnValue = method.encodeReturnValues(returnValue, encodingRules);
+        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue);
+        // Validate decoded return value
+        expect(decodedReturnValue).to.be.deep.equal(returnValue);
+    });
+});