Merge branch 'v2-prototype' into refactor/check-revert-reasons

* v2-prototype: (40 commits)
  Use make-promises-safe as a preloader instead of manually importing
  Updated compiler runs to be 1,000,000
  Add event to setSignatureValidatorApproval, rename signer => signerAddress accross all contracts
  Add senderAddress to Fill and Cancel logs, add comments to events and types
  Fix Island component
  Add missing image assets for Chris and Mel
  Fix some bugs in sol-cov
  Remove unreachable PreSigned check
  Fix linting
  Buttons look hella disabled now
  Remove border radius, fix width issue for unlock step
  Add Chris and Mel to about page
  fix linter issues
  only call getLocationByOffset if source if defined
  Set settleOrder and settleMatchedOrders to private
  Prevent prettier issue
  Support mobile friendly onboarding flows
  Removed MixinSettlement. Moved `settleOrder` into `MixinExchangeCore` and `settleMatchedOrders` into `MixinMatchOrders`
  Migrations after rebasing
  Linter
  ...

11 files changed, 435 insertions, 27 deletions

diff --git a/packages/contracts/test/asset_proxy/authorizable.ts b/packages/contracts/test/asset_proxy/authorizable.ts
index 3eaef3142..1ebb094a1 100644
--- a/packages/contracts/test/asset_proxy/authorizable.ts
+++ b/packages/contracts/test/asset_proxy/authorizable.ts
@@ -1,6 +1,5 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import * as chai from 'chai';
-import 'make-promises-safe';
 
 import { MixinAuthorizableContract } from '../../src/generated_contract_wrappers/mixin_authorizable';
 import { artifacts } from '../../src/utils/artifacts';
diff --git a/packages/contracts/test/asset_proxy_owner.ts b/packages/contracts/test/asset_proxy_owner.ts
index cbe429b12..aa4999e95 100644
--- a/packages/contracts/test/asset_proxy_owner.ts
+++ b/packages/contracts/test/asset_proxy_owner.ts
@@ -2,7 +2,6 @@ import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import { LogWithDecodedArgs } from 'ethereum-types';
-import 'make-promises-safe';
 
 import {
     AssetProxyOwnerContract,
diff --git a/packages/contracts/test/ether_token.ts b/packages/contracts/test/ether_token.ts
index e2fc69aee..01093d309 100644
--- a/packages/contracts/test/ether_token.ts
+++ b/packages/contracts/test/ether_token.ts
@@ -2,7 +2,6 @@ import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
-import 'make-promises-safe';
 
 import { WETH9Contract } from '../src/generated_contract_wrappers/weth9';
 import { artifacts } from '../src/utils/artifacts';
diff --git a/packages/contracts/test/exchange/core.ts b/packages/contracts/test/exchange/core.ts
index b4649378e..32b3fffd4 100644
--- a/packages/contracts/test/exchange/core.ts
+++ b/packages/contracts/test/exchange/core.ts
@@ -6,7 +6,6 @@ import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
 import { LogWithDecodedArgs } from 'ethereum-types';
 import ethUtil = require('ethereumjs-util');
-import 'make-promises-safe';
 
 import { DummyERC20TokenContract } from '../../src/generated_contract_wrappers/dummy_e_r_c20_token';
 import { DummyERC721TokenContract } from '../../src/generated_contract_wrappers/dummy_e_r_c721_token';
@@ -402,6 +401,7 @@ describe('Exchange core', () => {
 
             expect(signedOrder.makerAddress).to.be.equal(logArgs.makerAddress);
             expect(takerAddress).to.be.equal(logArgs.takerAddress);
+            expect(takerAddress).to.be.equal(logArgs.senderAddress);
             expect(signedOrder.feeRecipientAddress).to.be.equal(logArgs.feeRecipientAddress);
             expect(signedOrder.makerAssetData).to.be.equal(logArgs.makerAssetData);
             expect(signedOrder.takerAssetData).to.be.equal(logArgs.takerAssetData);
@@ -595,6 +595,7 @@ describe('Exchange core', () => {
             const logArgs = log.args;
 
             expect(signedOrder.makerAddress).to.be.equal(logArgs.makerAddress);
+            expect(signedOrder.makerAddress).to.be.equal(logArgs.senderAddress);
             expect(signedOrder.feeRecipientAddress).to.be.equal(logArgs.feeRecipientAddress);
             expect(signedOrder.makerAssetData).to.be.equal(logArgs.makerAssetData);
             expect(signedOrder.takerAssetData).to.be.equal(logArgs.takerAssetData);
diff --git a/packages/contracts/test/exchange/signature_validator.ts b/packages/contracts/test/exchange/signature_validator.ts
index c39fd6ee4..8e221e3f1 100644
--- a/packages/contracts/test/exchange/signature_validator.ts
+++ b/packages/contracts/test/exchange/signature_validator.ts
@@ -1,14 +1,22 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
-import { assetProxyUtils, orderHashUtils } from '@0xproject/order-utils';
-import { SignedOrder } from '@0xproject/types';
+import { addSignedMessagePrefix, assetProxyUtils, MessagePrefixType, orderHashUtils } from '@0xproject/order-utils';
+import { SignatureType, SignedOrder } from '@0xproject/types';
 import * as chai from 'chai';
+import { LogWithDecodedArgs } from 'ethereum-types';
 import ethUtil = require('ethereumjs-util');
 
-import { TestSignatureValidatorContract } from '../../src/generated_contract_wrappers/test_signature_validator';
+import {
+    SignatureValidatorApprovalContractEventArgs,
+    TestSignatureValidatorContract,
+} from '../../src/generated_contract_wrappers/test_signature_validator';
+import { TestValidatorContract } from '../../src/generated_contract_wrappers/test_validator';
+import { TestWalletContract } from '../../src/generated_contract_wrappers/test_wallet';
 import { addressUtils } from '../../src/utils/address_utils';
 import { artifacts } from '../../src/utils/artifacts';
+import { expectRevertOrOtherErrorAsync } from '../../src/utils/assertions';
 import { chaiSetup } from '../../src/utils/chai_setup';
 import { constants } from '../../src/utils/constants';
+import { LogDecoder } from '../../src/utils/log_decoder';
 import { OrderFactory } from '../../src/utils/order_factory';
 import { provider, txDefaults, web3Wrapper } from '../../src/utils/web3_wrapper';
 
@@ -16,11 +24,18 @@ chaiSetup.configure();
 const expect = chai.expect;
 
 const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
-
+// tslint:disable:no-unnecessary-type-assertion
 describe('MixinSignatureValidator', () => {
     let signedOrder: SignedOrder;
     let orderFactory: OrderFactory;
     let signatureValidator: TestSignatureValidatorContract;
+    let testWallet: TestWalletContract;
+    let testValidator: TestValidatorContract;
+    let signerAddress: string;
+    let signerPrivateKey: Buffer;
+    let notSignerAddress: string;
+    let notSignerPrivateKey: Buffer;
+    let signatureValidatorLogDecoder: LogDecoder;
 
     before(async () => {
         await blockchainLifecycle.startAsync();
@@ -31,11 +46,32 @@ describe('MixinSignatureValidator', () => {
     before(async () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         const makerAddress = accounts[0];
+        signerAddress = makerAddress;
+        notSignerAddress = accounts[1];
         signatureValidator = await TestSignatureValidatorContract.deployFrom0xArtifactAsync(
             artifacts.TestSignatureValidator,
             provider,
             txDefaults,
         );
+        testWallet = await TestWalletContract.deployFrom0xArtifactAsync(
+            artifacts.TestWallet,
+            provider,
+            txDefaults,
+            signerAddress,
+        );
+        testValidator = await TestValidatorContract.deployFrom0xArtifactAsync(
+            artifacts.TestValidator,
+            provider,
+            txDefaults,
+            signerAddress,
+        );
+        signatureValidatorLogDecoder = new LogDecoder(web3Wrapper, signatureValidator.address);
+        await web3Wrapper.awaitTransactionSuccessAsync(
+            await signatureValidator.setSignatureValidatorApproval.sendTransactionAsync(testValidator.address, true, {
+                from: signerAddress,
+            }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
 
         const defaultOrderParams = {
             ...constants.STATIC_ORDER_PARAMS,
@@ -45,8 +81,9 @@ describe('MixinSignatureValidator', () => {
             makerAssetData: assetProxyUtils.encodeERC20AssetData(addressUtils.generatePseudoRandomAddress()),
             takerAssetData: assetProxyUtils.encodeERC20AssetData(addressUtils.generatePseudoRandomAddress()),
         };
-        const privateKey = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(makerAddress)];
-        orderFactory = new OrderFactory(privateKey, defaultOrderParams);
+        signerPrivateKey = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(makerAddress)];
+        notSignerPrivateKey = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(notSignerAddress)];
+        orderFactory = new OrderFactory(signerPrivateKey, defaultOrderParams);
     });
 
     beforeEach(async () => {
@@ -61,31 +98,410 @@ describe('MixinSignatureValidator', () => {
             signedOrder = orderFactory.newSignedOrder();
         });
 
-        it('should return true with a valid signature', async () => {
+        it('should revert when signature is empty', async () => {
+            const emptySignature = '0x';
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            return expectRevertOrOtherErrorAsync(
+                signatureValidator.publicIsValidSignature.callAsync(
+                    orderHashHex,
+                    signedOrder.makerAddress,
+                    emptySignature,
+                ),
+                constants.EXCHANGE_LENGTH_GREATER_THAN_0_REQUIRED,
+            );
+        });
+
+        it('should revert when signature type is unsupported', async () => {
+            const unsupportedSignatureType = SignatureType.NSignatureTypes;
+            const unsupportedSignatureHex = `0x${unsupportedSignatureType}`;
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            return expectRevertOrOtherErrorAsync(
+                signatureValidator.publicIsValidSignature.callAsync(
+                    orderHashHex,
+                    signedOrder.makerAddress,
+                    unsupportedSignatureHex,
+                ),
+                constants.EXCHANGE_SIGNATURE_UNSUPPORTED,
+            );
+        });
+
+        it('should revert when SignatureType=Illegal', async () => {
+            const unsupportedSignatureHex = `0x${SignatureType.Illegal}`;
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            return expectRevertOrOtherErrorAsync(
+                signatureValidator.publicIsValidSignature.callAsync(
+                    orderHashHex,
+                    signedOrder.makerAddress,
+                    unsupportedSignatureHex,
+                ),
+                constants.EXCHANGE_SIGNATURE_ILLEGAL,
+            );
+        });
+
+        it('should return false when SignatureType=Invalid and signature has a length of zero', async () => {
+            const signatureHex = `0x${SignatureType.Invalid}`;
             const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
             const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
                 orderHashHex,
                 signedOrder.makerAddress,
-                signedOrder.signature,
+                signatureHex,
+            );
+            expect(isValidSignature).to.be.false();
+        });
+
+        it('should revert when SignatureType=Invalid and signature length is non-zero', async () => {
+            const fillerData = ethUtil.toBuffer('0xdeadbeef');
+            const signatureType = ethUtil.toBuffer(`0x${SignatureType.Invalid}`);
+            const signatureBuffer = Buffer.concat([fillerData, signatureType]);
+            const signatureHex = ethUtil.bufferToHex(signatureBuffer);
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            return expectRevertOrOtherErrorAsync(
+                signatureValidator.publicIsValidSignature.callAsync(
+                    orderHashHex,
+                    signedOrder.makerAddress,
+                    signatureHex,
+                ),
+                constants.EXCHANGE_LENGTH_0_REQUIRED,
+            );
+        });
+
+        it('should return true when SignatureType=EIP712 and signature is valid', async () => {
+            // Create EIP712 signature
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            const orderHashBuffer = ethUtil.toBuffer(orderHashHex);
+            const ecSignature = ethUtil.ecsign(orderHashBuffer, signerPrivateKey);
+            // Create 0x signature from EIP712 signature
+            const signature = Buffer.concat([
+                ethUtil.toBuffer(ecSignature.v),
+                ecSignature.r,
+                ecSignature.s,
+                ethUtil.toBuffer(`0x${SignatureType.EIP712}`),
+            ]);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            // Validate signature
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                signerAddress,
+                signatureHex,
+            );
+            expect(isValidSignature).to.be.true();
+        });
+
+        it('should return false when SignatureType=EIP712 and signature is invalid', async () => {
+            // Create EIP712 signature
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            const orderHashBuffer = ethUtil.toBuffer(orderHashHex);
+            const ecSignature = ethUtil.ecsign(orderHashBuffer, signerPrivateKey);
+            // Create 0x signature from EIP712 signature
+            const signature = Buffer.concat([
+                ethUtil.toBuffer(ecSignature.v),
+                ecSignature.r,
+                ecSignature.s,
+                ethUtil.toBuffer(`0x${SignatureType.EIP712}`),
+            ]);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            // Validate signature.
+            // This will fail because `signerAddress` signed the message, but we're passing in `notSignerAddress`
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                notSignerAddress,
+                signatureHex,
+            );
+            expect(isValidSignature).to.be.false();
+        });
+
+        it('should return true when SignatureType=EthSign and signature is valid', async () => {
+            // Create EthSign signature
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            const orderHashWithEthSignPrefixHex = addSignedMessagePrefix(orderHashHex, MessagePrefixType.EthSign);
+            const orderHashWithEthSignPrefixBuffer = ethUtil.toBuffer(orderHashWithEthSignPrefixHex);
+            const ecSignature = ethUtil.ecsign(orderHashWithEthSignPrefixBuffer, signerPrivateKey);
+            // Create 0x signature from EthSign signature
+            const signature = Buffer.concat([
+                ethUtil.toBuffer(ecSignature.v),
+                ecSignature.r,
+                ecSignature.s,
+                ethUtil.toBuffer(`0x${SignatureType.EthSign}`),
+            ]);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            // Validate signature
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                signerAddress,
+                signatureHex,
             );
             expect(isValidSignature).to.be.true();
         });
 
-        it('should return false with an invalid signature', async () => {
-            const v = ethUtil.toBuffer(signedOrder.signature.slice(0, 4));
-            const invalidR = ethUtil.sha3('invalidR');
-            const invalidS = ethUtil.sha3('invalidS');
-            const signatureType = ethUtil.toBuffer(`0x${signedOrder.signature.slice(-2)}`);
-            const invalidSigBuff = Buffer.concat([v, invalidR, invalidS, signatureType]);
-            const invalidSigHex = `0x${invalidSigBuff.toString('hex')}`;
-            signedOrder.signature = invalidSigHex;
+        it('should return false when SignatureType=EthSign and signature is invalid', async () => {
+            // Create EthSign signature
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            const orderHashWithEthSignPrefixHex = addSignedMessagePrefix(orderHashHex, MessagePrefixType.EthSign);
+            const orderHashWithEthSignPrefixBuffer = ethUtil.toBuffer(orderHashWithEthSignPrefixHex);
+            const ecSignature = ethUtil.ecsign(orderHashWithEthSignPrefixBuffer, signerPrivateKey);
+            // Create 0x signature from EthSign signature
+            const signature = Buffer.concat([
+                ethUtil.toBuffer(ecSignature.v),
+                ecSignature.r,
+                ecSignature.s,
+                ethUtil.toBuffer(`0x${SignatureType.EthSign}`),
+            ]);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            // Validate signature.
+            // This will fail because `signerAddress` signed the message, but we're passing in `notSignerAddress`
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                notSignerAddress,
+                signatureHex,
+            );
+            expect(isValidSignature).to.be.false();
+        });
+
+        it('should return true when SignatureType=Caller and signer is caller', async () => {
+            const signature = ethUtil.toBuffer(`0x${SignatureType.Caller}`);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                signerAddress,
+                signatureHex,
+                { from: signerAddress },
+            );
+            expect(isValidSignature).to.be.true();
+        });
+
+        it('should return false when SignatureType=Caller and signer is not caller', async () => {
+            const signature = ethUtil.toBuffer(`0x${SignatureType.Caller}`);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                signerAddress,
+                signatureHex,
+                { from: notSignerAddress },
+            );
+            expect(isValidSignature).to.be.false();
+        });
+
+        it('should return true when SignatureType=Wallet and signature is valid', async () => {
+            // Create EIP712 signature
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            const orderHashBuffer = ethUtil.toBuffer(orderHashHex);
+            const ecSignature = ethUtil.ecsign(orderHashBuffer, signerPrivateKey);
+            // Create 0x signature from EIP712 signature
+            const signature = Buffer.concat([
+                ethUtil.toBuffer(ecSignature.v),
+                ecSignature.r,
+                ecSignature.s,
+                ethUtil.toBuffer(`0x${SignatureType.Wallet}`),
+            ]);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            // Validate signature
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                testWallet.address,
+                signatureHex,
+            );
+            expect(isValidSignature).to.be.true();
+        });
+
+        it('should return false when SignatureType=Wallet and signature is invalid', async () => {
+            // Create EIP712 signature using a private key that does not belong to the wallet owner.
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            const orderHashBuffer = ethUtil.toBuffer(orderHashHex);
+            const notWalletOwnerPrivateKey = notSignerPrivateKey;
+            const ecSignature = ethUtil.ecsign(orderHashBuffer, notWalletOwnerPrivateKey);
+            // Create 0x signature from EIP712 signature
+            const signature = Buffer.concat([
+                ethUtil.toBuffer(ecSignature.v),
+                ecSignature.r,
+                ecSignature.s,
+                ethUtil.toBuffer(`0x${SignatureType.Wallet}`),
+            ]);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            // Validate signature
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                testWallet.address,
+                signatureHex,
+            );
+            expect(isValidSignature).to.be.false();
+        });
+
+        it('should return true when SignatureType=Validator, signature is valid and validator is approved', async () => {
+            const validatorAddress = ethUtil.toBuffer(`${testValidator.address}`);
+            const signatureType = ethUtil.toBuffer(`0x${SignatureType.Validator}`);
+            const signature = Buffer.concat([validatorAddress, signatureType]);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                signerAddress,
+                signatureHex,
+            );
+            expect(isValidSignature).to.be.true();
+        });
+
+        it('should return false when SignatureType=Validator, signature is invalid and validator is approved', async () => {
+            const validatorAddress = ethUtil.toBuffer(`${testValidator.address}`);
+            const signatureType = ethUtil.toBuffer(`0x${SignatureType.Validator}`);
+            const signature = Buffer.concat([validatorAddress, signatureType]);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            // This will return false because we signed the message with `signerAddress`, but
+            // are validating against `notSignerAddress`
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                notSignerAddress,
+                signatureHex,
+            );
+            expect(isValidSignature).to.be.false();
+        });
+
+        it('should return false when SignatureType=Validator, signature is valid and validator is not approved', async () => {
+            // Set approval of signature validator to false
+            await web3Wrapper.awaitTransactionSuccessAsync(
+                await signatureValidator.setSignatureValidatorApproval.sendTransactionAsync(
+                    testValidator.address,
+                    false,
+                    { from: signerAddress },
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
+            // Validate signature
+            const validatorAddress = ethUtil.toBuffer(`${testValidator.address}`);
+            const signatureType = ethUtil.toBuffer(`0x${SignatureType.Validator}`);
+            const signature = Buffer.concat([validatorAddress, signatureType]);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                signerAddress,
+                signatureHex,
+            );
+            expect(isValidSignature).to.be.false();
+        });
+
+        it('should return true when SignatureType=Trezor and signature is valid', async () => {
+            // Create Trezor signature
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            const orderHashWithTrezorPrefixHex = addSignedMessagePrefix(orderHashHex, MessagePrefixType.Trezor);
+            const orderHashWithTrezorPrefixBuffer = ethUtil.toBuffer(orderHashWithTrezorPrefixHex);
+            const ecSignature = ethUtil.ecsign(orderHashWithTrezorPrefixBuffer, signerPrivateKey);
+            // Create 0x signature from Trezor signature
+            const signature = Buffer.concat([
+                ethUtil.toBuffer(ecSignature.v),
+                ecSignature.r,
+                ecSignature.s,
+                ethUtil.toBuffer(`0x${SignatureType.Trezor}`),
+            ]);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            // Validate signature
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                signerAddress,
+                signatureHex,
+            );
+            expect(isValidSignature).to.be.true();
+        });
+
+        it('should return false when SignatureType=Trezor and signature is invalid', async () => {
+            // Create Trezor signature
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            const orderHashWithTrezorPrefixHex = addSignedMessagePrefix(orderHashHex, MessagePrefixType.Trezor);
+            const orderHashWithTrezorPrefixBuffer = ethUtil.toBuffer(orderHashWithTrezorPrefixHex);
+            const ecSignature = ethUtil.ecsign(orderHashWithTrezorPrefixBuffer, signerPrivateKey);
+            // Create 0x signature from Trezor signature
+            const signature = Buffer.concat([
+                ethUtil.toBuffer(ecSignature.v),
+                ecSignature.r,
+                ecSignature.s,
+                ethUtil.toBuffer(`0x${SignatureType.Trezor}`),
+            ]);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            // Validate signature.
+            // This will fail because `signerAddress` signed the message, but we're passing in `notSignerAddress`
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                notSignerAddress,
+                signatureHex,
+            );
+            expect(isValidSignature).to.be.false();
+        });
+
+        it('should return true when SignatureType=Presigned and signer has presigned hash', async () => {
+            // Presign hash
+            const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
+            await web3Wrapper.awaitTransactionSuccessAsync(
+                await signatureValidator.preSign.sendTransactionAsync(
+                    orderHashHex,
+                    signedOrder.makerAddress,
+                    signedOrder.signature,
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
+            // Validate presigned signature
+            const signature = ethUtil.toBuffer(`0x${SignatureType.PreSigned}`);
+            const signatureHex = ethUtil.bufferToHex(signature);
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
+                orderHashHex,
+                signedOrder.makerAddress,
+                signatureHex,
+            );
+            expect(isValidSignature).to.be.true();
+        });
+
+        it('should return false when SignatureType=Presigned and signer has not presigned hash', async () => {
+            const signature = ethUtil.toBuffer(`0x${SignatureType.PreSigned}`);
+            const signatureHex = ethUtil.bufferToHex(signature);
             const orderHashHex = orderHashUtils.getOrderHashHex(signedOrder);
             const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
                 orderHashHex,
                 signedOrder.makerAddress,
-                signedOrder.signature,
+                signatureHex,
             );
             expect(isValidSignature).to.be.false();
         });
     });
+
+    describe('setSignatureValidatorApproval', () => {
+        it('should emit a SignatureValidatorApprovalSet with correct args when a validator is approved', async () => {
+            const approval = true;
+            const res = await signatureValidatorLogDecoder.getTxWithDecodedLogsAsync(
+                await signatureValidator.setSignatureValidatorApproval.sendTransactionAsync(
+                    testValidator.address,
+                    approval,
+                    {
+                        from: signerAddress,
+                    },
+                ),
+            );
+            expect(res.logs.length).to.equal(1);
+            const log = res.logs[0] as LogWithDecodedArgs<SignatureValidatorApprovalContractEventArgs>;
+            const logArgs = log.args;
+            expect(logArgs.signerAddress).to.equal(signerAddress);
+            expect(logArgs.validatorAddress).to.equal(testValidator.address);
+            expect(logArgs.approved).to.equal(approval);
+        });
+        it('should emit a SignatureValidatorApprovalSet with correct args when a validator is disapproved', async () => {
+            const approval = false;
+            const res = await signatureValidatorLogDecoder.getTxWithDecodedLogsAsync(
+                await signatureValidator.setSignatureValidatorApproval.sendTransactionAsync(
+                    testValidator.address,
+                    approval,
+                    {
+                        from: signerAddress,
+                    },
+                ),
+            );
+            expect(res.logs.length).to.equal(1);
+            const log = res.logs[0] as LogWithDecodedArgs<SignatureValidatorApprovalContractEventArgs>;
+            const logArgs = log.args;
+            expect(logArgs.signerAddress).to.equal(signerAddress);
+            expect(logArgs.validatorAddress).to.equal(testValidator.address);
+            expect(logArgs.approved).to.equal(approval);
+        });
+    });
 });
+// tslint:disable:max-file-line-count
+// tslint:enable:no-unnecessary-type-assertion
diff --git a/packages/contracts/test/exchange/wrapper.ts b/packages/contracts/test/exchange/wrapper.ts
index abba1ac4f..703f644b8 100644
--- a/packages/contracts/test/exchange/wrapper.ts
+++ b/packages/contracts/test/exchange/wrapper.ts
@@ -5,7 +5,6 @@ import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
 import * as _ from 'lodash';
-import 'make-promises-safe';
 
 import { DummyERC20TokenContract } from '../../src/generated_contract_wrappers/dummy_e_r_c20_token';
 import { DummyERC721TokenContract } from '../../src/generated_contract_wrappers/dummy_e_r_c721_token';
diff --git a/packages/contracts/test/multi_sig_with_time_lock.ts b/packages/contracts/test/multi_sig_with_time_lock.ts
index f630743e1..aa82b9edf 100644
--- a/packages/contracts/test/multi_sig_with_time_lock.ts
+++ b/packages/contracts/test/multi_sig_with_time_lock.ts
@@ -2,7 +2,6 @@ import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import { LogWithDecodedArgs } from 'ethereum-types';
-import 'make-promises-safe';
 
 import {
     MultiSigWalletWithTimeLockContract,
diff --git a/packages/contracts/test/token_registry.ts b/packages/contracts/test/token_registry.ts
index f368fd73d..095cecfce 100644
--- a/packages/contracts/test/token_registry.ts
+++ b/packages/contracts/test/token_registry.ts
@@ -3,7 +3,6 @@ import { BigNumber, NULL_BYTES } from '@0xproject/utils';
 import * as chai from 'chai';
 import ethUtil = require('ethereumjs-util');
 import * as _ from 'lodash';
-import 'make-promises-safe';
 
 import { TokenRegistryContract } from '../src/generated_contract_wrappers/token_registry';
 import { artifacts } from '../src/utils/artifacts';
diff --git a/packages/contracts/test/tutorials/arbitrage.ts b/packages/contracts/test/tutorials/arbitrage.ts
index 32fcedb43..6851483cc 100644
--- a/packages/contracts/test/tutorials/arbitrage.ts
+++ b/packages/contracts/test/tutorials/arbitrage.ts
@@ -4,7 +4,6 @@
 // import { BigNumber } from '@0xproject/utils';
 // import { Web3Wrapper } from '@0xproject/web3-wrapper';
 // import * as chai from 'chai';
-// import 'make-promises-safe';
 // import ethUtil = require('ethereumjs-util');
 // import * as Web3 from 'web3';
 
diff --git a/packages/contracts/test/unlimited_allowance_token.ts b/packages/contracts/test/unlimited_allowance_token.ts
index 0c3f5094b..7132c57bf 100644
--- a/packages/contracts/test/unlimited_allowance_token.ts
+++ b/packages/contracts/test/unlimited_allowance_token.ts
@@ -1,7 +1,6 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
-import 'make-promises-safe';
 
 import { DummyERC20TokenContract } from '../src/generated_contract_wrappers/dummy_e_r_c20_token';
 import { artifacts } from '../src/utils/artifacts';
diff --git a/packages/contracts/test/zrx_token.ts b/packages/contracts/test/zrx_token.ts
index 0629c7a88..01ae57d4a 100644
--- a/packages/contracts/test/zrx_token.ts
+++ b/packages/contracts/test/zrx_token.ts
@@ -2,7 +2,6 @@ import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
-import 'make-promises-safe';
 
 import { ZRXTokenContract } from '../src/generated_contract_wrappers/zrx_token';
 import { artifacts } from '../src/utils/artifacts';