Improve an error message when an inorrect number of constructor params is passed

8 files changed, 33 insertions, 14 deletions

diff --git a/packages/contracts/test/exchange/core.ts b/packages/contracts/test/exchange/core.ts
index 303d745aa..ad5b3a083 100644
--- a/packages/contracts/test/exchange/core.ts
+++ b/packages/contracts/test/exchange/core.ts
@@ -56,9 +56,9 @@ describe('Exchange', () => {
         maker = accounts[0];
         [tokenOwner, taker, feeRecipient] = accounts;
         const [repInstance, dgdInstance, zrxInstance] = await Promise.all([
-            deployer.deployAsync(ContractName.DummyToken),
-            deployer.deployAsync(ContractName.DummyToken),
-            deployer.deployAsync(ContractName.DummyToken),
+            deployer.deployAsync(ContractName.DummyToken, []),
+            deployer.deployAsync(ContractName.DummyToken, constants.DUMMY_TOKEN_ARGS),
+            deployer.deployAsync(ContractName.DummyToken, constants.DUMMY_TOKEN_ARGS),
         ]);
         rep = new DummyTokenContract(web3Wrapper, repInstance.abi, repInstance.address);
         dgd = new DummyTokenContract(web3Wrapper, dgdInstance.abi, dgdInstance.address);
@@ -128,7 +128,7 @@ describe('Exchange', () => {
         await blockchainLifecycle.revertAsync();
     });
     describe('internal functions', () => {
-        it('should include transferViaTokenTransferProxy', () => {
+        it.only('should include transferViaTokenTransferProxy', () => {
             expect((exchange as any).transferViaTokenTransferProxy).to.be.undefined();
         });
 
diff --git a/packages/contracts/test/exchange/helpers.ts b/packages/contracts/test/exchange/helpers.ts
index 9869c2155..625234729 100644
--- a/packages/contracts/test/exchange/helpers.ts
+++ b/packages/contracts/test/exchange/helpers.ts
@@ -39,9 +39,9 @@ describe('Exchange', () => {
         const tokenRegistry = await deployer.deployAsync(ContractName.TokenRegistry);
         const tokenTransferProxy = await deployer.deployAsync(ContractName.TokenTransferProxy);
         const [rep, dgd, zrx] = await Promise.all([
-            deployer.deployAsync(ContractName.DummyToken),
-            deployer.deployAsync(ContractName.DummyToken),
-            deployer.deployAsync(ContractName.DummyToken),
+            deployer.deployAsync(ContractName.DummyToken, constants.DUMMY_TOKEN_ARGS),
+            deployer.deployAsync(ContractName.DummyToken, constants.DUMMY_TOKEN_ARGS),
+            deployer.deployAsync(ContractName.DummyToken, constants.DUMMY_TOKEN_ARGS),
         ]);
         const exchangeInstance = await deployer.deployAsync(ContractName.Exchange, [
             zrx.address,
diff --git a/packages/contracts/test/exchange/wrapper.ts b/packages/contracts/test/exchange/wrapper.ts
index 4ea40cb59..239f13a4f 100644
--- a/packages/contracts/test/exchange/wrapper.ts
+++ b/packages/contracts/test/exchange/wrapper.ts
@@ -56,9 +56,9 @@ describe('Exchange', () => {
         tokenOwner = accounts[0];
         [maker, taker, feeRecipient] = accounts;
         const [repInstance, dgdInstance, zrxInstance] = await Promise.all([
-            deployer.deployAsync(ContractName.DummyToken),
-            deployer.deployAsync(ContractName.DummyToken),
-            deployer.deployAsync(ContractName.DummyToken),
+            deployer.deployAsync(ContractName.DummyToken, constants.DUMMY_TOKEN_ARGS),
+            deployer.deployAsync(ContractName.DummyToken, constants.DUMMY_TOKEN_ARGS),
+            deployer.deployAsync(ContractName.DummyToken, constants.DUMMY_TOKEN_ARGS),
         ]);
         rep = new DummyTokenContract(web3Wrapper, repInstance.abi, repInstance.address);
         dgd = new DummyTokenContract(web3Wrapper, dgdInstance.abi, dgdInstance.address);
diff --git a/packages/contracts/test/token_transfer_proxy/transfer_from.ts b/packages/contracts/test/token_transfer_proxy/transfer_from.ts
index 6b86a0e97..a77590288 100644
--- a/packages/contracts/test/token_transfer_proxy/transfer_from.ts
+++ b/packages/contracts/test/token_transfer_proxy/transfer_from.ts
@@ -38,7 +38,7 @@ describe('TokenTransferProxy', () => {
             tokenTransferProxyInstance.abi,
             tokenTransferProxyInstance.address,
         );
-        const repInstance = await deployer.deployAsync(ContractName.DummyToken);
+        const repInstance = await deployer.deployAsync(ContractName.DummyToken, constants.DUMMY_TOKEN_ARGS);
         rep = new DummyTokenContract(web3Wrapper, repInstance.abi, repInstance.address);
 
         dmyBalances = new Balances([rep], [accounts[0], accounts[1]]);
diff --git a/packages/contracts/test/unlimited_allowance_token.ts b/packages/contracts/test/unlimited_allowance_token.ts
index 03eb581ad..553178d80 100644
--- a/packages/contracts/test/unlimited_allowance_token.ts
+++ b/packages/contracts/test/unlimited_allowance_token.ts
@@ -34,7 +34,7 @@ describe('UnlimitedAllowanceToken', () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         owner = accounts[0];
         spender = accounts[1];
-        const tokenInstance = await deployer.deployAsync(ContractName.DummyToken);
+        const tokenInstance = await deployer.deployAsync(ContractName.DummyToken, constants.DUMMY_TOKEN_ARGS);
         token = new DummyTokenContract(web3Wrapper, tokenInstance.abi, tokenInstance.address);
         await token.mint.sendTransactionAsync(MAX_MINT_VALUE, { from: owner });
         tokenAddress = token.address;
diff --git a/packages/contracts/util/constants.ts b/packages/contracts/util/constants.ts
index e61b2f802..9bb090a2a 100644
--- a/packages/contracts/util/constants.ts
+++ b/packages/contracts/util/constants.ts
@@ -1,3 +1,8 @@
+const DUMMY_TOKEN_NAME = '';
+const DUMMY_TOKEN_SYMBOL = '';
+const DUMMY_TOKEN_DECIMALS = 18;
+const DUMMY_TOKEN_TOTAL_SUPPLY = 0;
+
 export const constants = {
     NULL_BYTES: '0x',
     INVALID_OPCODE: 'invalid opcode',
@@ -6,4 +11,5 @@ export const constants = {
     MAX_ETHERTOKEN_WITHDRAW_GAS: 43000,
     MAX_TOKEN_TRANSFERFROM_GAS: 80000,
     MAX_TOKEN_APPROVE_GAS: 60000,
+    DUMMY_TOKEN_ARGS: [DUMMY_TOKEN_NAME, DUMMY_TOKEN_SYMBOL, DUMMY_TOKEN_DECIMALS, DUMMY_TOKEN_TOTAL_SUPPLY],
 };
diff --git a/packages/deployer/CHANGELOG.md b/packages/deployer/CHANGELOG.md
index a63d9cf3b..d8bbbbf89 100644
--- a/packages/deployer/CHANGELOG.md
+++ b/packages/deployer/CHANGELOG.md
@@ -2,7 +2,8 @@
 
 ## v0.2.0 - _TBD, 2018_
 
-    * Check dependencies when determining if contracts should be recompiled (#408).
+    * Check dependencies when determining if contracts should be recompiled (#408)
+    * Improve an error message for when deployer is supplied with an incorrect number of constructor arguments (#TBD)
 
 ## v0.1.0 - _February 16, 2018_
 
diff --git a/packages/deployer/src/deployer.ts b/packages/deployer/src/deployer.ts
index 6710bcc85..e87d2ab0e 100644
--- a/packages/deployer/src/deployer.ts
+++ b/packages/deployer/src/deployer.ts
@@ -1,4 +1,4 @@
-import { TxData } from '@0xproject/types';
+import { AbiType, TxData } from '@0xproject/types';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
@@ -49,6 +49,18 @@ export class Deployer {
             gas,
         };
         const abi = contractNetworkDataIfExists.abi;
+        const constructorAbi = _.find(abi, { type: AbiType.Constructor }) as Web3.ConstructorAbi;
+        const constructorArgs = _.isUndefined(constructorAbi) ? [] : constructorAbi.inputs;
+        if (constructorArgs.length !== args.length) {
+            const constructorSignature = `constructor(${_.map(constructorArgs, arg => `${arg.type} ${arg.name}`).join(
+                ', ',
+            )})`;
+            throw new Error(
+                `${contractName} expects ${constructorArgs.length} constructor params: ${constructorSignature}. Got ${
+                    args.length
+                }`,
+            );
+        }
         const web3ContractInstance = await this._deployFromAbiAsync(abi, args, txData);
         utils.consoleLog(`${contractName}.sol successfully deployed at ${web3ContractInstance.address}`);
         const contractInstance = new Contract(web3ContractInstance, this._defaults);