@0x/contracts-exchange: Fix broken tests.

`@0x/contracts-test-utils`: Remove unecessary wait timeout in
`LogDecoder`.

contracts/exchange/test/transactions.ts

@@ -1,6 +1,6 @@
 // tslint:disable: max-file-line-count
 import { ERC20ProxyContract, ERC20Wrapper } from '@0x/contracts-asset-proxy';
-import { DummyERC20TokenContract } from '@0x/contracts-erc20';
+import { artifacts as erc20Artifacts, DummyERC20TokenContract } from '@0x/contracts-erc20';
 import {
     blockchainTests,
     constants,
@@ -25,7 +25,7 @@ import * as ethUtil from 'ethereumjs-util';
 import * as _ from 'lodash';
 
 import {
-    artifacts,
+    artifacts as localArtifacts,
     constants as exchangeConstants,
     ExchangeCancelEventArgs,
     ExchangeCancelUpToEventArgs,
@@ -40,6 +40,8 @@ import {
     WhitelistContract,
 } from '../src/';
 
+const artifacts = { ...erc20Artifacts, ...localArtifacts };
+
 // tslint:disable:no-unnecessary-type-assertion
 blockchainTests.resets('Exchange transactions', env => {
     let chainId: number;

contracts/test-utils/src/log_decoder.ts

@@ -45,10 +45,7 @@ export class LogDecoder {
         return logWithDecodedArgsOrLog;
     }
     public async getTxWithDecodedLogsAsync(txHash: string): Promise<TransactionReceiptWithDecodedLogs> {
-        const receipt = await this._web3Wrapper.awaitTransactionSuccessAsync(
-            txHash,
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
+        const receipt = await this._web3Wrapper.awaitTransactionSuccessAsync(txHash);
         return this.decodeReceiptLogs(receipt);
     }
     public decodeReceiptLogs(receipt: TransactionReceipt): TransactionReceiptWithDecodedLogs {