Move web3 import after subprovider imports in test web3_factory

packages/0x.js/test/utils/web3_factory.ts

@@ -3,7 +3,6 @@
 // we are not running in a browser env.
 // Filed issue: https://github.com/ethereum/web3.js/issues/844
 (global as any).XMLHttpRequest = undefined;
-import * as Web3 from 'web3';
 import ProviderEngine = require('web3-provider-engine');
 import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
 
@@ -12,6 +11,13 @@ import {FakeGasEstimateSubprovider} from './subproviders/fake_gas_estimate_subpr
 
 import {constants} from './constants';
 
+// HACK: web3 leaks XMLHttpRequest into the global scope and causes requests to hang
+// because they are using the wrong XHR package.
+// importing web3 after subproviders fixes this issue
+// Filed issue: https://github.com/ethereum/web3.js/issues/844
+// tslint:disable-next-line:ordered-imports
+import * as Web3 from 'web3';
+
 export const web3Factory = {
     create(hasAddresses: boolean = true): Web3 {
         const provider = this.getRpcProvider(hasAddresses);