fixes OpenZeppelin#1205

Author: Aniket-Engg

test/helpers/chai.js

@@ -0,0 +1,10 @@
+const chai = require('chai');
+
+module.exports = {
+  shouldWithBignumber: function (bignumber) {
+    return chai.use(require('chai-bignumber')(bignumber)).should();
+  },
+  shouldOnly: function () {
+    return require('chai').should();
+  },
+};

test/helpers/expectEvent.js

@@ -1,7 +1,5 @@
 const BigNumber = web3.BigNumber;
-const should = require('chai')
-  .use(require('chai-bignumber')(BigNumber))
-  .should();
+const should = require('./chai').shouldWithBignumber();
 
 function inLogs (logs, eventName, eventArgs = {}) {
   const event = logs.find(function (e) {

test/helpers/shouldFail.js

@@ -1,5 +1,4 @@
-const should = require('chai')
-  .should();
+const should = require('./chai').shouldOnly();
 
 async function shouldFailWithMessage (promise, message) {
   try {

test/ownership/Ownable.behavior.js

@@ -2,9 +2,6 @@ const shouldFail = require('../helpers/shouldFail');
 const expectEvent = require('../helpers/expectEvent');
 const { ZERO_ADDRESS } = require('../helpers/constants');
 
-require('chai')
-  .should();
-
 function shouldBehaveLikeOwnable (owner, [anyone]) {
   describe('as an ownable', function () {
     it('should have an owner', async function () {

test/payment/PaymentSplitter.test.js

@@ -4,12 +4,6 @@ const { sendEther } = require('./../helpers/sendTransaction');
 const { ether } = require('../helpers/ether');
 const { ZERO_ADDRESS } = require('./../helpers/constants');
 
-const BigNumber = web3.BigNumber;
-
-require('chai')
-  .use(require('chai-bignumber')(BigNumber))
-  .should();
-
 const shouldFail = require('../helpers/shouldFail');
 const PaymentSplitter = artifacts.require('PaymentSplitter');