Test setup helper added (#1482)

* signing prefix added

* Minor improvement

* Tests changed

* Successfully tested

* Minor improvements

* Minor improvements

* Revert "Dangling commas are now required. (#1359)"

This reverts commit a6889776f4.

* updates

* fixes #1404

* approve failing test

* suggested changes done

* ISafeERC20 removed

* conflict fixes

* fixes #1205

* minor change

* suggested changes

* reviewed changes

* final update

test/token/ERC721/ERC721.behavior.js

@@ -5,11 +5,7 @@ const { ZERO_ADDRESS } = require('../../helpers/constants');
 const send = require('../../helpers/send');
 
 const ERC721ReceiverMock = artifacts.require('ERC721ReceiverMock.sol');
-const BigNumber = web3.BigNumber;
-
-require('chai')
-  .use(require('chai-bignumber')(BigNumber))
-  .should();
+require('../../helpers/setup');
 
 function shouldBehaveLikeERC721 (
   creator,