fix tests for tx

test/transaction.js

@@ -1,10 +1,12 @@
-var Varint = require('../lib/varint');
-var Transaction = require('../lib/transaction');
-var Txin = require('../lib/txin');
-var Txout = require('../lib/txout');
+'use strict';
+
 var should = require('chai').should();
-var BufferReader = require('../lib/bufferreader');
-var BufferWriter = require('../lib/bufferwriter');
+var bitcore = require('..');
+var Varint = bitcore.Varint;
+var Transaction = bitcore.Transaction;
+var Txin = bitcore.Txin;
+var Txout = bitcore.Txout;
+var BufferReader = bitcore.BufferReader;
 
 describe('Transaction', function() {