use stub.(obj,meth).callsFake(fn) as stub(obj, 'meth', fn) has been removed

Author: Moti Shani

article1.md

@@ -156,9 +156,10 @@ Now that `tax.calculate` has been created, we can stub it out with our pre-progr
 var sinon = require('sinon');
 var tax = require('./../../src/part1/tax');
 
+
 describe('getTax()', function() {
   beforeEach(function() {
-    sinon.stub(tax, 'calculate', function(subtotal, state, done) {
+    sinon.stub(tax, 'calculate').callsFake(function(subtotal, state, done) {
       setTimeout(function() {
         done({
           amount: 30

tests/part1/cart-summary-test.js

@@ -6,7 +6,7 @@ var tax = require('./../../src/part1/tax');
 
 describe('CartSummary', function() {
 	beforeEach(function() {
-		sinon.stub(tax, 'calculate', function(subtotal, state, done) {
+		sinon.stub(tax, 'calculate').callsFake(function(subtotal, state, done) {
 			setTimeout(function() {
 				done({
 					amount: 30