Added mocking example. Refs #18

README.md

@@ -79,12 +79,13 @@ export default class Menu extends Component {
 ###Writing tests:
 
 ```js
-// Filename: __tests__/Menu-test.js
+// Filename: __tests__/Menu-test.jsx
 
 'use strict';
 
 import React from 'react/addons';
 import Menu from '../Menu.jsx';
+import { expect } from 'chai';
 
 let { TestUtils } = React.addons;
 
@@ -104,6 +105,7 @@ describe('Menu', () => {
     expect(menuElem.querySelectorAll('li').length).to.equal(2);
   });
 });
+
 ```
 
 ## Sass, CSS & webpack

app/components/Menu/Menu.jsx

@@ -1,7 +1,6 @@
-// Filename: Menu.jsx
-
 import './_Menu.scss';
 import React from 'react';
+import MenuItem from './MenuItem';
 
 let { Component, PropTypes } = React;
 
@@ -15,20 +14,12 @@ export default class Menu extends Component {
     items: PropTypes.array.isRequired
   };
 
-  state = {
-    foo: false
-  }
-
-  renderItem(item) {
-    return (
-      <li key={'menu-item-' + item.id}>{item.label}</li>
-    );
-  }
-
   render() {
     return (
       <ul className={'menu'}>
-        {this.props.items.map(this.renderItem, this)}
+        {this.props.items.map((item) => {
+          return (<MenuItem item={item} />);
+        }, this)}
       </ul>
     );
   }

app/components/Menu/MenuItem.jsx

@@ -0,0 +1,16 @@
+import React from 'react';
+
+let { Component, PropTypes } = React;
+
+export default class MenuItem extends Component {
+
+  static propTypes = {
+    item: PropTypes.object.isRequired
+  };
+
+  render() {
+    return (
+      <li key={'menu-item-' + this.props.item.id}>{this.props.item.label}</li>
+    );
+  }
+}

app/components/Menu/__tests__/Menu-test.jsx

@@ -0,0 +1,42 @@
+import React from 'react/addons';
+import { expect } from 'chai';
+
+import Menu from '../Menu.jsx';
+import MenuItem from '../MenuItem.jsx';
+
+// Here we create a mocked MenuItem component.
+class MockedMenuItem extends MenuItem {
+  render() {
+    return (
+      <li className={'mocked-menu-item'}>{this.props.item.label}</li>
+    );
+  }
+}
+
+// Here we set the mocked MenuItem component.
+Menu.__Rewire__('MenuItem', MockedMenuItem);
+
+describe('Menu', () => {
+
+  let { TestUtils } = React.addons;
+
+  let menuItems = [
+    { id: 1, label: 'Option 1' },
+    { id: 2, label: 'Option 2' }
+  ];
+
+  let menu = TestUtils.renderIntoDocument(
+    <Menu items={menuItems} />
+  );
+  let menuElem = React.findDOMNode(menu);
+
+  it('Should render the menu items', () => {
+    expect(menuElem.querySelectorAll('li').length).to.equal(2);
+    expect(menuElem.querySelectorAll('li')[0].textContent.trim()).to.equal(menuItems[0].label);
+    expect(menuElem.querySelectorAll('li')[1].textContent.trim()).to.equal(menuItems[1].label);
+  });
+
+  it('Should render the mocked menu item', () => {
+    expect(menuElem.querySelectorAll('li')[0].className).to.equal('mocked-menu-item');
+  });
+});

package.json

@@ -32,9 +32,10 @@
   },
   "devDependencies": {
     "autoprefixer-core": "^5.2.1",
-    "babel-core": "^5.6.15",
+    "babel-core": "^5.8.3",
     "babel-eslint": "^3.1.23",
     "babel-loader": "^5.3.1",
+    "babel-plugin-rewire": "^0.1.8",
     "babel-runtime": "^5.6.15",
     "chai": "^3.0.0",
     "css-loader": "^0.15.2",
@@ -108,6 +109,7 @@
         2,
         "single"
       ],
+      "no-underscore-dangle": 0,
       "react/display-name": 0,
       "react/jsx-quotes": 1,
       "react/jsx-no-undef": 1,
@@ -118,7 +120,7 @@
       "react/no-did-update-set-state": 1,
       "react/no-multi-comp": 1,
       "react/no-unknown-property": 1,
-      "react/prop-types": 1,
+      "react/prop-types": 0,
       "react/react-in-jsx-scope": 1,
       "react/self-closing-comp": 1,
       "react/wrap-multilines": 1

webpack/loaders.js

@@ -32,7 +32,7 @@ if (DEBUG || TEST) {
   if (!TEST) {
     jsxLoader.push('react-hot');
   }
-  jsxLoader.push('babel-loader?optional[]=runtime&stage=0');
+  jsxLoader.push('babel-loader?optional[]=runtime&stage=0&plugins=rewire');
   sassParams.push('sourceMap', 'sourceMapContents=true');
   sassLoader = [
     'style-loader',
@@ -46,7 +46,7 @@ if (DEBUG || TEST) {
     'postcss-loader'
   ].join('!');
 } else {
-  jsxLoader = ['babel-loader?optional[]=runtime&stage=0'];
+  jsxLoader = ['babel-loader?optional[]=runtime&stage=0&plugins=rewire'];
   sassLoader = ExtractTextPlugin.extract('style-loader', [
     'css-loader',
     'postcss-loader',