Bring back chai-enzyme.

* Add `test-bundler.js`, which sets up chai/chai-enzyme, and requires all tests.

* Karma config: Only reference `test-bundler.js` instead of a glob.

* Webpack test config: Removed cheerio from externals
enzymejs/enzyme#47 (comment)

app/components/Img/Img.test.js

@@ -1,17 +1,17 @@
 import Img from './index';
 
-import expect from 'expect';
+import { expect } from 'chai';
 import { shallow } from 'enzyme';
 import React from 'react';
 
 describe('<Img />', () => {
   it('should render an <img> tag', () => {
     const renderedComponent = shallow(<Img src="test.png" alt="test" />);
-    expect(renderedComponent.find('img').length).toEqual(1);
+    expect(renderedComponent).to.have.tagName('img');
   });
 
   it('should have an alt attribute', () => {
     const renderedComponent = shallow(<Img src="test.png" alt="test" />);
-    expect(renderedComponent.prop('alt')).toEqual('test');
+    expect(renderedComponent).to.have.attr('alt', 'test');
   });
 });

package.json

@@ -27,12 +27,14 @@
     "babel-preset-react": "^6.3.13",
     "babel-preset-react-hmre": "^1.0.1",
     "babel-preset-stage-0": "6.3.13",
+    "chai": "^3.5.0",
+    "chai-enzyme": "^0.3.0",
     "chalk": "^1.1.1",
     "cheerio": "^0.19.0",
     "css-loader": "^0.23.1",
     "css-modules-require-hook": "^2.1.0",
     "cssnano": "^3.4.0",
-    "enzyme": "^1.4.0",
+    "enzyme": "^1.5.0",
     "eslint": "^1.10.3",
     "eslint-config-airbnb": "^3.1.0",
     "eslint-plugin-react": "^3.15.0",

webpack/karma.conf.js

@@ -13,11 +13,16 @@ module.exports = (config) => {
     singleRun: true,
 
     files: [
-      '../app/**/*.test.js'
+      {
+        pattern: `./test-bundler.js`,
+        watched: false,
+        served: true,
+        included: true
+      }
     ],
 
     preprocessors: {
-      ['../app/**/*.test.js']: ['webpack', 'sourcemap'],
+      ['./test-bundler.js']: ['webpack', 'sourcemap']
     },
 
     webpack: webpackConfig,

webpack/test-bundler.js

@@ -0,0 +1,13 @@
+import sinon from 'sinon';
+import chai from 'chai';
+import chaiEnzyme from 'chai-enzyme';
+
+chai.use(chaiEnzyme());
+
+global.chai = chai;
+global.sinon = sinon;
+global.expect = chai.expect;
+global.should = chai.should();
+
+const testsContext = require.context('../app', true, /\.test\.js$/);
+testsContext.keys().forEach(testsContext);

webpack/webpack.test.babel.js

@@ -37,7 +37,6 @@ module.exports = {
   // required for enzyme to work properly
   externals: {
     jsdom: 'window',
-    cheerio: 'window',
     'react/lib/ExecutionEnvironment': true,
     'react/lib/ReactContext': 'window'
   },