Remove 'react-test-renderer' and snapshot tests – not compatible with…

… 'react-dom' loaded by 'enzyme'.

See facebook/react#7386 for more info

package.json

@@ -36,7 +36,6 @@
     "ncp": "^2.0.0",
     "pre-commit": "^1.1.3",
     "react-addons-test-utils": "^15.3.2",
-    "react-test-renderer": "^15.3.2",
     "webpack": "^1.13.2",
     "webpack-dev-server": "^1.16.1"
   },

src/components/App/App.spec.js

@@ -1,19 +1,18 @@
 /* eslint-env jest */
 
 import React from 'react';
-import renderer from 'react-test-renderer';
+import { shallow } from 'enzyme';
 
 import { App } from './App';
 
 describe('<App />', () => {
-  describe('Snapshots', () => {
-    it('should render as expected', () => {
-      const component = renderer.create(<App />);
-      const tree = component.toJSON();
+  describe('Shallow Rendering', () => {
+    it('should render an <h1>', () => {
+      const wrapper = shallow(<App />);
 
       expect(
-        tree
-      ).toMatchSnapshot();
+        wrapper.contains(<h1>Hello, world</h1>)
+      ).toBeTruthy();
     });
   });
 });