Merge pull request #199 from DorianGrey/master

Adjust 'Testing components' section to use the correct TS versions.

Author: DorianGrey

packages/react-scripts/template/README.md

@@ -1244,9 +1244,9 @@ There is a broad spectrum of component testing techniques. They range from a “
 
 Different projects choose different testing tradeoffs based on how often components change, and how much logic they contain. If you haven’t decided on a testing strategy yet, we recommend that you start with creating simple smoke tests for your components:
 
-```js
-import React from 'react';
-import ReactDOM from 'react-dom';
+```ts
+import * as React from 'react';
+import * asReactDOM from 'react-dom';
 import App from './App';
 
 it('renders without crashing', () => {
@@ -1255,26 +1255,34 @@ it('renders without crashing', () => {
 });
 ```
 
-This test mounts a component and makes sure that it didn’t throw during rendering. Tests like this provide a lot value with very little effort so they are great as a starting point, and this is the test you will find in `src/App.test.js`.
+This test mounts a component and makes sure that it didn’t throw during rendering. Tests like this provide a lot value with very little effort so they are great as a starting point, and this is the test you will find in `src/App.test.tsx`.
 
 When you encounter bugs caused by changing components, you will gain a deeper insight into which parts of them are worth testing in your application. This might be a good time to introduce more specific tests asserting specific expected output or behavior.
 
 If you’d like to test components in isolation from the child components they render, we recommend using [`shallow()` rendering API](http://airbnb.io/enzyme/docs/api/shallow.html) from [Enzyme](http://airbnb.io/enzyme/). To install it, run:
 
 ```sh
-npm install --save enzyme react-test-renderer
+npm install --save enzyme @types/enzyme enzyme-adapter-react-16 @types/enzyme-adapter-react-16 react-test-renderer @types/react-test-renderer
 ```
 
 Alternatively you may use `yarn`:
 
 ```sh
-yarn add enzyme react-test-renderer
+yarn add enzyme @types/enzyme enzyme-adapter-react-16 @types/enzyme-adapter-react-16 react-test-renderer @types/react-test-renderer
+```
+
+#### `src/setupTests.ts`
+```ts
+import * as Enzyme from 'enzyme';
+import * as Adapter from 'enzyme-adapter-react-16';
+
+Enzyme.configure({ adapter: new Adapter() });
 ```
 
 You can write a smoke test with it too:
 
-```js
-import React from 'react';
+```ts
+import * as React from 'react';
 import { shallow } from 'enzyme';
 import App from './App';
 
@@ -1289,8 +1297,8 @@ You can read the [Enzyme documentation](http://airbnb.io/enzyme/) for more testi
 
 Here is an example from Enzyme documentation that asserts specific output, rewritten to use Jest matchers:
 
-```js
-import React from 'react';
+```ts
+import * as React from 'react';
 import { shallow } from 'enzyme';
 import App from './App';
 
@@ -1323,7 +1331,7 @@ Alternatively you may use `yarn`:
 yarn add jest-enzyme
 ```
 
-Import it in [`src/setupTests.js`](#initializing-test-environment) to make its matchers available in every test:
+Import it in [`src/setupTests.ts`](#initializing-test-environment) to make its matchers available in every test:
 
 ```js
 import 'jest-enzyme';
@@ -1346,12 +1354,12 @@ and then use them in your tests like you normally do.
 
 >Note: this feature is available with `react-scripts@0.4.0` and higher.
 
-If your app uses a browser API that you need to mock in your tests or if you just need a global setup before running your tests, add a `src/setupTests.js` to your project. It will be automatically executed before running your tests.
+If your app uses a browser API that you need to mock in your tests or if you just need a global setup before running your tests, add a `src/setupTests.ts` to your project. It will be automatically executed before running your tests.
 
 For example:
 
-#### `src/setupTests.js`
-```js
+#### `src/setupTests.ts`
+```ts
 const localStorageMock = {
   getItem: jest.fn(),
   setItem: jest.fn(),