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Suggest jest-enzyme for simplifying test matchers #994

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Feb 11, 2017
Merged

Suggest jest-enzyme for simplifying test matchers #994

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Suggest jest-enzyme for simplifying test matchers
blainekasten Oct 31, 2016
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Update README.md
blainekasten Dec 12, 2016
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Update README.md
blainekasten Dec 12, 2016
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14 changes: 14 additions & 0 deletions packages/react-scripts/template/README.md
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Expand Up @@ -741,6 +741,20 @@ it('renders welcome message', () => {
All Jest matchers are [extensively documented here](http://facebook.github.io/jest/docs/api.html#expect-value).<br>
Nevertheless you can use a third-party assertion library like [Chai](http://chaijs.com/) if you want to, as described below.

Additionally, you might find [jest-enzyme](https://github.com/blainekasten/enzyme-matchers) helpful to simplify your tests with readable matchers. The above `contains` code can be written simpler with jest-enzyme.

```js
expect(wrapper).toContainReact(welcome)
```

To setup jest-enzyme with Create React App, follow the instructions for [initializing your test environment](#initializing-test-environment) to import `jest-enzyme`.

```js
// src/setupTests.js
import 'jest-enzyme';
```


### Using Third Party Assertion Libraries

We recommend that you use `expect()` for assertions and `jest.fn()` for spies. If you are having issues with them please [file those against Jest](https://github.com/facebook/jest/issues/new), and we’ll fix them. We intend to keep making them better for React, supporting, for example, [pretty-printing React elements as JSX](https://github.com/facebook/jest/pull/1566).
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