expectjs: improve some more
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expectjs.md
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expectjs.md
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title: expect.js
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category: JavaScript libraries
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layout: 2017/sheet
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updated: 2017-09-02
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weight: -1
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---
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### Expectations
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### Using
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```
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npm install --save-dev expect
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```
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{: .-setup}
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```js
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// using ES6 modules
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import expect, { createSpy, spyOn, isSpy } from 'expect'
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```
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```js
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// using CommonJS modules
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var expect = require('expect')
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var createSpy = expect.createSpy
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var spyOn = expect.spyOn
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var isSpy = expect.isSpy
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```
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Expect is a library for assertions in tests.
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See: [mjackson/expect](https://github.com/mjackson/expect)
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### Assertions
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```js
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expect(x).toBe(y)
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@ -41,18 +66,27 @@ Assertions can be chained.
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### Spies
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```js
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const video = {
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play: function () { ··· }
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}
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```
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{: .-setup}
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```js
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spy = expect.spyOn(video, 'play')
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```
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```js
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spy = expect.spyOn(...)
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.andCallThrough() /* pass through */
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spy = expect.spyOn(···)
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.andCallThrough() // pass through
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.andCall(fn)
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.andThrow(exception)
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.andReturn(value)
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```
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### Assertions on spies
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```js
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expect(spy.calls.length).toEqual(1)
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expect(spy.calls[0].context).toBe(video)
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