30 lines
551 B
Markdown
30 lines
551 B
Markdown
---
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title: expect.js
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---
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```js
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expect(x).toBe(y)
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.toBe(val)
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.toEqual(val)
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.toThrow(err)
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.toExist
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.toBeA(constructor)
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.toBeA('string')
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.toMatch(/expr/)
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.toBeLessThan(n)
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.toBeGreaterThan(n)
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.toInclude(val)
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.toExclude(val)
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```
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```js
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spy = expect.spyOn(video, 'play')
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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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expect(spy.calls[0].arguments).toEqual([ 'some', 'args' ]);
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expect(spy).toHaveBeenCalled();
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expect(spy).toHaveBeenCalledWith('some', 'args');
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```
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https://www.npmjs.com/package/expect
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