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45 lines
862 B
45 lines
862 B
# Suggest using `toContain()` (`prefer-to-contain`) |
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In order to have a better failure message, `toContain()` should be used upon |
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asserting expectations on an array containing an object. |
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## Rule details |
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This rule triggers a warning if `toBe()`, `toEqual()` or `toStrictEqual()` is |
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used to assert object inclusion in an array |
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```js |
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expect(a.includes(b)).toBe(true); |
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``` |
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```js |
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expect(a.includes(b)).not.toBe(true); |
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``` |
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```js |
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expect(a.includes(b)).toBe(false); |
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``` |
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### Default configuration |
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The following patterns are considered warnings: |
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```js |
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expect(a.includes(b)).toBe(true); |
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expect(a.includes(b)).not.toBe(true); |
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expect(a.includes(b)).toBe(false); |
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expect(a.includes(b)).toEqual(true); |
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expect(a.includes(b)).toStrictEqual(true); |
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``` |
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The following patterns are not considered warnings: |
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```js |
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expect(a).toContain(b); |
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expect(a).not.toContain(b); |
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```
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