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45 lines
862 B
Markdown
45 lines
862 B
Markdown
# 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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