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33 lines
898 B
Markdown
33 lines
898 B
Markdown
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# Disallow using `toBeTruthy()` & `toBeFalsy()` (no-truthy-falsy)
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Tests against boolean values should assert true or false. Asserting `toBeTruthy`
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or `toBeFalsy` matches non-boolean values as well and encourages weaker tests.
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For example, `expect(someBoolean).toBeFalsy()` passes when
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`someBoolean === null`, and when `someBoolean === false`.
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Similarly, `expect(someBoolean).toBeTruthy()` passes when `someBoolean === []`,
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and when `someBoolean === 'false'` (note that `'false'` is a string).
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## Rule details
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This rule triggers a warning if `toBeTruthy()` or `toBeFalsy()` are used.
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This rule is disabled by default.
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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(someValue).toBeTruthy();
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expect(someValue).toBeFalsy();
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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(someValue).toBe(true);
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expect(someValue).toBe(false);
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```
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