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42 lines
1.0 KiB
Markdown
42 lines
1.0 KiB
Markdown
# Require a message for `toThrow()` (`require-to-throw-message`)
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<!-- end auto-generated rule header -->
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`toThrow()` (and its alias `toThrowError()`) is used to check if an error is
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thrown by a function call, such as in `expect(() => a()).toThrow()`. However, if
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no message is defined, then the test will pass for any thrown error. Requiring a
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message ensures that the intended error is thrown.
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## Rule details
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This rule triggers a warning if `toThrow()` or `toThrowError()` is used without
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an error message.
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The following patterns are considered warnings:
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```js
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test('all the things', async () => {
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expect(() => a()).toThrow();
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expect(() => a()).toThrowError();
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await expect(a()).rejects.toThrow();
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await expect(a()).rejects.toThrowError();
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});
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```
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The following patterns are not considered warnings:
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```js
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test('all the things', async () => {
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expect(() => a()).toThrow('a');
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expect(() => a()).toThrowError('a');
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await expect(a()).rejects.toThrow('a');
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await expect(a()).rejects.toThrowError('a');
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});
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```
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