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62 lines
1.7 KiB
Markdown
62 lines
1.7 KiB
Markdown
# Disallow specific matchers & modifiers (`no-restricted-matchers`)
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<!-- end auto-generated rule header -->
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You may want to ban specific matchers & modifiers from being used.
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## Rule details
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This rule bans specific matchers & modifiers from being used, and can suggest
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alternatives.
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## Options
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Bans are expressed in the form of a map, with the value being either a string
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message to be shown, or `null` if the default rule message should be used.
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Bans are checked against the start of the `expect` chain - this means that to
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ban a specific matcher entirely you must specify all six permutations, but
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allows you to ban modifiers as well.
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By default, this map is empty, meaning no matchers or modifiers are banned.
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For example:
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```json
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{
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"jest/no-restricted-matchers": [
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"error",
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{
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"toBeFalsy": null,
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"resolves": "Use `expect(await promise)` instead.",
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"toHaveBeenCalledWith": null,
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"not.toHaveBeenCalledWith": null,
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"resolves.toHaveBeenCalledWith": null,
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"rejects.toHaveBeenCalledWith": null,
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"resolves.not.toHaveBeenCalledWith": null,
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"rejects.not.toHaveBeenCalledWith": null
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}
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]
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}
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```
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Examples of **incorrect** code for this rule with the above configuration
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```js
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it('is false', () => {
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// if this has a modifer (i.e. `not.toBeFalsy`), it would be considered fine
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expect(a).toBeFalsy();
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});
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it('resolves', async () => {
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// all uses of this modifier are disallowed, regardless of matcher
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await expect(myPromise()).resolves.toBe(true);
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});
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describe('when an error happens', () => {
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it('does not upload the file', async () => {
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// all uses of this matcher are disallowed
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expect(uploadFileMock).not.toHaveBeenCalledWith('file.name');
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});
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});
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```
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