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214 lines
11 KiB
Markdown
214 lines
11 KiB
Markdown
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[](https://travis-ci.org/jest-community/eslint-plugin-jest)
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[](https://greenkeeper.io/)
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<div align="center">
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<a href="https://eslint.org/">
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<img width="150" height="150" src="https://eslint.org/assets/img/logo.svg">
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</a>
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<a href="https://facebook.github.io/jest/">
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<img width="150" height="150" vspace="" hspace="25" src="https://jestjs.io/img/jest.png">
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</a>
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<h1>eslint-plugin-jest</h1>
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<p>ESLint plugin for Jest</p>
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</div>
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## Installation
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```
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$ yarn add --dev eslint eslint-plugin-jest
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```
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**Note:** If you installed ESLint globally then you must also install
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`eslint-plugin-jest` globally.
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## Usage
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Add `jest` to the plugins section of your `.eslintrc` configuration file. You
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can omit the `eslint-plugin-` prefix:
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```json
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{
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"plugins": ["jest"]
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}
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```
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Then configure the rules you want to use under the rules section.
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```json
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{
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"rules": {
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"jest/no-disabled-tests": "warn",
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"jest/no-focused-tests": "error",
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"jest/no-identical-title": "error",
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"jest/prefer-to-have-length": "warn",
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"jest/valid-expect": "error"
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}
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}
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```
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You can also whitelist the environment variables provided by Jest by doing:
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```json
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{
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"env": {
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"jest/globals": true
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}
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}
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```
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## Shareable configurations
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### Recommended
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This plugin exports a recommended configuration that enforces good testing
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practices.
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To enable this configuration use the `extends` property in your `.eslintrc`
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config file:
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```json
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{
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"extends": ["plugin:jest/recommended"]
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}
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```
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### Style
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This plugin also exports a configuration named `style`, which adds some
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stylistic rules, such as `prefer-to-be-null`, which enforces usage of `toBeNull`
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over `toBe(null)`.
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To enable this configuration use the `extends` property in your `.eslintrc`
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config file:
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```json
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{
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"extends": ["plugin:jest/style"]
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}
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```
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See
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[ESLint documentation](http://eslint.org/docs/user-guide/configuring#extending-configuration-files)
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for more information about extending configuration files.
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### All
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If you want to enable all rules instead of only some you can do so by adding the
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`all` configuration to your `.eslintrc` config file:
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```json
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{
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"extends": ["plugin:jest/all"]
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}
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```
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While the `recommended` and `style` configurations only change in major versions
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the `all` configuration may change in any release and is thus unsuited for
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installations requiring long-term consistency.
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## Rules
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| Rule | Description | Configurations | Fixable |
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| ------------------------------ | ----------------------------------------------------------------- | ---------------- | ------------------- |
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| [consistent-test-it][] | Enforce consistent test or it keyword | | ![fixable-green][] |
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| [expect-expect][] | Enforce assertion to be made in a test body | | |
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| [lowercase-name][] | Disallow capitalized test names | | ![fixable-green][] |
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| [no-alias-methods][] | Disallow alias methods | ![recommended][] | ![fixable-green][] |
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| [no-commented-out-tests][] | Disallow commented out tests | | |
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| [no-disabled-tests][] | Disallow disabled tests | ![recommended][] | |
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| [no-duplicate-hooks][] | Disallow duplicate hooks within a `describe` block | | |
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| [no-empty-title][] | Disallow empty titles | | |
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| [no-expect-resolves][] | Disallow using `expect().resolves` | | |
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| [no-export][] | Disallow export from test files | | |
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| [no-focused-tests][] | Disallow focused tests | ![recommended][] | |
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| [no-hooks][] | Disallow setup and teardown hooks | | |
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| [no-identical-title][] | Disallow identical titles | ![recommended][] | |
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| [no-if][] | Disallow conditional logic | | |
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| [no-jasmine-globals][] | Disallow Jasmine globals | ![recommended][] | ![fixable-yellow][] |
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| [no-jest-import][] | Disallow importing `jest` | ![recommended][] | |
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| [no-large-snapshots][] | Disallow large snapshots | | |
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| [no-mocks-import][] | Disallow manually importing from `__mocks__` | | |
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| [no-standalone-expect][] | Prevents `expect` statements outside of a `test` or `it` block | | |
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| [no-test-callback][] | Using a callback in asynchronous tests | | ![fixable-green][] |
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| [no-test-prefixes][] | Disallow using `f` & `x` prefixes to define focused/skipped tests | ![recommended][] | ![fixable-green][] |
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| [no-test-return-statement][] | Disallow explicitly returning from tests | | |
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| [no-truthy-falsy][] | Disallow using `toBeTruthy()` & `toBeFalsy()` | | |
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| [no-try-expect][] | Prevent `catch` assertions in tests | | |
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| [prefer-called-with][] | Suggest using `toBeCalledWith()` OR `toHaveBeenCalledWith()` | | |
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| [prefer-expect-assertions][] | Suggest using `expect.assertions()` OR `expect.hasAssertions()` | | |
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| [prefer-hooks-on-top][] | Suggest to have all hooks at top-level before tests | | |
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| [prefer-inline-snapshots][] | Suggest using `toMatchInlineSnapshot()` | | ![fixable-green][] |
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| [prefer-spy-on][] | Suggest using `jest.spyOn()` | | ![fixable-green][] |
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| [prefer-strict-equal][] | Suggest using `toStrictEqual()` | | ![fixable-green][] |
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| [prefer-to-be-null][] | Suggest using `toBeNull()` | ![style][] | ![fixable-green][] |
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| [prefer-to-be-undefined][] | Suggest using `toBeUndefined()` | ![style][] | ![fixable-green][] |
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| [prefer-to-contain][] | Suggest using `toContain()` | ![style][] | ![fixable-green][] |
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| [prefer-to-have-length][] | Suggest using `toHaveLength()` | ![style][] | ![fixable-green][] |
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| [prefer-todo][] | Suggest using `test.todo()` | | ![fixable-green][] |
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| [require-top-level-describe][] | Require a top-level `describe` block | | |
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| [require-tothrow-message][] | Require that `toThrow()` and `toThrowError` includes a message | | |
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| [valid-describe][] | Enforce valid `describe()` callback | ![recommended][] | |
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| [valid-expect-in-promise][] | Enforce having return statement when testing with promises | ![recommended][] | |
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| [valid-expect][] | Enforce valid `expect()` usage | ![recommended][] | |
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| [valid-title][] | Enforce valid titles for jest blocks | | |
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## Credit
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- [eslint-plugin-mocha](https://github.com/lo1tuma/eslint-plugin-mocha)
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- [eslint-plugin-jasmine](https://github.com/tlvince/eslint-plugin-jasmine)
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## Related Projects
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### eslint-plugin-jest-formatting
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This project aims to provide formatting rules (auto-fixable where possible) to
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ensure consistency and readability in jest test suites.
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https://github.com/dangreenisrael/eslint-plugin-jest-formatting
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[consistent-test-it]: docs/rules/consistent-test-it.md
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[expect-expect]: docs/rules/expect-expect.md
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[lowercase-name]: docs/rules/lowercase-name.md
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[no-alias-methods]: docs/rules/no-alias-methods.md
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[no-commented-out-tests]: docs/rules/no-commented-out-tests.md
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[no-disabled-tests]: docs/rules/no-disabled-tests.md
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[no-duplicate-hooks]: docs/rules/no-duplicate-hooks.md
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[no-empty-title]: docs/rules/no-empty-title.md
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[no-expect-resolves]: docs/rules/no-expect-resolves.md
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[no-export]: docs/rules/no-export.md
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[no-focused-tests]: docs/rules/no-focused-tests.md
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[no-hooks]: docs/rules/no-hooks.md
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[no-identical-title]: docs/rules/no-identical-title.md
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[no-if]: docs/rules/no-if.md
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[no-jasmine-globals]: docs/rules/no-jasmine-globals.md
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[no-jest-import]: docs/rules/no-jest-import.md
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[no-large-snapshots]: docs/rules/no-large-snapshots.md
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[no-mocks-import]: docs/rules/no-mocks-import.md
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[no-standalone-expect]: docs/rules/no-standalone-expect.md
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[no-test-callback]: docs/rules/no-test-callback.md
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[no-test-prefixes]: docs/rules/no-test-prefixes.md
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[no-test-return-statement]: docs/rules/no-test-return-statement.md
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[no-truthy-falsy]: docs/rules/no-truthy-falsy.md
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[no-try-expect]: docs/rules/no-try-expect.md
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[prefer-called-with]: docs/rules/prefer-called-with.md
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[prefer-expect-assertions]: docs/rules/prefer-expect-assertions.md
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[prefer-inline-snapshots]: docs/rules/prefer-inline-snapshots.md
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[prefer-hooks-on-top]: docs/rules/prefer-hooks-on-top.md
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[prefer-spy-on]: docs/rules/prefer-spy-on.md
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[prefer-strict-equal]: docs/rules/prefer-strict-equal.md
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[prefer-to-be-null]: docs/rules/prefer-to-be-null.md
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[prefer-to-be-undefined]: docs/rules/prefer-to-be-undefined.md
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[prefer-to-contain]: docs/rules/prefer-to-contain.md
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[prefer-to-have-length]: docs/rules/prefer-to-have-length.md
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[prefer-todo]: docs/rules/prefer-todo.md
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[require-top-level-describe]: docs/rules/require-top-level-describe.md
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[require-tothrow-message]: docs/rules/require-tothrow-message.md
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[valid-describe]: docs/rules/valid-describe.md
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[valid-expect-in-promise]: docs/rules/valid-expect-in-promise.md
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[valid-expect]: docs/rules/valid-expect.md
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[valid-title]: docs/rules/valid-title.md
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[fixable-green]: https://img.shields.io/badge/-fixable-green.svg
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[fixable-yellow]: https://img.shields.io/badge/-fixable-yellow.svg
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[recommended]: https://img.shields.io/badge/-recommended-lightgrey.svg
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[style]: https://img.shields.io/badge/-style-blue.svg
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