eslint-plugin-jest

ESLint plugin for Jest

$ yarn add --dev eslint eslint-plugin-jest

Note: If you installed ESLint globally then you must also install eslint-plugin-jest globally.

Add jest to the plugins section of your .eslintrc configuration file. You can omit the eslint-plugin- prefix:

{
  "plugins": ["jest"]
}

Then configure the rules you want to use under the rules section.

{
  "rules": {
    "jest/no-disabled-tests": "warn",
    "jest/no-focused-tests": "error",
    "jest/no-identical-title": "error",
    "jest/prefer-to-have-length": "warn",
    "jest/valid-expect": "error"
  }
}

You can also whitelist the environment variables provided by Jest by doing:

{
  "env": {
    "jest/globals": true
  }
}

• no-disabled-tests - disallow disabled tests.
• no-focused-tests - disallow focused tests.
• no-identical-title - disallow identical titles.
• prefer-to-have-length - suggest using toHaveLength().
• valid-expect - ensure expect is called correctly.

This plugin exports a recommended configuration that enforces good testing practices.

To enable this configuration use the extends property in your .eslintrc config file:

{
  "extends": ["plugin:jest/recommended"]
}

See ESLint documentation for more information about extending configuration files.

The rules enabled in this configuration are:

• jest/no-disabled-tests
• jest/no-focused-tests
• jest/no-identical-title
• jest/prefer-to-have-length
• jest/valid-expect

• eslint-plugin-mocha
• eslint-plugin-jasmine