jest-runner-groups

jest-runner-groups

A test runner that allows you to tag your tests and execute specific groups of tests with Jest.

Instalation

npm i -D jest-runner-groups

Usage

To use this runner you need to tag your tests, add this runner to your jest config and update your test command to specify which groups to run.

Tag your tests

To properly tag your tests, you need to add a docblock with the @group tag to every test file you have. For example, your test should look like the following to belong to the unit/classes/foo group:

/**
 * Tests Foo class
 * 
 * @group unit/classes/foo
 */

import Foo from '../src/Foo';

describe( 'Foo class', () => {
    it( '...', () => {
        ...
    } );

    ...
} );

Your tests may have multiple groups per file:

/**
 * Admin dashboard tests
 * 
 * @group admin/pages/dashboard
 * @group puppeteer
 * @group acceptance
 */

describe( 'Dashboard page', () => {
    ...
} );

Update Jest config

To make Jest use this runner, you need to update your Jest config and add groups runner to it. For example, if your jest config is in the package.json file:

{
    "name": "my-package",
    "version": "1.0.0",
    "dependencies": {
    },
    "jest": {
        "runner": "groups"
    }
}

Or in the jest.config.js file:

module.exports = {
    ...
    runner: "groups"
};

Note: There is a confusion between runner and testRunner options in the jest configuration. The main difference between them is that jest uses runner to find and execute all tests, and testRunner to execute a particular test file. So, if you want to use jest-circus, then add it as testRunner along with "runner": "groups" option and they will work together.

Run groups of tests

Once you update your tests and jest config, you can start running tests in groups by using --group argument. Just specify a group or groups that you want to run like this:

// using jest executable:
jest --group=unit

// or via npm:
npm test -- --group=unit

You can use multiple --group arguments to specify multiple groups to run:

npm test -- --group=unit/classes --group=unit/services

Also pay attention that if you specify a prefix of a group, then all tests that have a group that starts with that prefix will be executed. In other words, if you run npm test -- --group=unit command, then all tests that have a group that starts with unit will be executed.

Exclude groups

If you want to exclude a subgroup from being executed, add minus character to the beginnig of its name. The following example shows how to run all tests in the foo group, but exclude foo/baz group:

jest --group=foo --group=-foo/baz

Knowing which gruops are running

When you run your tests using jest-runner-groups, you can check which group is currently running by checking the current process environment variables. This can be handy if you want to use different fixtures for different groups or skip a certain functionality for a specific group.

Each group is added with the JEST_GROUP_ prefix and all non-word characters in the group name are replaced with underscores. For example, if you run the following command:

npm test -- --group=unit/classes --group=unit/services

Then you can check groups in your jest tests:

/**
 * Admin dashboard tests
 * 
 * @group unit/classes
 * @group unit/services
 * @group unit/utility
 */

it( '...', () => {
    expect( process.env.JEST_GROUP_UNIT_CLASSES ).toBeTruthy();
    expect( process.env.JEST_GROUP_UNIT_SERVICES ).toBeTruthy();
    expect( process.env.JEST_GROUP_UNIT_UTILITY ).not.toBeTruthy();
} );

Contribute

Want to help or have a suggestion? Open a new ticket and we can discuss it or submit a pull request.

License

MIT

Changelog

[v2.2.0] (2022-03-28)

• Added information about the currently running groups to environment variables.
• Updated dependencies to the latest versions.