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59 lines
1.6 KiB
Markdown
59 lines
1.6 KiB
Markdown
<h1 align="center">
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<img src="https://jestjs.io/img/jest.png" height="150" width="150"/>
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<img src="https://jestjs.io/img/circus.png" height="150" width="150"/>
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<p align="center">jest-circus</p>
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<p align="center">The next-gen test runner for Jest</p>
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</h1>
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## Overview
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Circus is a flux-based test runner for Jest that is fast, easy to maintain, and simple to extend.
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Circus allows you to bind to events via an optional event handler on any [custom environment](https://jestjs.io/docs/en/configuration#testenvironment-string). See the [type definitions](https://github.com/facebook/jest/blob/master/packages/jest-circus/src/types.ts) for more information on the events and state data currently available.
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```js
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import {NodeEnvironment} from 'jest-environment-node';
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import {Event, State} from 'jest-circus';
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class MyCustomEnvironment extends NodeEnvironment {
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//...
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handleTestEvent(event: Event, state: State) {
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if (event.name === 'test_start') {
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// ...
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}
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}
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}
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```
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Mutating event or state data is currently unsupported and may cause unexpected behavior or break in a future release without warning. New events, event data, and/or state data will not be considered a breaking change and may be added in any minor release.
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## Installation
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Install `jest-circus` using yarn:
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```bash
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yarn add --dev jest-circus
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```
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Or via npm:
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```bash
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npm install --save-dev jest-circus
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```
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## Configure
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Configure Jest to use `jest-circus` via the [`testRunner`](https://jestjs.io/docs/en/configuration#testrunner-string) option:
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```json
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{
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"testRunner": "jest-circus/runner"
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}
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```
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Or via CLI:
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```bash
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jest --testRunner='jest-circus/runner'
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```
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