mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-24 09:25:15 +00:00
62 lines
2.2 KiB
Markdown
62 lines
2.2 KiB
Markdown
|
<h1 align="center">
|
||
|
|
<img src="https://jestjs.io/img/jest.png" height="150" width="150"/>
|
||
|
|
<img src="https://jestjs.io/img/circus.png" height="150" width="150"/>
|
||
|
|
<p align="center">jest-circus</p>
|
||
|
|
<p align="center">The next-gen test runner for Jest</p>
|
||
|
|
</h1>
|
||
|
|
|
||
|
|
## Overview
|
||
|
|
|
||
|
|
Circus is a flux-based test runner for Jest that is fast, maintainable, and simple to extend.
|
||
|
|
|
||
|
|
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.
|
||
|
|
|
||
|
|
```js
|
||
|
|
import NodeEnvironment from 'jest-environment-node';
|
||
|
|
import {Event, State} from 'jest-circus';
|
||
|
|
|
||
|
|
class MyCustomEnvironment extends NodeEnvironment {
|
||
|
|
//...
|
||
|
|
|
||
|
|
async handleTestEvent(event: Event, state: State) {
|
||
|
|
if (event.name === 'test_start') {
|
||
|
|
// ...
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
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.
|
||
|
|
|
||
|
|
Note, that `jest-circus` test runner would pause until a promise returned from `handleTestEvent` gets fulfilled. **However, there are a few events that do not conform to this rule, namely**: `start_describe_definition`, `finish_describe_definition`, `add_hook`, `add_test` or `error` (for the up-to-date list you can look at [SyncEvent type in the types definitions](https://github.com/facebook/jest/tree/master/packages/jest-types/src/Circus.ts)). That is caused by backward compatibility reasons and `process.on('unhandledRejection', callback)` signature, but that usually should not be a problem for most of the use cases.
|
||
|
|
|
||
|
|
## Installation
|
||
|
|
|
||
|
|
Install `jest-circus` using yarn:
|
||
|
|
|
||
|
|
```bash
|
||
|
|
yarn add --dev jest-circus
|
||
|
|
```
|
||
|
|
|
||
|
|
Or via npm:
|
||
|
|
|
||
|
|
```bash
|
||
|
|
npm install --save-dev jest-circus
|
||
|
|
```
|
||
|
|
|
||
|
|
## Configure
|
||
|
|
|
||
|
|
Configure Jest to use `jest-circus` via the [`testRunner`](https://jestjs.io/docs/en/configuration#testrunner-string) option:
|
||
|
|
|
||
|
|
```json
|
||
|
|
{
|
||
|
|
"testRunner": "jest-circus/runner"
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
Or via CLI:
|
||
|
|
|
||
|
|
```bash
|
||
|
|
jest --testRunner='jest-circus/runner'
|
||
|
|
```
|