# Jest Preset Default
Default [Jest](https://jestjs.io/) preset for WordPress development.
## Installation
Install the module
```bash
npm install @wordpress/jest-preset-default --save-dev
```
## Setup
### Via `jest.config.json` or `jest` field in `package.json`
```json
{
"preset": "@wordpress/jest-preset-default"
}
```
### Usage
#### Brief explanations of options included
* `moduleNameMapper` - all `css` and `scss` files containing CSS styles will be stubbed out.
* `modulePaths` - the root dir of the project is used as a location to search when resolving modules.
* `setupFiles` - runs code before each test which sets up global variables required in the testing environment.
* `setupFilesAfterEnv` - runs code which adds improved support for `Console` object and `React` components to the testing framework before each test.
* `snapshotSerializers` - makes it possible to use snapshot tests on `Enzyme` wrappers.
* `testMatch`- includes `/test/` subfolder in addition to the glob patterns Jest uses to detect test files. It detects only test files containing `.js` (or `.ts`) suffix. It doesn't match files with `.spec.js` suffix.
* `timers` - use of [fake timers](https://jestjs.io/docs/en/timer-mocks.html) for functions such as `setTimeout` is enabled.
* `transform` - keeps the default [babel-jest](https://github.com/facebook/jest/tree/master/packages/babel-jest) transformer.
* `verbose` - each individual test won't be reported during the run.
