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# @automattic/calypso-jest
This package provides a Jest preset used to run tests in Calypso. In your `jest.config.js` set the following:
```js
module.exports = {
preset: '@automattic/calypso-jest',
};
```
Major features:
- Find tests under `<rootDir>` inside `test` folder. Valid extensions are `.ts`, `.js`, `.tsx`, `.jsx`
- Can use `calypso:src` from `package.json` to resolve a package
- Can use conditional exports
## Assets transformer
Jest would fail when trying to import asset files that it cannot parse,
i.e. they're not plain JavaScript:
```jsx
const MyFlag = ( { countryCode } ) => (
<img alt="" src={ require( `flags/${ countryCode }.svg` ).default } />
);
```
This packages includes a transfomer that be used to transform all those imports to a module that returns
the asset file's basename as a string:
```js
const config = {
transform: {
'\\.(gif|jpg|jpeg|png|svg|scss|sass|css)$': require.resolve(
'@automattic/calypso-jest/asset-transform.js'
),
},
};
```
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