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# Configure Jest To Run A Test Setup File

Jest can be configured to run a setup file before each test. This is useful for configuring your testing framework in a single place, rather than in each test file.

This setup file can be specified in `package.json` (or `jest.config.js`).

```javascript
// package.json
{
  // ...
  "jest": {
    "setupTestFrameworkScriptFile": "<rootDir>src/setupTests.js"
  }
}
```

The [`setupTestFrameworkScriptFile`](https://facebook.github.io/jest/docs/en/configuration.html#setuptestframeworkscriptfile-string) points to a test setup file at the specified location rooted at `<rootDir>` (the root of your project).

This kind of setup is helpful for something like [Enzyme](https://github.com/airbnb/enzyme/blob/master/docs/guides/jest.md) that needs to be configured with a specific adapter for use throughout your tests.