# Core Testing

## Directory

| Directory                                     | Description                                                                                   |
| --------------------------------------------- | --------------------------------------------------------------------------------------------- |
| [Preview Changes](./preview-changes.md)       | Steps on building core and previewing changes                                                 |
| [Usage Instructions](./usage-instructions.md) | How to run tests and update screenshots                                                       |
| [Best Practices](./best-practices.md)         | Contains information on conventions to follow as well as pitfalls to avoid when writing tests |
| [API](./api.md)                               | Documents the custom functionality that has been built on top of Playwright                   |