| # turbopack-ecmascript | |
| ## Adding new parser tests | |
| We use a snapshot-based testing system to ensure that changes to the parser don't break existing code. | |
| To add a new test, you need to create a new directory in `tests/analyzer/graph` with an 'input.js' file | |
| inside. | |
| The snapshot tests are done with the `testing` crate. You can update them by passing the env var | |
| `UPDATE=1` to the test runner. | |
| ```sh | |
| UPDATE=1 cargo test -p turbopack-ecmascript | |
| ``` | |