Update docs/community/contributing-emulators.md

Co-authored-by: Sophie Arana <[email protected]>

docs/community/contributing-emulators.md

@@ -46,7 +46,7 @@ We use two types of tests:
 
 1. **Scikit-learn Test Suite**: Add your emulator to `tests/test_estimators.py` to verify scikit-learn compatibility. Not all tests need to pass - use `_more_tags()` to skip incompatible tests. See the [estimator tags overview](https://scikit-learn.org/1.5/developers/develop.html#estimator-tags) for details.
 
-2. **Custom Tests**: Add specific tests for your emulator in `tests/models/` to verify its core functionality.
+2. **Custom Tests**: Add specific tests for your emulator in `tests/models/` to verify its core functionality (e.g., confirming output shapes, validating end-to-end functionality of components such as parameter search etc).
 
 ## Registering an emulator