Add code comment for documenting the tests.

# Add code comment for documenting the tests.

I think adding a code comment to the test suite is a good idea for code readability and I think this will benefit a lot more people in this regard. If this is something that is acceptable to the project I can contribute this to the existing tests.

The issue does not name a test file, suite, or entry point. First locate the existing tests that need documentation and confirm the project's expectations for test comments; done means the agreed comments are added without changing test behavior.

Written by the indexing model from the issue text.