Should tests live in directory test or tests? The guide seems inconsistent to me, but I'm new to contemporary Python packaging, so I may have missed something.

It is test in guides/using-manifest-in.rst:

How files are included in an sdist

The following files are included in a source distribution by default:

• ...
• all files matching the pattern test/test*.py

and tests in tutorials/packaging-projects.rst:

Creating a test directory

tests/ is a placeholder for test files. Leave it empty for now.

Is tests always the expected name for the directory containing tests? Could/should the guide standardize on that?