No longer shipping the tests with the numpy wheels uploaded to PyPI was discussed in gh-25737. This is now possible after gh-26274. Here are some questions about how we want to go about this. My assumption is that we want to do this in a fairly non-disruptive way, meaning no moving of all tests files (that would yield a ton of merge conflicts on all open PRs).

I think these will be the next steps in a follow-up PR to gh-26274:

• Drop the tests label from the default set of install tags in pyproject.toml or modify our cibuildwheel config to do that (this needs deciding)
• Start producing an installable test suite (numpy-tests wheels).
  • Decision 2: do we want that to land in-tree inside a numpy install, or out-of-tree (e.g. in a separate numpy-tests directory)? The latter seems cleaner, but may require some more tweaks to test structure (e.g., import numpy._core._multiarray_tests needs modifying).
• Tweak our CI for wheel building to make everything work again.
• Ensure that python -c "import numpy; numpy.test()" gives a clear error message when the tests are not installed
• Add docs for distro packagers and others who want to run the tests.

Thoughts?