Move tests folder

[yucongalicechen]

closes #98

[bobleesj]

@yucongalicechen

The CI fails because the installed package is unable to find example data.

Please add a line MANIFEST.in to import the test data as well.

From

recursive-exclude * __pycache__

to

recursive-include src/diffpy/labpdfproc/data *
recursive-exclude * __pycache__

[bobleesj]

So, to mimic the CI behavior, you can run pytest -vv after pip install . instead of pip install -e ..

If you use pip install ., you can confirm that the you are running the tests from the installed package located in miniconda3, etc.

[yucongalicechen]

thanks for the comment! @bobleesj

[bobleesj]

@yucongalicechen Just a quick heads up that we might do a quick re-cookiecutter for all diffpy projects we have all the issues addressed here: https://github.com/Billingegroup/cookiecutter/milestone/6

Since all the tests are running smoothly at the top directory level, it will be very easy!

[yucongalicechen]

I'm adding back labpdfproc command here because I notice it disappears again on our main branch, but I remembered adding it back in one of the previous PRs... not sure what happened.
@sbillinge I think this PR is ready for review, thanks!

[sbillinge]

It looks good. We should be able to delete init.py from the tests folder. Please can you delete that and see if everything still passes?

Then I think it is ready, it looks good.

[yucongalicechen]

Deleted! :)