Support for tests dir in subdirectory

[aceberle]

Looking at the code, hammett expects tests to be located in a "test" or "tests" directory located at the project root or located within the module directory (I'm guessing alongside the actual files that they test).

My project is set up like this:

root/
├─ src/
│  ├─ my_module/
│  │  ├─ __init__.py
│  │  ├─ my_app.py
│  ├─ tests/
│  │  ├─ __init__.py
│  │  ├─ test_my_app.py
setup.cfg
requirements.txt

Pytest is able to run fine when I set "testpaths=lib/tests", but I have not been able to configure hammett to run tests properly.

I tried this configuration which actually picked up the test classes, but then hammett couldn't figure out where my module was:

[hammett]
modules=src
source_location=.

It resulted in ModuleNotFoundError: No module named 'my_module'

It feels like I should be able to do this and it should work, but it doesn't find my tests:

[hammett]
modules=my_module
source_location=src

That just gives me the No module to test found. You might need to add... message.

Looking at the code, this might be fixed by simply adding a couple more lines to the collect_files method to also check for "test" or "tests" directories under the source_location path at this location:

https://github.com/boxed/hammett/blob/0cd47f8bdd779a2a9f036c1bfba558c3120a0c5c/hammett/init.py#L315-L321

[aceberle]

Messing around with it locally, it looks like there is still a problem with loading my_module from my test classes with hammett even if I get the test classes to get picked up.

When hammett tries to load the test module on the following line, it fails with ModuleNotFoundError: No module named 'my_module': https://github.com/boxed/hammett/blob/0cd47f8bdd779a2a9f036c1bfba558c3120a0c5c/hammett/init.py#L598-L610

The module_name value passed-in here looks kind of weird: src.tests.test_my_app. I don't think the src part should be included, but if I remove it (using the debugger), I still get the same error as before.

[boxed]

Hmm.. Yea I guess there are some issues with that type of folder structure. I personally never have a src folder. In my opinion it just causes trouble as you have to fiddle with the python path and stuff to make it work.

I am open to a PR if you figure this out.