>
> Keep in mind that you need to tell tox to cd into tests/ before running
> pytest, otherwise you’re testing the source directory instead of the
> installed package.
>
> https://tox.readthedocs.io/en/latest/config.html#confval-changedir=path
> <https://tox.readthedocs.io/en/latest/config.html#confval-changedir=path>
>
> I'm running the tests on the source directory using `python -m pytest' with
> tox. Pytest collects all tests and runs it on the source, and all imports in
> the test files are like 'from docwriter import ...' so I think this is the
> right configuration. Am I missing something?
> (https://travis-ci.com/nikramakrishnan/freetype-docwriter/jobs/136998196#L445
> <https://travis-ci.com/nikramakrishnan/freetype-docwriter/jobs/136998196#L445>)
>
This is a bit tricky in Python, see
https://blog.ionelmc.ro/2014/05/25/python-packaging/#the-structure
<https://blog.ionelmc.ro/2014/05/25/python-packaging/#the-structure>.
Basically, tox and therefore pytest is run from the project root directory,
which happens to have the docwriter module-directory. Python by default has the
current directory in the import path. pytest will collect the tests and run
them — when they import docwriter, they will actually import the
module-directory in the project root! You however want to test the package as
installed by tox somewhere in .tox/…. Stepping out of the root directory, e.g.
into the tests directory ensures this.
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