Plugin causes invalid output

Hi, thanks for the awesome idea. I have found several issues using this project.

But, I have faced an issue in one of my projects.

How it is now

I am 100% sure that I don’t have any duplicates or unused fixtures. Link to tests: https://github.com/wemake-services/wemake-django-template/blob/master/tests/test_project_generation.py That’s exactly what this plugin reports. But it does report something really strange:

============================= test session starts ==============================
platform linux -- Python 3.6.5, pytest-3.5.1, py-1.5.3, pluggy-0.6.0
rootdir: /home/travis/build/wemake-services/wemake-django-template, inifile: setup.cfg
plugins: isort-0.1.0, flake8-1.0.0, deadfixtures-2.0.0, cookies-0.3.0
collected 16 items                                                             
Cool, every declared fixture is being used.
You may have some duplicate fixtures:
========================= no tests ran in 0.02 seconds =========================
The command "pipenv run python -m pytest" exited with 0.

What does it mean? Are tests executed? Why You may have some duplicate fixtures label is shown without any items?

Link to the build: https://travis-ci.org/wemake-services/wemake-django-template/builds/371985278

How it should be

============================= test session starts ==============================
platform linux -- Python 3.6.5, pytest-3.5.1, py-1.5.3, pluggy-0.6.0
rootdir: /home/travis/build/wemake-services/wemake-django-template, inifile: setup.cfg
plugins: isort-0.1.0, flake8-1.0.0, deadfixtures-2.0.0, cookies-0.3.0
collected 16 items                                                             
Cool, every declared fixture is being used.
You don't have any duplicate fixtures.

....
========================= 4 tests ran in 0.02 seconds =========================
The command "pipenv run python -m pytest" exited with 0.

Offtopic

Are you interested in creating “Projects using it” section? I would be happy to submit https://github.com/wemake-services/wemake-django-template

[jllorencetti]

I believe this would be a different issue. 🤔 I’ll need to take a look at pytest code to see what/why is causing the collected count to diverge and see if I can do something about it in the plugin.

[sobolevn]

@jllorencetti tests count is still invalid.

Plugin version: deadfixtures-2.0.1 Collected: 16 tests Run: 0 Link: https://travis-ci.org/wemake-services/wemake-django-template/jobs/372351652#L565

Should we reopen this one? Or create a new issue?