When I run tests for my python project by running the following command:
python setup.py test (or) pytest project_name
I get the following error:
.../project_name/.eggs/pytest_asyncio-0.9.0-py3.6.egg/pytest_asyncio/plugin.py", line 8, in <module> from _pytest.python import transfer_markers ImportError: cannot import name 'transfer_markers'
When I looked it up online, there was almost no mention of that particular error message anywhere. Something similar has happened to me a few times before where previously working code just breaks and it's usually because there's a new version of an important package.
I looked at the pytest release history, and it looks like
pytest==4.1.0 has been released a few hours ago (as of this post).
The solution is to revert back to the last stable version of pytest i.e.
pytest==4.0.2 by running the following command:
pip install pytest==4.0.2
The tests are running now.