When using both --doctest-modules and --import-mode=importlib with pytest, it imports the same class as two different classes.
You can see the id() of the class imported in test_google_workspace.py is 140177692791520 and in google_workspace.py it is 140177692783968 - and then the assertion fails because the two Event classes are actually different.
Remove either of the above pytest options from pyproject.toml and tests pass.
$ poetry run pytest -s
============================= test session starts ==============================
platform darwin -- Python 3.10.7, pytest-7.1.3, pluggy-1.0.0
rootdir: /Users/aw/Projects/cureatr/dev/cureatr/experiments/pytest-importlib-bug, configfile: pyproject.toml
collecting ... /Users/aw/Projects/cureatr/dev/cureatr/experiments/pytest-importlib-bug/pybug/google_workspace.py 140177692783968
/Users/aw/Projects/cureatr/dev/cureatr/experiments/pytest-importlib-bug/pybug/tests/test_google_workspace.py 140177692791520
/Users/aw/Projects/cureatr/dev/cureatr/experiments/pytest-importlib-bug/pybug/tests/test_google_workspace.py 140177692791520
collected 2 items
pybug/integration.py .
pybug/tests/test_google_workspace.py F
=================================== FAILURES ===================================
___________________________________ test_it ____________________________________
> ???
E AssertionError: assert <class 'pybug.integration.Event'> is Event
E + where <class 'pybug.integration.Event'> = getclass()
/Users/aw/Projects/cureatr/dev/cureatr/experiments/pybug/pybug/tests/test_google_workspace.py:9: AssertionError
=========================== short test summary info ============================
FAILED pybug/tests/test_google_workspace.py::test_it - AssertionError: assert...
========================= 1 failed, 1 passed in 0.07s ==========================Also running the test in isolation passes:
$ poetry run pytest -s pybug/tests/test_google_workspace.py
============================= test session starts ==============================
platform darwin -- Python 3.10.7, pytest-7.1.3, pluggy-1.0.0
rootdir: /Users/aw/Projects/cureatr/dev/cureatr/experiments/pytest-importlib-bug, configfile: pyproject.toml
collecting ... /Users/aw/Projects/cureatr/dev/cureatr/experiments/pytest-importlib-bug/pybug/google_workspace.py 140551538264096
/Users/aw/Projects/cureatr/dev/cureatr/experiments/pytest-importlib-bug/pybug/tests/test_google_workspace.py 140551538264096
/Users/aw/Projects/cureatr/dev/cureatr/experiments/pytest-importlib-bug/pybug/tests/test_google_workspace.py 140551538264096
collected 1 item
pybug/tests/test_google_workspace.py .
============================== 1 passed in 0.02s ===============================