doctest_namespace fixture is not used depending on whether other tests run

[kratsg]

• a detailed description of the bug or problem you are having
• output of pip list from the virtual environment you are using
• pytest and operating system versions
• minimal example if possible

See #2379. Take the example there, which is already described as not functioning, but then add a new test file under tests called tests/test_helloworld.py and make a simple test like

def test_true():
  assert True

So the structure looks like

.
├── src
│   └── testpackage
│       └── __init__.py
└── tests
    └── conftest.py
    └── test_helloworld.py

Then the doctest_namespace fixture is picked up in the doctests and the issue is "fixed". This seems like somewhat inconsistent behavior when it comes to discovery and makes it really hard to debug. Is this expected behavior?

OS Details

$ pytest --version
pytest 7.2.1
$ uname -a
Darwin ghost.lan 22.1.0 Darwin Kernel Version 22.1.0: Sun Oct  9 20:14:54 PDT 2022; root:xnu-8792.41.9~2/RELEASE_X86_64 x86_64

[RonnyPfannschmidt]

The conftest only applies within its folder, the src folder is not within its folder

[kratsg]

The conftest only applies within its folder, the src folder is not within its folder

This is what is described on the other thread. But having a test under tests/ has src/__init__.py doctest passing because hello gets defined, even though it's in the conftest.py under tests/ only. I understand your explanation, but that's not the behavior I'm seeing in pytest.