In a project I work on, we organize tests under a tests folder. Within that
folder, of course, we have several levels of sub-folders. Recently I had a
problem where some newer tests weren't being run with our build. It turns out
that nosetests only recurses into subfolders that are modules. Thus, to fix
the problem, I had to add an empty __init__.py file to the subfolder that
contained the tests that weren't being run.
To prevent this from happening again, I added the following little meta-test to our test suite:
import os
import unittest
class TestEnsureAllTestFoldersAreModules(unittest.TestCase):
def test_ensure_all_test_folders_are_modules(self):
# nosetests won't run tests in folders that don't have an __init__.py
# file, so make sure that all the sub-folders under tests/, recursively,
# have an __init__.py file. Only check folders that contain a test_*.py
# file as some folders like __pycache__ don't contain actual tests.
for root, dirs, files in os.walk('tests'):
if any([f.startswith('test_') and f.endswith(".py") for f in files]):
self.assertTrue(
'__init__.py' in files,
'{} does not have an __init__.py file'.format(root)
)