Ignore class name pattern

[JamshedVesuna]

It would be great to have an ignore_python_classes configuration pattern in conjunction with python_classes. This is especially useful when using private base test classes:

class _BaseTest():

    def test_something(self):
        assert self.var == 1  # self.var only exists in child classes.
        ...

class TestSomething(_BaseTest):
    var = 3
    # Run test_something with self.var = 3.
    ...

I couldn't find an existing issue or question about this. Is there a better way of doing this than setting an ignore pattern of _Base*?

[nicoddemus]

pytest by default will only search for classes with the Test prefix. Running your own example:

============================= test session starts =============================
collected 1 items

foo.py::TestSomething::test_something FAILED

================================== FAILURES ===================================
________________________ TestSomething.test_something _________________________

self = <foo.TestSomething instance at 0x00000000038B9888>

    def test_something(self):
>       assert self.var == 1  # self.var only exists in child classes.
E       assert 3 == 1
E        +  where 3 = <foo.TestSomething instance at 0x00000000038B9888>.var

foo.py:4: AssertionError
========================== 1 failed in 0.03 seconds ===========================

You will notice it only collected TestSomething. Can you post a complete example of the problem you are having?

[JamshedVesuna]

More specifically, I am switching from using nosetests to pytest, and have some _Base test classes that inherit from unittest.TestCase. These are getting picked up by pytest and pytest --collect-only. Would make the transition much faster if I could just explicitly ignore these test classes. Or, is there an alternative solution here?

[The-Compiler]

I think setting __test__ = False in those classes should prevent them from being picked up - can you try that?

In the long run, those should probably be converted parametrized plain tests though 😉

[nicoddemus]

I think setting test = False in those classes should prevent them from being picked up - can you try that?

Also you will need to set __test__ = True on the subclasses.

[JamshedVesuna]

Darn, this might be a lot of overhead. Is there a plan to add ignore_python_classes to the config setup? Is this a reasonable PR request?

[nicoddemus]

I guess so... it would have to be implemented by the unittest plugin. But that's a new feature, so it will be available in 3.1.0 only, and that might take a awhile to be released.

[JamshedVesuna]

Thanks for the information and quick response! Going to close this out for now.

[nicoddemus]

No problem, glad to help!