[TIP] Inheritance of TestClasses?

Dan Stromberg drsalists at gmail.com
Tue Sep 3 14:05:07 PDT 2019

Hi folks.

I'm still working on converting that large codebase from unittest to pytest
(in parallel with a couple of other projects).

I was able to get past the runTest issue I was seeing, with the great help
on this list.  It turned out to be because we were using unittest.TestCase
      runner = unittest.TextTestRunner(verbosity=3)

      result = runner.run(test_suite)

Now I have a new question: Does pytest allow one test class to inherit from

I'm asking, because our unittest test cases use inheritance a lot.  With
our somewhat strange use of runTest, this was working well enough, but with
pytest it appears to be a problem.

Specifically, we have lots of things like:
      def setup_method(self):

          super(TestFeatures, self).setup_method()

And we -had- a lot of:
      def __init__(self):
          super(TestFeatures, self).__init__()
...but I eliminated those by merging them into setup_method().  I did this
because pytest apparently skips any test class that has an __init__ method.

However, now from our many setup_method's I'm getting things like:
>       super(FeatureElasticSearchAwareTestCase, self).setup_method()
E       AttributeError: 'super' object has no attribute 'setup_method'

And I chased up the inheritance hierarchy, and found that every super class
but object itself has a .setup_method().  This is a 2.x and 3.x codebase,
so that's why it cares about object.

So I ask: does pytest eliminate the possilbity of using an inheritance
hierarchy in the test code? Or is this another oddity of the codebase I'm
working on?

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