py.test skips test class if constructor is defined

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The documentation for py.test says that py.test implements the following standard test discovery:

  • collection starts from the initial command line arguments which may be directories, filenames or test ids.
    recurse into directories, unless they match norecursedirs
  • test_*.py or *_test.py files, imported by their package name.
  • Test prefixed test classes (without an __init__ method) [<– notice this one here]
  • test_ prefixed test functions or methods are test items

So it’s not that the constructor isn’t needed, py.test just ignores classes that have a constructor. There is also a guide for changing the standard test discovery.

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