def CoopTestCase(other_base_class):
  """Returns a new base class with a cooperative metaclass base.

  This enables the TestCase to be used in combination
  with other base classes that have custom metaclasses, such as
  mox.MoxTestBase.

  Only works with metaclasses that do not override type.__new__.

  Example:

    import google3
    import mox

    from google3.testing.pybase import parameterized

    class ExampleTest(parameterized.CoopTestCase(mox.MoxTestBase)):
      ...

  Args:
    other_base_class: (class) A test case base class.

  Returns:
    A new class object.
  """
  metaclass = type(
      'CoopMetaclass',
      (other_base_class.__metaclass__,
       TestGeneratorMetaclass), {})
  return metaclass(
      'CoopTestCase',
      (other_base_class, TestCase), {})
Returns a new base class with a cooperative metaclass base.

  This enables the TestCase to be used in combination
  with other base classes that have custom metaclasses, such as
  mox.MoxTestBase.

  Only works with metaclasses that do not override type.__new__.

  Example:

    import google3
    import mox

    from google3.testing.pybase import parameterized

    class ExampleTest(parameterized.CoopTestCase(mox.MoxTestBase)):
      ...

  Args:
    other_base_class: (class) A test case base class.

  Returns:
    A new class object.
  
deps/protobuf/python/google/protobuf/internal/_parameterized.py