'Override and implement this classmethod to register resources that
should be created and/or torn down on a per-class basis.
Subclass implementations of this should always invoke this with super()
to ensure that fixture mixins work properly.'

@classmethod
def init_class_fixtures(cls):

    if cls._in_setup:
        raise ValueError('Called    init_class_fixtures    from    init_instance_fixtures.Did    you    write    super(...,    self).init_class_fixtures()    instead    of    super(...,    self).init_instance_fixtures()?')
    cls._base_init_fixtures_was_called = True
