def _check___reversed__(self, test, expect):
        f = FrameSet(test)
        e = list(reversed(expect))
        r = reversed(f)
        m = u'reversed(FrameSet("{0}")) != {1}: got {2}'
        self.assertEqual(list(r), e, m.format(test, e, r))
        m = u'reversed(FrameSet("{0}")) returns {1}: got {2}'
        self.assertIsInstance(r, types.GeneratorType, m.format(test, types.GeneratorType, type(r)))
Create a new existing pivot model instance.
dataset/ETHPy150Open sqlboy/fileseq/test/run.py/TestFrameSet._check___reversed__--crossover with--dataset/ETHPy150Open sdispater/orator/orator/orm/relations/belongs_to_many.py/BelongsToMany.new_existing_pivot