'Empty sets can be hashed and result in different hashes than empty
strings or the string \'NULLSET\'.'

def test_empty_sets_can_be_hashed(self):

    self.assertThat(generation_hash(frozenset()), Not(Equals(generation_hash(''))))
    self.assertThat(generation_hash(frozenset()), Not(Equals(generation_hash('NULLSET'))))
