def test_set_is_hashable(self):
s = FrozenOrderedSet(['a', 'b', 'c'])
hash(s)
def test_init_from_sequence(self):
s = FrozenOrderedSet([5, 2, 4, 0, 9, 13, 5, 3])
self.assertEqual(list(s), [5, 2, 4, 0, 9, 13, 3])
def test_set_length(self):
s = FrozenOrderedSet([1, 2, 3])
self.assertEqual(len(s), 3)
def test_init_from_empty(self):
s = FrozenOrderedSet()
self.assertEqual(list(s), [])