def tests(self):
self.assertEqual(puredict.puredict(), puredict.empty())
e = puredict.empty().insert(2,4).insert(6,4).insert(2,5).delete(6)
self.assertEqual(len(frozenset((e))),1)
self.assertEqual(len(e), 1)
self.assertIn(2, e)
self.assertNotIn(6, e)
self.assertRaises(KeyError, e.__getitem__, 6)
def test_constructor_empty(self):
e = puredict.puredict()
self.assertEqual(e, puredict.empty())
