def test_default_factory(self):
d = KeyTransformDict(transform=abs, default_factory=list)
d[2].append(4)
d[-2].append(5)
self.assertIn(-2, d)
self.assertEqual(d[2], [4, 5])
self.assertEqual(list(d.items()), [(2, [4, 5])])
def test_len(self):
d = KeyTransformDict(transform=abs)
self.assertEqual(len(d), 0)
d[13] = 2
self.assertEqual(len(d), 1)
d[-14] = 5
self.assertEqual(len(d), 2)
d[-13] = 3
self.assertEqual(len(d), 2)
result = d.pop(13)
self.assertEqual(result, 3)
self.assertEqual(len(d), 1)
del d[14]
self.assertEqual(len(d), 0)
