def test_update(self):
od1 = OrderedDict()
for i in range(10):
od1[i] = 100 * i
keys1 = od1.keys()
od2 = OrderedDict()
for i in range(10, 20):
od2[i] = 100 * i
od1.update(od2)
for index, check in zip(od1.keys(), range(20)):
self.assertEqual(index, check)
od1._keyorder = keys1
od1.update(0, od2)
for index, check in zip(od1.keys(), range(10, 20) + range(10)):
self.assertEqual(index, check)
self.assertRaises(TypeError, od1.update, 0, od1, 1)
