def test_add_by_key_to_empty(self):
"""Test adding multiple items to an empty bimap by key."""
bimap = BiMap()
bimap.update_by_key({1: "first", 2: "second"})
self.assertEqual(2, len(bimap))
self.assertEqual("first", bimap.get_key(1))
self.assertEqual(2, bimap.get_value("second"))
def test_add_to_nonempty(self):
"""Test adding multiple items to nonempty bimap."""
bimap = BiMap({1: "first", 2: "second"})
bimap.update_by_value({"third": 3, "fourth": 4})
bimap.update_by_key({2: "secondNew", 3: "thirdNew"})
self.assertEqual(4, len(bimap))
self.assertEqual("first", bimap.get_key(1))
self.assertEqual("secondNew", bimap.get_key(2))
self.assertEqual(3, bimap.get_value("thirdNew"))
self.assertEqual(4, bimap.get_value("fourth"))