def test_common(self):
self.assertEqual(funcs.common(self.tree_str, "Hazel", "Gloria"), "Clare")
self.assertEqual(funcs.common(self.tree_str, "Hazel", "Clare"), "Clare")
self.assertEqual(funcs.common(self.tree_str, "Hazel", "Flora"), "Ann")
self.assertEqual(funcs.common(self.tree_str, "Hazel", "Betty"), "Ann")
self.assertEqual(funcs.common(self.tree_str, "Hazel", "Ann"), "Ann")
self.assertEqual(funcs.common(self.tree_str, "Hazel", "Hazel"), "Hazel")
def test_common2(self):
self.assertEqual(funcs.common(self.tree_str2, "Norma", "Paula"), "Tina")
