def test_are_cousins_same_value(self):
# arrange
tree = create_tree_from_list([1, 2, 3, 4, None, 5, 6])
# act
result = are_cousins(tree, 2, 2)
# assert
self.assertFalse(result)
def test_are_cousins_true(self):
# arrange
tree = create_tree_from_list([1, 2, 3, 4, None, 5, None, 6, 7, 8, 9])
# act
result = are_cousins(tree, 6, 9)
# assert
self.assertTrue(result)
def test_are_cousins_same_parents(self):
# arrange
tree = create_tree_from_list([1, 2, 3])
# act
result = are_cousins(tree, 2, 3)
# assert
self.assertFalse(result)
def test_are_cousins_y_first(self):
# arrange
tree = create_tree_from_list([1, 2, 3, 4, None, None, 5])
# act
result = are_cousins(tree, 5, 2)
# assert
self.assertFalse(result)