def test_remove_all_nodes(self):
# arrange
head = create_linked_list([0, 0, 0, 0, 0])
val = 0
# act
result = remove_val(head, val)
# assert
self.assertIsNone(result)
def test_no_node(self):
# arrange
head = None
val = 2
# act
result = remove_val(head, val)
# assert
self.assertIsNone(result)
def test_remove_start_nodes(self):
# arrange
head = create_linked_list([5, 5, 6, 9, 7])
val = 5
# act
result = remove_val(head, val)
result_as_array = create_array(result)
# assert
self.assertSequenceEqual([6, 9, 7], result_as_array)
def test_remove_end_nodes(self):
# arrange
head = create_linked_list([1, 2, 3, -1, -1, -1])
val = -1
# act
result = remove_val(head, val)
result_as_array = create_array(result)
# assert
self.assertSequenceEqual([1, 2, 3], result_as_array)
def test_remove_middle_node(self):
# arrange
head = create_linked_list([1, 2, 5, 2, 3, 2, 2, 1])
val = 2
# act
result = remove_val(head, val)
result_as_array = create_array(result)
# assert
self.assertSequenceEqual([1, 5, 3, 1], result_as_array)
def test_no_nodes_to_remove(self):
# arrange
head = create_linked_list([1, 2, 5, -3, 2, 10])
val = 4
# act
result = remove_val(head, val)
result_as_array = create_array(result)
# assert
self.assertSequenceEqual([1, 2, 5, -3, 2, 10], result_as_array)