def test_pop_from_front(self):
test_list = DoublyLinkedList()
test_list.insert_front(5)
test_list.insert_front(7)
test_list.insert_front(9)
front_pop = test_list.pop_front()
node = test_list.pop_front()
self.assertEqual(
7, node._node_value,
"First item isn't the second item before pop from front")
def test_first_item(self):
test_list = DoublyLinkedList()
test_list.insert_front(5)
test_list.insert_front(9)
pop = test_list.pop_front()
self.assertEqual(9, pop, "first item did not insert correctly")
def test_pop_front(self):
#Arrange
double_linked = DoublyLinkedList()
double_linked.insert_front(1)
double_linked.insert_front(2)
double_linked.insert_front(3)
#Act
double_linked.pop_front()
#Assert
self.assertEqual(2, double_linked.first_node.value,
"pop_front did not return the correct node value")
self.assertEqual(None, double_linked.first_node.prev_node,
"pop_front did not return the correct node value")