def test_size(self):
dll = Dll()
size = dll.size_dll()
# Test an empty Linked List
assert size == 0
# Test Linked List with some nodes
dll.add_at_head(1)
dll.add_at_head(2)
dll.add_at_head(3)
dll.add_at_head(4)
size = dll.size_dll()
assert size == 4
def test_add_at_tail(self):
dll = Dll()
dll.add_at_head("apple")
dll.add_at_head("orange")
dll.add_at_tail("mango")
assert str(dll.head) == "orange"
assert dll.size_dll() == 3
def test_add_at_nth_position(self):
dll = Dll()
dll.add_at_head(1)
dll.add_at_head(2)
dll.add_at_head(3)
dll.add_at_head(4)
dll.add_at_nth_position(5, 0)
size = dll.size_dll()
assert size == 5