def stack(request):
"""Creating a Stack object"""
stack = Stack()
stack.push(10)
stack.push(30)
stack.push(40)
stack.push(20)
return stack
def test_stack_linked_list():
# initialize nodes and stack
node_1 = Node(2)
node_2 = Node(24)
node_3 = Node(-31)
node_4 = Node(0)
stack = StackLL()
# test push()
stack.push(node_1)
stack.push(node_2)
stack.push(node_3)
stack.push(node_4)
assert stack.to_string() == '0 -> -31 -> 24 -> 2 -> '
# test pop()
stack.pop()
stack.pop()
assert stack.to_string() == '24 -> 2 -> '
stack.pop()
stack.pop()
assert stack.to_string() == ''
stack.pop()
# test peek()
node_5 = Node(7)
node_6 = Node(-1)
stack.push(node_5)
stack.push(node_6)
assert stack.peek() == node_6
stack.pop()
stack.pop()
stack.pop()
assert stack.peek() == None
assert stack.to_string() == ''
# test is_empty()
assert stack.is_empty()
node_7 = Node(10)
stack.push(node_7)
assert not stack.is_empty()
# test nuke()
assert stack.to_string() == '10 -> '
stack.nuke()
assert stack.is_empty()
assert stack.to_string() == ''
def test_get_max_empty_stack():
stack = Stack()
assert not stack.get_max()
def test_stack_len_empty_stack():
stack = Stack()
assert 0 == stack.stack_len(stack.peek)
def test_get_peek_empty_stack():
stack = Stack()
assert not stack.get_peek()
def test_is_empty():
stack = Stack()
assert stack.is_empty()
def test_pop_last_item():
stack = Stack()
stack.push(1)
assert 1 == stack.pop()
def test_pop_from_empty_stack():
stack = Stack()
assert not stack.pop()