def test_peek_node_value_at_top_of_stack():
new_stack = Stack()
new_stack.push(5)
new_stack.push(6)
new_stack.peek()
actual = new_stack.peek()
expected = 6
assert actual == expected
def initial_stack():
initial_stack = Stack()
initial_stack.push("a")
initial_stack.push("b")
initial_stack.push("c")
initial_stack.push("d")
return initial_stack
def test_node_top_value_afetr_pop():
new_stack = Stack()
new_stack.push(5)
new_stack.push(6)
new_stack.pop()
actual = new_stack.top.value
expected = 5
assert actual == expected
def __init__(self):
self.stack1 = Stack()
self.stack2 = Stack()
class PseudoQueue:
def __init__(self):
self.stack1 = Stack()
self.stack2 = Stack()
def enqueue(self, value):
self.stack1.push(value)
def dequeue(self):
if self.stack1.isEmpty():
raise Exception("PseudoQue is empty")
while not self.stack1.isEmpty():
popped = self.stack1.pop()
self.stack2.push(popped)
dequed = self.stack2.pop()
while not self.stack2.isEmpty():
popped = self.stack2.pop()
self.stack1.push(popped)
return dequed
def isEmpty(self):
return self.stack1.isEmpty()
def test_check_empty_stack():
new_stack = Stack()
actual = new_stack.isEmpty()
expected = True
assert actual == expected
def test_push_value():
new_stack = Stack()
new_stack.push(5)
actual = new_stack.top.value
expected = 5
assert actual == expected
def test_new_stack():
new_stack = Stack()
assert new_stack
def test_seven_peek():
initial_stack = Stack()
with pytest.raises(Exception):
initial_stack.peek()
def test_one():
initial_stack = Stack()
initial_stack.push("a")
actual = initial_stack.top.value
expected = "a"
assert actual == expected
def test_six():
initial_stack = Stack()
actual = initial_stack.top
expected = None
assert actual == expected