def test_Stack_pop_multiple_items():
my_stack = Stack()
my_stack.push(1)
my_stack.push(2)
my_stack.push(3)
my_stack.pop()
actual = my_stack.pop()
expected = 2
assert actual == expected
def test_Stack_isEmpty_not_empty():
my_stack = Stack()
my_stack.push(1)
my_stack.push(2)
my_stack.push(3)
actual = my_stack.is_empty()
expected = False
assert actual == expected
def test_Stack_peek_top():
my_stack = Stack()
my_stack.push(1)
my_stack.push(2)
my_stack.push(3)
actual = my_stack.peek()
expected = 3
assert actual == expected
def test_Stack_pop_one_item():
my_stack = Stack()
my_stack.push(1)
my_stack.push(2)
my_stack.push(3)
actual = my_stack.pop()
expected = 3
assert actual == expected
def test_Stack_push_multiple_items():
my_stack = Stack()
my_stack.push(1)
my_stack.push(2)
my_stack.push(3)
actual = my_stack.peek()
expected = 3
assert actual == expected
def test_Stack_isEmpty_empty():
my_stack = Stack()
actual = my_stack.is_empty()
expected = True
assert actual == expected
def test_Stack_peek_empty_Exception():
with pytest.raises(AttributeError):
my_stack = Stack()
actual = my_stack.peek()
expected = "Can't peek top from an empty stack"
assert actual == expected
def test_Stack_push_one_item():
my_stack = Stack()
my_stack.push(1)
actual = my_stack.peek()
expected = 1
assert actual == expected
def test_Stack_exists():
assert Stack()