def test_top_of_empty(self, int_stack: PushStack):
assert int_stack.top() == Token.no_stack_item
def test_top(self, int_stack: PushStack):
int_stack.push(5).push(-10)
assert int_stack.top() == -10
def test_top(self, int_stack: PushStack):
int_stack.push(5).push(-10)
assert int_stack.top() == -10
def test_top_of_empty(self, int_stack: PushStack):
assert int_stack.top() == Token.no_stack_item
def test_init_values(self):
stack = PushStack(PushStr, ["bottom", "middle", "top"])
assert stack.top() == "top"
assert list(stack) == ["bottom", "middle", "top"]