def test_cmd_push(stack):
cmd_push(stack, '3 4 5')
assert str(stack) == '[3, 4, 5]'
def test_cmd_divide_raises_cmderror_when_division_by_zero(stack):
cmd_push(stack, '0 3')
with pytest.raises(CMDError):
cmd_divide(stack, '')
def test_cmd_pop(stack):
cmd_push(stack, '3 4')
cmd_pop(stack, '')
assert str(stack) == '[3]'
def test_cmd_add(stack):
cmd_push(stack, '3 4')
cmd_add(stack, '')
assert str(stack) == '[7]'
def test_cmd_push_raises_cmderror_when_non_int_args(stack):
with pytest.raises(CMDError):
cmd_push(stack, '1 2 three')