pytest控制函数运行函数

import pytest

class Calc(object):
    @classmethod
    def add(cls, x, y, *d):
        # 加法计算
        result = x + y
        for i in d:
            result += i
        return result

    @classmethod
    def sub(cls, x, y, *d):
        # 减法计算
        result = x - y
        for i in d:
            result -= i
        return result

    @classmethod
    def mul(cls, x, y, *d):
        # 乘法计算
        result = x * y
        for i in d:
            result *= i
        return result

    @staticmethod
    def div(x, y, *d):
        # 除法计算
        if y != 0:
            result = x / y
        else:
            return -1
        for i in d:
            if i != 0:
                result /= i
            else:
                return -1
        return result

@pytest.mark.run(order=2)
def test_add():
    assert Calc.add(1, 2, 3) == 6

@pytest.mark.run(order=3)
def test_add2():
    assert Calc.add(1, 2, 3) == 6


@pytest.mark.run(order=1)
def test_sub():
    assert Calc.sub(100, 20, 30) == 50