如何使用 Pytest 将 testCase 值传递给下一个 [英] How to pass testCase value to next one with Pytest

问题描述

import pytest


def add(x):
    return x + 1

def sub(x):
    return x - 1


testData1 = [1, 2]
testData2 = [3]


class Test_math(object):
    @pytest.mark.parametrize('n', testData1)
    def test_add(self, n):
        result = add(n)
        testData2.append(result) <-------- Modify testData here
        assert result == 5

    @pytest.mark.parametrize('n', testData2)
    def test_sub(self, n):
        result = sub(n)
        assert result == 3


if __name__ == '__main__':
    pytest.main()

只有 3 个测试:Test_math.test_add[1],Test_math.test_add[2],Test_math.test_sub[3]在这个场景中执行.

there are only 3 tests :Test_math.test_add[1],Test_math.test_add[2],Test_math.test_sub[3] executed in this scenario.

Test_math.test_sub 仅使用预定义的数据 [3] 执行，这不是我的期望 [2,3,3].如何解决?

Test_math.test_sub only executes with predefined data [3] which is not my expectation [2,3,3]. How to fix it?

更新 [1,2,3]-> [2,3,3]

update [1,2,3]-> [2,3,3]

推荐答案

不完全确定为什么它不起作用，但这样做是个坏主意，因为不能保证测试的顺序(除非您实施广告-用于命令测试执行的 hoc 代码).

Not exactly sure why it didn't work, but doing it like that it's a bad idea since the order of tests is not guaranteed (unless you implement ad-hoc code to order the execution of tests).

除了测试设计的这个问题和其他问题之外，你可以通过在 pytest.mark 中加入 testData1 和 testData2 来实现你想要的.parametrize 装饰器.

Besides this and other issues of test design, the way you can somewhat achieve what you want would be by joining testData1 and testData2 in the pytest.mark.parametrize decorator.

@pytest.mark.parametrize('n', testData1 + testData2)
def test_sub(self, n):
    result = sub(n)
    assert result == 3

现在，请记住，对于您的测试定义，这将始终失败，因为 sub(n) 与 testData1 + testData2 的结果永远不会是 3.

Now, keep in mind that with your test definition, this will always fail because the result of sub(n) with testData1 + testData2 will never be 3.

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