如何清除多个断言语句之间捕获的标准输出/标准错误 [英] How to clear captured stdout/stderr in between of multiple assert statements

问题描述

我在循环中有一些断言测试，每个断言有点像单独的测试，我不希望以前的断言输出污染当前失败断言的错误日志.

I have some tests with assertions in loop, each assertion is kinda like separate test and I don't want previous assertions' output to pollute error logs of current failed assertion.

def test_foos(captured):
    foos = []  # some data
    for foo, bar in foos:
        captured.clear()
        assert logic(foo) == bar

我找到了 caplog.clear但它似乎不起作用.

I have found caplog.clear but it doesn't seem to work.

推荐答案

参数化你的测试.将 foos 作为参数传递，pytest 将多次运行测试 assert 行，记录成功/失败，就好像每个都是单独的测试一样.

Parametrize your test. Pass the foos as parameter and pytest will run the test assert line multiple times, recording success/failure as if each were a separate test.

import pytest

testdata = [
    (3,9),
    (4,16),
    (5,25)
]

@pytest.mark.parametrize("x,expected", testdata)
def test_foos(x, expected):
    assert logic(foo) == bar # in the example, say logic squares the input

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