Pytest先执行上次失败然后再执行其他用例

【原文链接】Pytest如何先执行上次失败然后再执行其他用例

在对自动化脚本连跑测试过程中，往往希望优先执行上次连跑失败的脚本，然后再执行其他脚本，Pytest框架支持这样一种连跑机制，通过 –ff 参数即可。下面首先准备如下三个脚本，即第一个和第三个断言失败，第二个断言成功。

def test_01():
    assert 1==2

def test_02():
    assert 2==2

def test_03():
    assert 1==2

首先执行一次，执行结果如下所示，可以看出此时的执行顺序是按照test_01、test_02、test_03的顺序执行的。

(demo--ip5ZZo0) D:\demo>pytest
=================== test session starts ===================
platform win32 -- Python 3.7.9, pytest-7.1.3, pluggy-1.0.0
rootdir: D:\demo
collected 3 items

test_demo.py F.F                                     [100%]

======================== FAILURES =========================
_________________________ test_01 _________________________

    def test_01():
>       assert 1==2
E       assert 1 == 2

test_demo.py:3: AssertionError
_________________________ test_03 _________________________

    def test_03():
>       assert 1==2
E       assert 1 == 2

test_demo.py:9: AssertionError
================= short test summary info =================
FAILED test_demo.py::test_01 - assert 1 == 2
FAILED test_demo.py::test_03 - assert 1 == 2
=============== 2 failed, 1 passed in 0.18s ===============

(demo--ip5ZZo0) D:\demo>

下面使用pytest –ff 参数再次执行，结果如下，可以看出此时是首先执行test_01和test_03，最后执行了test_02，即首先执行了上次失败的用例，然后才执行其他用例。

(demo--ip5ZZo0) D:\demo>pytest --ff
=================== test session starts ===================
platform win32 -- Python 3.7.9, pytest-7.1.3, pluggy-1.0.0
rootdir: D:\demo
collected 3 items
run-last-failure: rerun previous 2 failures first

test_demo.py FF.                                     [100%]

======================== FAILURES =========================
_________________________ test_01 _________________________

    def test_01():
>       assert 1==2
E       assert 1 == 2

test_demo.py:3: AssertionError
_________________________ test_03 _________________________

    def test_03():
>       assert 1==2
E       assert 1 == 2

test_demo.py:9: AssertionError
================= short test summary info =================
FAILED test_demo.py::test_01 - assert 1 == 2
FAILED test_demo.py::test_03 - assert 1 == 2
=============== 2 failed, 1 passed in 0.05s ===============

(demo--ip5ZZo0) D:\demo>

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