Python [求助帖] Pytest 在 rerun 失败的用例时， setup/teardown 打印的次数异常。
写在前面：
程序：
import pytest
import time
class TestClass_10000():
def setup_method(self):
print ("setup ---->")
def teardown_method(self):
print ("teardown ---->")
def test_one(self):
print ("here is test_one")
assert 1 == 2
在终端执行的命令：
pytest test_collection/test_collection01/test_01.py::TestClass_10000::test_one --html report.html --reruns 1
测试平台信息：
Packages {"pluggy": "1.0.0", "py": "1.11.0", "pytest": "7.1.2"}
Platform macOS-10.16-x86_64-i386-64bit
Plugins {"forked": "1.4.0", "html": "3.1.1", "metadata": "2.0.1", "parallel": "0.0.10", "rerunfailures": "10.2", "xdist": "2.5.0"}
Python 3.9.1
输出的报告：
预期实现的场景：
测试用例在执行前会输出一次"setup"，执行过程中输出一次"here is test_one"，执行结束输出一次"teardown"。 测试用例失败，重新执行一次测试用例，测试用例在执行前会输出一次"setup"，执行过程中输出一次"here is test_one"，执行结束输出一次"teardown"。
按照预期，报告应该是：
Failed:
setup-->
here is test_one
teardown-->
Rerun:
setup -->
here is test_one
teardown-->
疑惑的地方：
- 为什么最终报告里面， Failed 中 "setup" + "here is test_one" + "teardown" 打印了 2 次？
- 为什么最终报告里面， Rerun 中只有 "setup" + "here is test_one", 那 "teardown" 哪里去了呢？
恳请各位路过的大神，慷慨解囊，提供宝贵意见。
好问题，本地试了一下，确实有这个情况存在，而且命令行输出只会有第二个问题，不会有第一个问题：
pytest t.py::TestClass_10000::test_one --html report.html --reruns 1
=========================================================================================================== test session starts ===========================================================================================================
platform darwin -- Python 3.9.2, pytest-6.2.5, py-1.10.0, pluggy-1.0.0
rootdir: /Users/chenhengjie/Documents/Projects/质效改进组/qa_repos/tmp/python_scripts
plugins: metadata-2.0.1, rerunfailures-10.2, html-3.1.1
collected 1 item
t.py R [100%]F [100%]
================================================================================================================ FAILURES =================================================================================================================
________________________________________________________________________________________________________ TestClass_10000.test_one _________________________________________________________________________________________________________
self = <python_scripts.t.TestClass_10000 object at 0x101d2d640>
def test_one(self):
print ("here is test_one")
> assert 1 == 2
E assert 1 == 2
t.py:14: AssertionError
---------------------------------------------------------------------------------------------------------- Captured stdout setup ----------------------------------------------------------------------------------------------------------
setup ---->
---------------------------------------------------------------------------------------------------------- Captured stdout call -----------------------------------------------------------------------------------------------------------
here is test_one
-------------------------------------------------------------------------------------------------------- Captured stdout teardown ---------------------------------------------------------------------------------------------------------
teardown ---->
---------------------------------------------------------------------------------------------------------- Captured stdout setup ----------------------------------------------------------------------------------------------------------
setup ---->
---------------------------------------------------------------------------------------------------------- Captured stdout call -----------------------------------------------------------------------------------------------------------
here is test_one
------------------------------------------------------------- generated html file: file:///Users/chenhengjie/Documents/Projects/质效改进组/qa_repos/tmp/python_scripts/report.html -------------------------------------------------------------
========================================================================================================= short test summary info =========================================================================================================
FAILED t.py::TestClass_10000::test_one - assert 1 == 2
======================================================================================================= 1 failed, 1 rerun in 0.13s =====================================================
从上面输出看，可以基本猜测下两个问题的原因：
1、出现了两次 setup 、teardown ——应该是 html 插件的问题
2、重跑时没有跑 teardown ——应该是重跑插件 runfailtures 的问题
这些问题都是比较细节的问题，推荐你直接看下这些插件的源码逻辑来解析，也有助于你更深入了解 pytest 的机制。时间有限我就没法去细看源码了。
对
陈恒捷
回复
陈恒捷
回复
感谢您的答复。
第一个问题其实是在查看 report.html 的时候发现的，您通过浏览器打开 report.html, 看到 Failed 的那条结果，然后点击"show details"就能发现，打印出了 2 次。 这个地方， 终端输出的确是 1 次， 但是不知道为什么 Failed 结果中却记录了 2 次。 我尝试下看看源码，是否能看懂吧，哈哈~
我这边也试了下。预料之中的是，rerun 时 teardown 运行了。预料之外的是，运行次数多于设置重跑次数。
(venv) C:\Users\Administrator\PycharmProjects\untitled1>pytest testauto.py --reruns 2
================================================================================================= test session starts ==================================================================================================
platform win32 -- Python 3.7.2, pytest-7.1.2, pluggy-1.0.0
rootdir: C:\Users\Administrator\PycharmProjects\untitled1
plugins: rerunfailures-10.2
collected 1 item
testauto.py R [100%]R
[100%]F [100%]
======================================================================================================= FAILURES =======================================================================================================
____________________________________________________________________________________________________ Test1.test_one ____________________________________________________________________________________________________
self = <testauto.Test1 object at 0x0000000003CE9940>
def test_one(self):
print("here is test_one")
> assert 1 == 2
E assert 1 == 2
testauto.py:10: AssertionError
------------------------------------------------------------------------------------------------ Captured stdout setup -------------------------------------------------------------------------------------------------
setup ---->
------------------------------------------------------------------------------------------------- Captured stdout call -------------------------------------------------------------------------------------------------
here is test_one
----------------------------------------------------------------------------------------------- Captured stdout teardown -----------------------------------------------------------------------------------------------
teardown ---->
------------------------------------------------------------------------------------------------ Captured stdout setup -------------------------------------------------------------------------------------------------
setup ---->
------------------------------------------------------------------------------------------------- Captured stdout call -------------------------------------------------------------------------------------------------
here is test_one
----------------------------------------------------------------------------------------------- Captured stdout teardown -----------------------------------------------------------------------------------------------
teardown ---->
------------------------------------------------------------------------------------------------ Captured stdout setup -------------------------------------------------------------------------------------------------
setup ---->
------------------------------------------------------------------------------------------------- Captured stdout call -------------------------------------------------------------------------------------------------
here is test_one
----------------------------------------------------------------------------------------------- Captured stdout teardown -----------------------------------------------------------------------------------------------
teardown ---->
----------------------------------------------------------------------------------------------- Captured stdout teardown -----------------------------------------------------------------------------------------------
teardown ---->
----------------------------------------------------------------------------------------------- Captured stdout teardown -----------------------------------------------------------------------------------------------
teardown ---->
=============================================================================================== short test summary info ================================================================================================
FAILED testauto.py::Test1::test_one - assert 1 == 2
============================================================================================== 1 failed, 2 rerun in 0.06s ==============================================================================================
teardown 这个问题， 在终端显示是没问题的， 您需要用到 pytest-html， 查看 这个插件生成出来的 html 文件。
您说的 “运行次数多余设置重跑次数” 是什么意思吖， 从 short summary 里看 ， 程序的确是 rerun 了 2 次吖 ~
