我在 cmd 上运行 pytest 并且我收到 AssertionError

Question

所以这是我正在测试的代码：

def test_sum():
    
    test_list=[10,20,30,40,50]

    result=sum(test_list)

    assert result == 150

我得到的错误：

Microsoft Windows [Version 10.0.19041.630]
(c) 2020 Microsoft Corporation. All rights reserved.

C:\Users\97155>python -m pytest
================================================= test session starts =================================================
platform win32 -- Python 3.7.4, pytest-6.1.2, py-1.9.0, pluggy-0.13.1
rootdir: C:\Users\97155
collected 0 items / 1 error

======================================================= ERRORS ========================================================
____________________________________________ ERROR collecting test session ____________________________________________
AppData\Local\Programs\Python\Python37\lib\site-packages\_pytest\runner.py:310: in from_call
    result = func()  # type: Optional[TResult]
AppData\Local\Programs\Python\Python37\lib\site-packages\_pytest\runner.py:340: in <lambda>
    call = CallInfo.from_call(lambda: list(collector.collect()), "collect")
AppData\Local\Programs\Python\Python37\lib\site-packages\_pytest\main.py:684: in collect
    for direntry in visit(str(argpath), self._recurse):
AppData\Local\Programs\Python\Python37\lib\site-packages\_pytest\pathlib.py:570: in visit
    yield from visit(entry.path, recurse)
AppData\Local\Programs\Python\Python37\lib\site-packages\_pytest\pathlib.py:570: in visit
    yield from visit(entry.path, recurse)
AppData\Local\Programs\Python\Python37\lib\site-packages\_pytest\pathlib.py:570: in visit
    yield from visit(entry.path, recurse)
AppData\Local\Programs\Python\Python37\lib\site-packages\_pytest\pathlib.py:566: in visit
    entries = sorted(os.scandir(path), key=lambda entry: entry.name)
E   PermissionError: [WinError 5] Access is denied: 'C:\\Users\\97155\\AppData\\Local\\Application Data'
=============================================== short test summary info ===============================================
ERROR  - PermissionError: [WinError 5] Access is denied: 'C:\\Users\\97155\\AppData\\Local\\Application Data'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
================================================== 1 error in 0.27s ===================================================

我尝试使用命令（python -m pytest）和（pytest）运行代码。 但是，我仍然遇到同样的错误。

Answer 1

首先，您应该深入研究您要学习的库的文档。 pytest的文档可以在这里找到。

您没有从命令行正确执行pytest 。 执行pytest断言有几个步骤：

1. 定义您的测试函数并使用 python 的assert （您已经完成）使用断言语句

2. 将目录更改为包含测试的.py文件所在的目录

3. 使用pytest test_file.py

Answer 2

pytest 在这里崩溃的原因是您从主目录的根目录运行它，并且主目录中的某些文件夹具有特殊权限

当 pytest 启动（无配置/无参数）时，它会尝试递归检测测试——这意味着它将尝试从您的工作目录向下访问每个文件/文件夹

在您的情况下，它会尝试在'C:\\Users\\97155\\AppData\\Local\\Application Data'上列出，我猜这在 windows 上通常是不允许的？

我建议在你的主目录中创建一个子目录并在那里工作，例如我使用workspace

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免责声明：我是 pytest 核心开发人员之一