python - 尝试访问命令行变量时出现 Pytest KeyError

Question

我用一个新的更简单的假设置重新创建了这个问题。

我有一个框架需要来自 pytest 的命令 channel 变量。此变量称为环境，但当我尝试访问该变量时，我得到一个 AttributeError:“模块”对象没有属性“配置”。

这是我的测试设置:

我知道 py.test 按以下顺序加载:

1. Pytest 插件
2. 外部插件
3. conftest.py 文件，从外层文件到内层文件。

我想我遇到了一个问题，当我加载内部 conftest.py 时，我尝试导入框架。当我导入框架时，它会尝试访问 py.test 变量。这个变量，即使 pytest 已经在我的 outer-conftest.py 的 pytest_addoption() 部分中看到它，还没有准备好在 pytest 中使用。

外赛内容:

# content of conftest.py
import pytest

def pytest_addoption(parser):
    print("First")
    parser.addoption("--cmdopt", action="store", default="type1",
        help="my option: type1 or type2")


@pytest.fixture
def cmdopt(request):
    return request.config.getoption("cmdopt")

framework.py 的内容:

import pytest


class Environment:

    @staticmethod
    def env():
        '''Determine which environment we are operating in,
        if it fails - we assume dca
        '''
        return pytest.config.getoption('cmdopt')


class Users:
    __pool = Environment.env()

内部conftest.py内容:

import pytest
from testing.framework import Environment

test_sample.py 的内容:

# content of test_sample.py
def test_answer(cmdopt):
    if cmdopt == "type1":
        print ("first")
    elif cmdopt == "type2":
        print ("second")
    assert 0 # to see what was printed

我在 testing/文件夹中运行以下命令:py.test -q --cmdopt=type2

我收到以下错误:

First
Second
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/_pytest/config.py", line 513, in getconftestmodules
    return self._path2confmods[path]
KeyError: local('/home/damonp/Repos/stuff/<my-name-redacted>/testing/tests')

During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/_pytest/config.py", line 537, in importconftest
    return self._conftestpath2mod[conftestpath]
KeyError: local('/home/damonp/Repos/stuff/<my-name-redacted>/testing/tests/conftest.py')

During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/_pytest/config.py", line 543, in importconftest
    mod = conftestpath.pyimport()
  File "/usr/local/lib/python3.4/dist-packages/py/_path/local.py", line 641, in pyimport
    __import__(modname)
  File "/home/damonp/Repos/stuff/<my-name-redacted>/testing/tests/conftest.py", line 5, in <module>
    from testing.framework import Environment
  File "/home/damonp/Repos/stuff/<my-name-redacted>/testing/framework.py", line 14, in <module>
    class Users:
  File "/home/damonp/Repos/stuff/<my-name-redacted>/testing/framework.py", line 15, in Users
    __pool = Environment.env()
  File "/home/damonp/Repos/stuff/<my-name-redacted>/testing/framework.py", line 11, in env
    return pytest.config.getoption('cmdopt')
AttributeError: 'module' object has no attribute 'config'
ERROR: could not load /home/damonp/Repos/stuff/<my-name-redacted>/testing/tests/conftest.py

是否有使用依赖于 pytest 命令行变量的外部框架的好方法？

Answer 1

理想情况下，您应该拥有从框架中为您提供对象的固定装置，例如 User(s) 实例。

这些固定装置可以 receive cmdopt fixture，然后可以将该值传递给 init 方法或工厂函数。

例如

@pytest.fixture(scope="function")
def user(cmdarg):
    return Users(cmdarg, ...)

然后在你的测试中，

def test_something(user):
    # do something with user object