我正在写一个创建subprocess.Popen管道的程序。我正在尝试模拟subprocess.Popen，以便每个调用都返回一个不同的字符串，MagicMock以便确保在管道中的特定（或所有）进程上调用方法。
我还希望基于该模拟对它进行自动指定，subprocess.Popen但是不断收到无法基于模拟对它进行自动指定的错误。
目前，我的代码如下：
@pytest.fixture
def Popen(mocker: 'pytest_mock.MockFixture'):
def popen_factory(*args, **kwargs):
popen = mocker.MagicMock() # mocker.create_autospec(subprocess.Popen)
popen.stdin = open(os.devnull, "wb")
popen.stdout = open(os.devnull, "rb")
popen.wait.return_value = 0
return popen
Popen = mocker.patch.object(subprocess, 'Popen', autospec=True)
Popen.side_effect = popen_factory
yield Popen
由于mocker.patch.object(subprocess, 'Popen', autospec=True)覆盖subprocess.Popen，我必须将现有值分配给局部变量，而改用它。
@pytest.fixture
def Popen(mocker: 'pytest_mock.MockFixture'):
real_Popen = subprocess.Popen
def popen_factory(*args, **kwargs):
popen = mocker.create_autospec(real_Popen)
popen.stdin = open(os.devnull, "wb")
popen.stdout = open(os.devnull, "rb")
popen.wait.return_value = 0
return popen
Popen = mocker.patch.object(subprocess, 'Popen', autospec=True)
Popen.side_effect = popen_factory
yield Popen
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