django pytest 没有按预期工作

Question

我正在尝试使用 pytest-django。我认为它已正确安装:

sudo pip install --upgrade pytest-django
Requirement already up-to-date: pytest-django in /usr/local/lib/python2.6/dist-packages

但是:

py.test --ds myproj.settings_module
usage: py.test [options] [file_or_dir] [file_or_dir] [...]
py.test: error: unrecognized arguments: --ds

有什么问题吗？如何检查是否安装了 django-pytest？

更多信息

$ which py.test
/usr/local/bin/py.test
$ py.test --version
This is pytest version 2.5.2, imported from /usr/local/lib/python2.6/dist-packages/pytest.pyc

更多信息 (2)

$ which python
/usr/bin/python
$ python
Python 2.7.3 (default, Jan  2 2013, 16:53:07) 
[GCC 4.7.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pytest_django
>>> 
$ py.test --traceconfig
PLUGIN registered: <_pytest.python.FixtureManager instance at 0x8fa0d6c>
======================================================================== test session starts =========================================================================
platform linux2 -- Python 2.7.3 -- py-1.4.20 -- pytest-2.5.2
using: pytest-2.5.2 pylib-1.4.20
active plugins:
    helpconfig          : /usr/local/lib/python2.7/dist-packages/_pytest/helpconfig.pyc
    pytestconfig        : <_pytest.config.Config object at 0x8ce0f6c>
    runner              : /usr/local/lib/python2.7/dist-packages/_pytest/runner.pyc
    unittest            : /usr/local/lib/python2.7/dist-packages/_pytest/unittest.pyc
    pastebin            : /usr/local/lib/python2.7/dist-packages/_pytest/pastebin.pyc
    skipping            : /usr/local/lib/python2.7/dist-packages/_pytest/skipping.pyc
    genscript           : /usr/local/lib/python2.7/dist-packages/_pytest/genscript.pyc
    session             : <Session 'delme'>
    tmpdir              : /usr/local/lib/python2.7/dist-packages/_pytest/tmpdir.pyc
    capture             : /usr/local/lib/python2.7/dist-packages/_pytest/capture.pyc
    terminalreporter    : <_pytest.terminal.TerminalReporter instance at 0x8df44cc>
    assertion           : /usr/local/lib/python2.7/dist-packages/_pytest/assertion/__init__.pyc
    mark                : /usr/local/lib/python2.7/dist-packages/_pytest/mark.pyc
    terminal            : /usr/local/lib/python2.7/dist-packages/_pytest/terminal.pyc
    main                : /usr/local/lib/python2.7/dist-packages/_pytest/main.pyc
    nose                : /usr/local/lib/python2.7/dist-packages/_pytest/nose.pyc
    python              : /usr/local/lib/python2.7/dist-packages/_pytest/python.pyc
    146879340           : <_pytest.config.PytestPluginManager object at 0x8c1336c>
    recwarn             : /usr/local/lib/python2.7/dist-packages/_pytest/recwarn.pyc
    funcmanage          : <_pytest.python.FixtureManager instance at 0x8fa0d6c>
    monkeypatch         : /usr/local/lib/python2.7/dist-packages/_pytest/monkeypatch.pyc
    resultlog           : /usr/local/lib/python2.7/dist-packages/_pytest/resultlog.pyc
    capturemanager      : <_pytest.capture.CaptureManager instance at 0x8df972c>
    junitxml            : /usr/local/lib/python2.7/dist-packages/_pytest/junitxml.pyc
    doctest             : /usr/local/lib/python2.7/dist-packages/_pytest/doctest.pyc
    pdb                 : /usr/local/lib/python2.7/dist-packages/_pytest/pdb.pyc
collected 0 items 

==========================================================================  in 0.00 seconds ==========================================================================

Answer 1

py.test 文档建议使用 py.test --traceconfig 来确定安装了哪些插件。 (来源:http://pytest.org/latest/plugins.html#finding-out-which-plugins-are-active)

作为完整性检查，我会确保您可以在 Python 提示符下导入 pytest_django。

$ which python
// Expect this to be /usr/local/bin/python
$ python
>>> import pytest_django

至少，在最初的问题和“更多信息 (2)”部分之间，您正在使用两个版本的 Python。请注意，路径首先是如何以 /usr/local/lib/python2.6/ 开头，然后又以 /usr/local/lib/python2.7/ 开头？这很奇怪，像这样的不匹配可以解释为什么您可以导入 pytest_django 而 py.test 没有看到安装的插件。

如果可能的话，我建议使用 virtualenv 来避免这样的环境问题。这是一个关于如何开始的很好的教程:http://www.pythonforbeginners.com/basics/how-to-use-python-virtualenv

试试这个:

sudo pip install virtualenv
virtualenv env --no-site-packages --python=python2.6  // Can be python2.7 too.
source env/bin/activate
pip install pytest-django  // Should pull in Django and pytest dependencies.
py.test --traceconfig