Question

Django项目和postgres位于不同的Docker容器中。

我想使用pytest编写此应用程序的单元测试用例。

我已经使用APIClient()和@pytest.mark.django_db来实现测试用例。但是，从本地Django应用程序执行pytest时，由于存在于其他容器中，因此无法访问数据库。

我还尝试过创建一个包含测试用例的新映像，并登录到该容器中并尝试执行pytests。但是，它显示了django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.

在这种情况下，建议我们如何建立连接以托管来自django的postgres数据库，因为pytest不会在django容器中运行。

注意：代码覆盖范围也是我们的标准，因此不能使用请求模块访问Django REST API。

使用@pytest.mark.django_db之后：

platform win32 -- Python 3.8.2, pytest-6.1.1, py-1.9.0, pluggy-0.13.1 -- c:\users\schitted\appdata\local\programs\python\python38-32\python.exe
cachedir: .pytest_cache
django: settings: app.settings (from ini)
metadata: {'Python': '3.8.2', 'Platform': 'Windows-10-10.0.18362-SP0', 'Packages': {'pytest': '6.1.1', 'py': '1.9.0', 'pluggy': '0.13.1'}, 'Plugins': {'assert-utils': '0.2.1', 'common-subject': '1.0.4', 'cov': '2.10.1', 'djang
o': '4.1.0', 'drf': '1.1.0', 'fixture-order': '0.1.3', 'html': '2.1.1', 'lambda': '1.2.0', 'metadata': '1.10.0'}}
rootdir: C:\code\cc_cat_unittest_git\cat-eob-service\app, configfile: pytest.ini
plugins: assert-utils-0.2.1, common-subject-1.0.4, cov-2.10.1, django-4.1.0, drf-1.1.0, fixture-order-0.1.3, html-2.1.1, lambda-1.2.0, metadata-1.10.0
collected 1 item                                                                                                                                                                                                                 

test/test_django.py::test_unauthorized_request ERROR

============================================================================================================ ERRORS =============================================================================================================
__________________________________________________________________________________________ ERROR at setup of test_unauthorized_request __________________________________________________________________________________________

request = <SubRequest '_django_db_marker' for <Function test_unauthorized_request>>

    @pytest.fixture(autouse=True)
    def _django_db_marker(request):
        """Implement the django_db marker, internal to pytest-django.

        This will dynamically request the ``db``, ``transactional_db`` or
        ``django_db_reset_sequences`` fixtures as required by the django_db marker.
        """
        marker = request.node.get_closest_marker("django_db")
        if marker:
            transaction, reset_sequences = validate_django_db(marker)
            if reset_sequences:
                request.getfixturevalue("django_db_reset_sequences")
            elif transaction:
                request.getfixturevalue("transactional_db")
            else:
>               request.getfixturevalue("db")

c:\users\schitted\appdata\local\programs\python\python38-32\lib\site-packages\pytest_django\plugin.py:436:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
c:\users\schitted\appdata\local\programs\python\python38-32\lib\site-packages\pytest_django\fixtures.py:105: in django_db_setup
    db_cfg = setup_databases(
c:\users\schitted\appdata\local\programs\python\python38-32\lib\site-packages\django\test\utils.py:157: in setup_databases
    test_databases, mirrored_aliases = get_unique_databases_and_mirrors(aliases)
c:\users\schitted\appdata\local\programs\python\python38-32\lib\site-packages\django\test\utils.py:258: in get_unique_databases_and_mirrors
    default_sig = connections[DEFAULT_DB_ALIAS].creation.test_db_signature()
c:\users\schitted\appdata\local\programs\python\python38-32\lib\site-packages\django\db\backends\base\creation.py:303: in test_db_signature
    self._get_test_db_name(),
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <django.db.backends.postgresql.creation.DatabaseCreation object at 0x0423ED60>

    def _get_test_db_name(self):
        """
        Internal implementation - return the name of the test DB that will be
        created. Only useful when called from create_test_db() and
        _create_test_db() and when no external munging is done with the 'NAME'
        settings.
        """
        if self.connection.settings_dict['TEST']['NAME']:
            return self.connection.settings_dict['TEST']['NAME']
>       return TEST_DATABASE_PREFIX + self.connection.settings_dict['NAME']
E       TypeError: can only concatenate str (not "NoneType") to str

c:\users\schitted\appdata\local\programs\python\python38-32\lib\site-packages\django\db\backends\base\creation.py:161: TypeError
==================================================================================================== short test summary info ====================================================================================================
ERROR test/test_django.py::test_unauthorized_request - TypeError: can only concatenate str (not "NoneType") to str
======================================================================================================= 1 error in 19.76s =======================================================================================================```

Answer 1

检查设置文件中提供的postgres主机。确保它已连接到数据库容器。通常，在主机上给出容器名称而不是IP

运行pytest时无法从Django连接到Postgres数据库

1 个答案: