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2146 lines
85 KiB
Plaintext
=============
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Testing tools
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=============
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.. currentmodule:: django.test
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Django provides a small set of tools that come in handy when writing tests.
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.. _test-client:
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The test client
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===============
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The test client is a Python class that acts as a dummy web browser, allowing
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you to test your views and interact with your Django-powered application
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programmatically.
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Some of the things you can do with the test client are:
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* Simulate GET and POST requests on a URL and observe the response --
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everything from low-level HTTP (result headers and status codes) to
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page content.
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* See the chain of redirects (if any) and check the URL and status code at
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each step.
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* Test that a given request is rendered by a given Django template, with
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a template context that contains certain values.
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Note that the test client is not intended to be a replacement for Selenium_ or
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other "in-browser" frameworks. Django's test client has a different focus. In
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short:
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* Use Django's test client to establish that the correct template is being
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rendered and that the template is passed the correct context data.
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* Use :class:`~django.test.RequestFactory` to test view functions directly,
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bypassing the routing and middleware layers.
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* Use in-browser frameworks like Selenium_ to test *rendered* HTML and the
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*behavior* of web pages, namely JavaScript functionality. Django also
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provides special support for those frameworks; see the section on
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:class:`~django.test.LiveServerTestCase` for more details.
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A comprehensive test suite should use a combination of all of these test types.
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Overview and a quick example
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----------------------------
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To use the test client, instantiate ``django.test.Client`` and retrieve
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web pages::
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>>> from django.test import Client
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>>> c = Client()
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>>> response = c.post('/login/', {'username': 'john', 'password': 'smith'})
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>>> response.status_code
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200
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>>> response = c.get('/customer/details/')
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>>> response.content
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b'<!DOCTYPE html...'
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As this example suggests, you can instantiate ``Client`` from within a session
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of the Python interactive interpreter.
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Note a few important things about how the test client works:
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* The test client does *not* require the web server to be running. In fact,
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it will run just fine with no web server running at all! That's because
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it avoids the overhead of HTTP and deals directly with the Django
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framework. This helps make the unit tests run quickly.
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* When retrieving pages, remember to specify the *path* of the URL, not the
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whole domain. For example, this is correct::
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>>> c.get('/login/')
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This is incorrect::
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>>> c.get('https://www.example.com/login/')
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The test client is not capable of retrieving web pages that are not
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powered by your Django project. If you need to retrieve other web pages,
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use a Python standard library module such as :mod:`urllib`.
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* To resolve URLs, the test client uses whatever URLconf is pointed-to by
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your :setting:`ROOT_URLCONF` setting.
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* Although the above example would work in the Python interactive
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interpreter, some of the test client's functionality, notably the
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template-related functionality, is only available *while tests are
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running*.
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The reason for this is that Django's test runner performs a bit of black
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magic in order to determine which template was loaded by a given view.
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This black magic (essentially a patching of Django's template system in
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memory) only happens during test running.
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* By default, the test client will disable any CSRF checks
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performed by your site.
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If, for some reason, you *want* the test client to perform CSRF
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checks, you can create an instance of the test client that
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enforces CSRF checks. To do this, pass in the
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``enforce_csrf_checks`` argument when you construct your
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client::
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>>> from django.test import Client
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>>> csrf_client = Client(enforce_csrf_checks=True)
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Making requests
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---------------
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Use the ``django.test.Client`` class to make requests.
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.. class:: Client(enforce_csrf_checks=False, raise_request_exception=True, json_encoder=DjangoJSONEncoder, *, headers=None, **defaults)
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A testing HTTP client. Takes several arguments that can customize behavior.
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``headers`` allows you to specify default headers that will be sent with
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every request. For example, to set a ``User-Agent`` header::
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client = Client(headers={"user-agent": "curl/7.79.1"})
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Arbitrary keyword arguments in ``**defaults`` set WSGI
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:pep:`environ variables <3333#environ-variables>`. For example, to set the
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script name::
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client = Client(SCRIPT_NAME="/app/")
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.. note::
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Keyword arguments starting with a ``HTTP_`` prefix are set as headers,
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but the ``headers`` parameter should be preferred for readability.
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The values from the ``headers`` and ``extra`` keyword arguments passed to
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:meth:`~django.test.Client.get()`,
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:meth:`~django.test.Client.post()`, etc. have precedence over
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the defaults passed to the class constructor.
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The ``enforce_csrf_checks`` argument can be used to test CSRF
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protection (see above).
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The ``raise_request_exception`` argument allows controlling whether or not
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exceptions raised during the request should also be raised in the test.
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Defaults to ``True``.
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The ``json_encoder`` argument allows setting a custom JSON encoder for
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the JSON serialization that's described in :meth:`post`.
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Once you have a ``Client`` instance, you can call any of the following
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methods:
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.. versionchanged:: 4.2
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The ``headers`` parameter was added.
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.. method:: Client.get(path, data=None, follow=False, secure=False, *, headers=None, **extra)
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Makes a GET request on the provided ``path`` and returns a ``Response``
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object, which is documented below.
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The key-value pairs in the ``data`` dictionary are used to create a GET
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data payload. For example::
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>>> c = Client()
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>>> c.get('/customers/details/', {'name': 'fred', 'age': 7})
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...will result in the evaluation of a GET request equivalent to::
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/customers/details/?name=fred&age=7
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The ``headers`` parameter can be used to specify headers to be sent in
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the request. For example::
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>>> c = Client()
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>>> c.get('/customers/details/', {'name': 'fred', 'age': 7},
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... headers={'accept': 'application/json'})
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...will send the HTTP header ``HTTP_ACCEPT`` to the details view, which
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is a good way to test code paths that use the
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:meth:`django.http.HttpRequest.accepts()` method.
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Arbitrary keyword arguments set WSGI
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:pep:`environ variables <3333#environ-variables>`. For example, headers
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to set the script name::
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>>> c = Client()
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>>> c.get("/", SCRIPT_NAME="/app/")
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If you already have the GET arguments in URL-encoded form, you can
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use that encoding instead of using the data argument. For example,
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the previous GET request could also be posed as::
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>>> c = Client()
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>>> c.get('/customers/details/?name=fred&age=7')
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If you provide a URL with both an encoded GET data and a data argument,
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the data argument will take precedence.
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If you set ``follow`` to ``True`` the client will follow any redirects
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and a ``redirect_chain`` attribute will be set in the response object
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containing tuples of the intermediate urls and status codes.
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If you had a URL ``/redirect_me/`` that redirected to ``/next/``, that
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redirected to ``/final/``, this is what you'd see::
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>>> response = c.get('/redirect_me/', follow=True)
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>>> response.redirect_chain
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[('http://testserver/next/', 302), ('http://testserver/final/', 302)]
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If you set ``secure`` to ``True`` the client will emulate an HTTPS
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request.
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.. versionchanged:: 4.2
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The ``headers`` parameter was added.
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.. method:: Client.post(path, data=None, content_type=MULTIPART_CONTENT, follow=False, secure=False, *, headers=None, **extra)
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Makes a POST request on the provided ``path`` and returns a
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``Response`` object, which is documented below.
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The key-value pairs in the ``data`` dictionary are used to submit POST
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data. For example::
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>>> c = Client()
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>>> c.post('/login/', {'name': 'fred', 'passwd': 'secret'})
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...will result in the evaluation of a POST request to this URL::
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/login/
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...with this POST data::
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name=fred&passwd=secret
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If you provide ``content_type`` as :mimetype:`application/json`, the
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``data`` is serialized using :func:`json.dumps` if it's a dict, list,
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or tuple. Serialization is performed with
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:class:`~django.core.serializers.json.DjangoJSONEncoder` by default,
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and can be overridden by providing a ``json_encoder`` argument to
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:class:`Client`. This serialization also happens for :meth:`put`,
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:meth:`patch`, and :meth:`delete` requests.
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If you provide any other ``content_type`` (e.g. :mimetype:`text/xml`
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for an XML payload), the contents of ``data`` are sent as-is in the
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POST request, using ``content_type`` in the HTTP ``Content-Type``
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header.
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If you don't provide a value for ``content_type``, the values in
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``data`` will be transmitted with a content type of
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:mimetype:`multipart/form-data`. In this case, the key-value pairs in
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``data`` will be encoded as a multipart message and used to create the
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POST data payload.
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To submit multiple values for a given key -- for example, to specify
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the selections for a ``<select multiple>`` -- provide the values as a
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list or tuple for the required key. For example, this value of ``data``
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would submit three selected values for the field named ``choices``::
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{'choices': ['a', 'b', 'd']}
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Submitting files is a special case. To POST a file, you need only
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provide the file field name as a key, and a file handle to the file you
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wish to upload as a value. For example, if your form has fields
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``name`` and ``attachment``, the latter a
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:class:`~django.forms.FileField`::
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>>> c = Client()
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>>> with open('wishlist.doc', 'rb') as fp:
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... c.post('/customers/wishes/', {'name': 'fred', 'attachment': fp})
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You may also provide any file-like object (e.g., :class:`~io.StringIO` or
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:class:`~io.BytesIO`) as a file handle. If you're uploading to an
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:class:`~django.db.models.ImageField`, the object needs a ``name``
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attribute that passes the
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:data:`~django.core.validators.validate_image_file_extension` validator.
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For example::
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>>> from io import BytesIO
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>>> img = BytesIO(
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... b"GIF89a\x01\x00\x01\x00\x00\x00\x00!\xf9\x04\x01\x00\x00\x00"
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... b"\x00,\x00\x00\x00\x00\x01\x00\x01\x00\x00\x02\x01\x00\x00"
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... )
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>>> img.name = "myimage.gif"
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Note that if you wish to use the same file handle for multiple
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``post()`` calls then you will need to manually reset the file
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pointer between posts. The easiest way to do this is to
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manually close the file after it has been provided to
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``post()``, as demonstrated above.
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You should also ensure that the file is opened in a way that
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allows the data to be read. If your file contains binary data
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such as an image, this means you will need to open the file in
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``rb`` (read binary) mode.
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The ``headers`` and ``extra`` parameters acts the same as for
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:meth:`Client.get`.
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If the URL you request with a POST contains encoded parameters, these
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parameters will be made available in the request.GET data. For example,
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if you were to make the request::
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>>> c.post('/login/?visitor=true', {'name': 'fred', 'passwd': 'secret'})
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... the view handling this request could interrogate request.POST
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to retrieve the username and password, and could interrogate request.GET
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to determine if the user was a visitor.
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If you set ``follow`` to ``True`` the client will follow any redirects
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and a ``redirect_chain`` attribute will be set in the response object
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containing tuples of the intermediate urls and status codes.
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If you set ``secure`` to ``True`` the client will emulate an HTTPS
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request.
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.. versionchanged:: 4.2
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The ``headers`` parameter was added.
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.. method:: Client.head(path, data=None, follow=False, secure=False, *, headers=None, **extra)
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Makes a HEAD request on the provided ``path`` and returns a
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``Response`` object. This method works just like :meth:`Client.get`,
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including the ``follow``, ``secure``, ``headers``, and ``extra``
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parameters, except it does not return a message body.
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.. versionchanged:: 4.2
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The ``headers`` parameter was added.
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.. method:: Client.options(path, data='', content_type='application/octet-stream', follow=False, secure=False, *, headers=None, **extra)
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Makes an OPTIONS request on the provided ``path`` and returns a
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``Response`` object. Useful for testing RESTful interfaces.
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When ``data`` is provided, it is used as the request body, and
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a ``Content-Type`` header is set to ``content_type``.
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The ``follow``, ``secure``, ``headers``, and ``extra`` parameters act
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the same as for :meth:`Client.get`.
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.. versionchanged:: 4.2
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The ``headers`` parameter was added.
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.. method:: Client.put(path, data='', content_type='application/octet-stream', follow=False, secure=False, *, headers=None, **extra)
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Makes a PUT request on the provided ``path`` and returns a
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``Response`` object. Useful for testing RESTful interfaces.
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When ``data`` is provided, it is used as the request body, and
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a ``Content-Type`` header is set to ``content_type``.
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The ``follow``, ``secure``, ``headers``, and ``extra`` parameters act
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the same as for :meth:`Client.get`.
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.. versionchanged:: 4.2
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The ``headers`` parameter was added.
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.. method:: Client.patch(path, data='', content_type='application/octet-stream', follow=False, secure=False, *, headers=None, **extra)
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Makes a PATCH request on the provided ``path`` and returns a
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``Response`` object. Useful for testing RESTful interfaces.
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The ``follow``, ``secure``, ``headers``, and ``extra`` parameters act
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the same as for :meth:`Client.get`.
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.. versionchanged:: 4.2
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The ``headers`` parameter was added.
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.. method:: Client.delete(path, data='', content_type='application/octet-stream', follow=False, secure=False, *, headers=None, **extra)
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Makes a DELETE request on the provided ``path`` and returns a
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``Response`` object. Useful for testing RESTful interfaces.
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When ``data`` is provided, it is used as the request body, and
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a ``Content-Type`` header is set to ``content_type``.
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The ``follow``, ``secure``, ``headers``, and ``extra`` parameters act
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the same as for :meth:`Client.get`.
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.. versionchanged:: 4.2
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The ``headers`` parameter was added.
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.. method:: Client.trace(path, follow=False, secure=False, *, headers=None, **extra)
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Makes a TRACE request on the provided ``path`` and returns a
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``Response`` object. Useful for simulating diagnostic probes.
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Unlike the other request methods, ``data`` is not provided as a keyword
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parameter in order to comply with :rfc:`9110#section-9.3.8`, which
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mandates that TRACE requests must not have a body.
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The ``follow``, ``secure``, ``headers``, and ``extra`` parameters act
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the same as for :meth:`Client.get`.
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.. versionchanged:: 4.2
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The ``headers`` parameter was added.
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.. method:: Client.login(**credentials)
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If your site uses Django's :doc:`authentication system</topics/auth/index>`
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and you deal with logging in users, you can use the test client's
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``login()`` method to simulate the effect of a user logging into the
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site.
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After you call this method, the test client will have all the cookies
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and session data required to pass any login-based tests that may form
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part of a view.
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The format of the ``credentials`` argument depends on which
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:ref:`authentication backend <authentication-backends>` you're using
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(which is configured by your :setting:`AUTHENTICATION_BACKENDS`
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setting). If you're using the standard authentication backend provided
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by Django (``ModelBackend``), ``credentials`` should be the user's
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username and password, provided as keyword arguments::
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>>> c = Client()
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>>> c.login(username='fred', password='secret')
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# Now you can access a view that's only available to logged-in users.
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If you're using a different authentication backend, this method may
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require different credentials. It requires whichever credentials are
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required by your backend's ``authenticate()`` method.
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``login()`` returns ``True`` if it the credentials were accepted and
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login was successful.
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Finally, you'll need to remember to create user accounts before you can
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use this method. As we explained above, the test runner is executed
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using a test database, which contains no users by default. As a result,
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user accounts that are valid on your production site will not work
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under test conditions. You'll need to create users as part of the test
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suite -- either manually (using the Django model API) or with a test
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fixture. Remember that if you want your test user to have a password,
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you can't set the user's password by setting the password attribute
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directly -- you must use the
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:meth:`~django.contrib.auth.models.User.set_password()` function to
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store a correctly hashed password. Alternatively, you can use the
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:meth:`~django.contrib.auth.models.UserManager.create_user` helper
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method to create a new user with a correctly hashed password.
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.. method:: Client.force_login(user, backend=None)
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If your site uses Django's :doc:`authentication
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system</topics/auth/index>`, you can use the ``force_login()`` method
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to simulate the effect of a user logging into the site. Use this method
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instead of :meth:`login` when a test requires a user be logged in and
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the details of how a user logged in aren't important.
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Unlike ``login()``, this method skips the authentication and
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verification steps: inactive users (:attr:`is_active=False
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<django.contrib.auth.models.User.is_active>`) are permitted to login
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and the user's credentials don't need to be provided.
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The user will have its ``backend`` attribute set to the value of the
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``backend`` argument (which should be a dotted Python path string), or
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to ``settings.AUTHENTICATION_BACKENDS[0]`` if a value isn't provided.
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The :func:`~django.contrib.auth.authenticate` function called by
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:meth:`login` normally annotates the user like this.
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This method is faster than ``login()`` since the expensive
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password hashing algorithms are bypassed. Also, you can speed up
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``login()`` by :ref:`using a weaker hasher while testing
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<speeding-up-tests-auth-hashers>`.
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.. method:: Client.logout()
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If your site uses Django's :doc:`authentication system</topics/auth/index>`,
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the ``logout()`` method can be used to simulate the effect of a user
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logging out of your site.
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After you call this method, the test client will have all the cookies
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and session data cleared to defaults. Subsequent requests will appear
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to come from an :class:`~django.contrib.auth.models.AnonymousUser`.
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Testing responses
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-----------------
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The ``get()`` and ``post()`` methods both return a ``Response`` object. This
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``Response`` object is *not* the same as the ``HttpResponse`` object returned
|
|
by Django views; the test response object has some additional data useful for
|
|
test code to verify.
|
|
|
|
Specifically, a ``Response`` object has the following attributes:
|
|
|
|
.. class:: Response()
|
|
|
|
.. attribute:: client
|
|
|
|
The test client that was used to make the request that resulted in the
|
|
response.
|
|
|
|
.. attribute:: content
|
|
|
|
The body of the response, as a bytestring. This is the final page
|
|
content as rendered by the view, or any error message.
|
|
|
|
.. attribute:: context
|
|
|
|
The template ``Context`` instance that was used to render the template that
|
|
produced the response content.
|
|
|
|
If the rendered page used multiple templates, then ``context`` will be a
|
|
list of ``Context`` objects, in the order in which they were rendered.
|
|
|
|
Regardless of the number of templates used during rendering, you can
|
|
retrieve context values using the ``[]`` operator. For example, the
|
|
context variable ``name`` could be retrieved using::
|
|
|
|
>>> response = client.get('/foo/')
|
|
>>> response.context['name']
|
|
'Arthur'
|
|
|
|
.. admonition:: Not using Django templates?
|
|
|
|
This attribute is only populated when using the
|
|
:class:`~django.template.backends.django.DjangoTemplates` backend.
|
|
If you're using another template engine,
|
|
:attr:`~django.template.response.SimpleTemplateResponse.context_data`
|
|
may be a suitable alternative on responses with that attribute.
|
|
|
|
.. attribute:: exc_info
|
|
|
|
A tuple of three values that provides information about the unhandled
|
|
exception, if any, that occurred during the view.
|
|
|
|
The values are (type, value, traceback), the same as returned by
|
|
Python's :func:`sys.exc_info`. Their meanings are:
|
|
|
|
- *type*: The type of the exception.
|
|
- *value*: The exception instance.
|
|
- *traceback*: A traceback object which encapsulates the call stack at
|
|
the point where the exception originally occurred.
|
|
|
|
If no exception occurred, then ``exc_info`` will be ``None``.
|
|
|
|
.. method:: json(**kwargs)
|
|
|
|
The body of the response, parsed as JSON. Extra keyword arguments are
|
|
passed to :func:`json.loads`. For example::
|
|
|
|
>>> response = client.get('/foo/')
|
|
>>> response.json()['name']
|
|
'Arthur'
|
|
|
|
If the ``Content-Type`` header is not ``"application/json"``, then a
|
|
:exc:`ValueError` will be raised when trying to parse the response.
|
|
|
|
.. attribute:: request
|
|
|
|
The request data that stimulated the response.
|
|
|
|
.. attribute:: wsgi_request
|
|
|
|
The ``WSGIRequest`` instance generated by the test handler that
|
|
generated the response.
|
|
|
|
.. attribute:: status_code
|
|
|
|
The HTTP status of the response, as an integer. For a full list
|
|
of defined codes, see the `IANA status code registry`_.
|
|
|
|
.. _IANA status code registry: https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
|
|
|
|
.. attribute:: templates
|
|
|
|
A list of ``Template`` instances used to render the final content, in
|
|
the order they were rendered. For each template in the list, use
|
|
``template.name`` to get the template's file name, if the template was
|
|
loaded from a file. (The name is a string such as
|
|
``'admin/index.html'``.)
|
|
|
|
.. admonition:: Not using Django templates?
|
|
|
|
This attribute is only populated when using the
|
|
:class:`~django.template.backends.django.DjangoTemplates` backend.
|
|
If you're using another template engine,
|
|
:attr:`~django.template.response.SimpleTemplateResponse.template_name`
|
|
may be a suitable alternative if you only need the name of the
|
|
template used for rendering.
|
|
|
|
.. attribute:: resolver_match
|
|
|
|
An instance of :class:`~django.urls.ResolverMatch` for the response.
|
|
You can use the :attr:`~django.urls.ResolverMatch.func` attribute, for
|
|
example, to verify the view that served the response::
|
|
|
|
# my_view here is a function based view.
|
|
self.assertEqual(response.resolver_match.func, my_view)
|
|
|
|
# Class-based views need to compare the view_class, as the
|
|
# functions generated by as_view() won't be equal.
|
|
self.assertIs(response.resolver_match.func.view_class, MyView)
|
|
|
|
If the given URL is not found, accessing this attribute will raise a
|
|
:exc:`~django.urls.Resolver404` exception.
|
|
|
|
As with a normal response, you can also access the headers through
|
|
:attr:`.HttpResponse.headers`. For example, you could determine the content
|
|
type of a response using ``response.headers['Content-Type']``.
|
|
|
|
Exceptions
|
|
----------
|
|
|
|
If you point the test client at a view that raises an exception and
|
|
``Client.raise_request_exception`` is ``True``, that exception will be visible
|
|
in the test case. You can then use a standard ``try ... except`` block or
|
|
:meth:`~unittest.TestCase.assertRaises` to test for exceptions.
|
|
|
|
The only exceptions that are not visible to the test client are
|
|
:class:`~django.http.Http404`,
|
|
:class:`~django.core.exceptions.PermissionDenied`, :exc:`SystemExit`, and
|
|
:class:`~django.core.exceptions.SuspiciousOperation`. Django catches these
|
|
exceptions internally and converts them into the appropriate HTTP response
|
|
codes. In these cases, you can check ``response.status_code`` in your test.
|
|
|
|
If ``Client.raise_request_exception`` is ``False``, the test client will return a
|
|
500 response as would be returned to a browser. The response has the attribute
|
|
:attr:`~Response.exc_info` to provide information about the unhandled
|
|
exception.
|
|
|
|
Persistent state
|
|
----------------
|
|
|
|
The test client is stateful. If a response returns a cookie, then that cookie
|
|
will be stored in the test client and sent with all subsequent ``get()`` and
|
|
``post()`` requests.
|
|
|
|
Expiration policies for these cookies are not followed. If you want a cookie
|
|
to expire, either delete it manually or create a new ``Client`` instance (which
|
|
will effectively delete all cookies).
|
|
|
|
A test client has attributes that store persistent state information. You can
|
|
access these properties as part of a test condition.
|
|
|
|
.. attribute:: Client.cookies
|
|
|
|
A Python :class:`~http.cookies.SimpleCookie` object, containing the current
|
|
values of all the client cookies. See the documentation of the
|
|
:mod:`http.cookies` module for more.
|
|
|
|
.. attribute:: Client.session
|
|
|
|
A dictionary-like object containing session information. See the
|
|
:doc:`session documentation</topics/http/sessions>` for full details.
|
|
|
|
To modify the session and then save it, it must be stored in a variable
|
|
first (because a new ``SessionStore`` is created every time this property
|
|
is accessed)::
|
|
|
|
def test_something(self):
|
|
session = self.client.session
|
|
session['somekey'] = 'test'
|
|
session.save()
|
|
|
|
Setting the language
|
|
--------------------
|
|
|
|
When testing applications that support internationalization and localization,
|
|
you might want to set the language for a test client request. The method for
|
|
doing so depends on whether or not the
|
|
:class:`~django.middleware.locale.LocaleMiddleware` is enabled.
|
|
|
|
If the middleware is enabled, the language can be set by creating a cookie with
|
|
a name of :setting:`LANGUAGE_COOKIE_NAME` and a value of the language code::
|
|
|
|
from django.conf import settings
|
|
|
|
def test_language_using_cookie(self):
|
|
self.client.cookies.load({settings.LANGUAGE_COOKIE_NAME: 'fr'})
|
|
response = self.client.get('/')
|
|
self.assertEqual(response.content, b"Bienvenue sur mon site.")
|
|
|
|
or by including the ``Accept-Language`` HTTP header in the request::
|
|
|
|
def test_language_using_header(self):
|
|
response = self.client.get("/", headers={"accept-language": "fr"})
|
|
self.assertEqual(response.content, b"Bienvenue sur mon site.")
|
|
|
|
More details are in :ref:`how-django-discovers-language-preference`.
|
|
|
|
If the middleware isn't enabled, the active language may be set using
|
|
:func:`.translation.override`::
|
|
|
|
from django.utils import translation
|
|
|
|
def test_language_using_override(self):
|
|
with translation.override('fr'):
|
|
response = self.client.get('/')
|
|
self.assertEqual(response.content, b"Bienvenue sur mon site.")
|
|
|
|
More details are in :ref:`explicitly-setting-the-active-language`.
|
|
|
|
Example
|
|
-------
|
|
|
|
The following is a unit test using the test client::
|
|
|
|
import unittest
|
|
from django.test import Client
|
|
|
|
class SimpleTest(unittest.TestCase):
|
|
def setUp(self):
|
|
# Every test needs a client.
|
|
self.client = Client()
|
|
|
|
def test_details(self):
|
|
# Issue a GET request.
|
|
response = self.client.get('/customer/details/')
|
|
|
|
# Check that the response is 200 OK.
|
|
self.assertEqual(response.status_code, 200)
|
|
|
|
# Check that the rendered context contains 5 customers.
|
|
self.assertEqual(len(response.context['customers']), 5)
|
|
|
|
.. seealso::
|
|
|
|
:class:`django.test.RequestFactory`
|
|
|
|
.. _django-testcase-subclasses:
|
|
|
|
Provided test case classes
|
|
==========================
|
|
|
|
Normal Python unit test classes extend a base class of
|
|
:class:`unittest.TestCase`. Django provides a few extensions of this base class:
|
|
|
|
.. _testcase_hierarchy_diagram:
|
|
|
|
.. figure:: _images/django_unittest_classes_hierarchy.*
|
|
:alt: Hierarchy of Django unit testing classes (TestCase subclasses)
|
|
:width: 508
|
|
:height: 328
|
|
|
|
Hierarchy of Django unit testing classes
|
|
|
|
You can convert a normal :class:`unittest.TestCase` to any of the subclasses:
|
|
change the base class of your test from ``unittest.TestCase`` to the subclass.
|
|
All of the standard Python unit test functionality will be available, and it
|
|
will be augmented with some useful additions as described in each section
|
|
below.
|
|
|
|
``SimpleTestCase``
|
|
------------------
|
|
|
|
.. class:: SimpleTestCase()
|
|
|
|
A subclass of :class:`unittest.TestCase` that adds this functionality:
|
|
|
|
* Some useful assertions like:
|
|
|
|
* Checking that a callable :meth:`raises a certain exception
|
|
<SimpleTestCase.assertRaisesMessage>`.
|
|
* Checking that a callable :meth:`triggers a certain warning
|
|
<SimpleTestCase.assertWarnsMessage>`.
|
|
* Testing form field :meth:`rendering and error treatment
|
|
<SimpleTestCase.assertFieldOutput>`.
|
|
* Testing :meth:`HTML responses for the presence/lack of a given fragment
|
|
<SimpleTestCase.assertContains>`.
|
|
* Verifying that a template :meth:`has/hasn't been used to generate a given
|
|
response content <SimpleTestCase.assertTemplateUsed>`.
|
|
* Verifying that two :meth:`URLs <SimpleTestCase.assertURLEqual>` are equal.
|
|
* Verifying an HTTP :meth:`redirect <SimpleTestCase.assertRedirects>` is
|
|
performed by the app.
|
|
* Robustly testing two :meth:`HTML fragments <SimpleTestCase.assertHTMLEqual>`
|
|
for equality/inequality or :meth:`containment <SimpleTestCase.assertInHTML>`.
|
|
* Robustly testing two :meth:`XML fragments <SimpleTestCase.assertXMLEqual>`
|
|
for equality/inequality.
|
|
* Robustly testing two :meth:`JSON fragments <SimpleTestCase.assertJSONEqual>`
|
|
for equality.
|
|
|
|
* The ability to run tests with :ref:`modified settings <overriding-settings>`.
|
|
* Using the :attr:`~SimpleTestCase.client` :class:`~django.test.Client`.
|
|
|
|
If your tests make any database queries, use subclasses
|
|
:class:`~django.test.TransactionTestCase` or :class:`~django.test.TestCase`.
|
|
|
|
.. attribute:: SimpleTestCase.databases
|
|
|
|
:class:`~SimpleTestCase` disallows database queries by default. This
|
|
helps to avoid executing write queries which will affect other tests
|
|
since each ``SimpleTestCase`` test isn't run in a transaction. If you
|
|
aren't concerned about this problem, you can disable this behavior by
|
|
setting the ``databases`` class attribute to ``'__all__'`` on your test
|
|
class.
|
|
|
|
.. warning::
|
|
|
|
``SimpleTestCase`` and its subclasses (e.g. ``TestCase``, ...) rely on
|
|
``setUpClass()`` and ``tearDownClass()`` to perform some class-wide
|
|
initialization (e.g. overriding settings). If you need to override those
|
|
methods, don't forget to call the ``super`` implementation::
|
|
|
|
class MyTestCase(TestCase):
|
|
|
|
@classmethod
|
|
def setUpClass(cls):
|
|
super().setUpClass()
|
|
...
|
|
|
|
@classmethod
|
|
def tearDownClass(cls):
|
|
...
|
|
super().tearDownClass()
|
|
|
|
Be sure to account for Python's behavior if an exception is raised during
|
|
``setUpClass()``. If that happens, neither the tests in the class nor
|
|
``tearDownClass()`` are run. In the case of :class:`django.test.TestCase`,
|
|
this will leak the transaction created in ``super()`` which results in
|
|
various symptoms including a segmentation fault on some platforms (reported
|
|
on macOS). If you want to intentionally raise an exception such as
|
|
:exc:`unittest.SkipTest` in ``setUpClass()``, be sure to do it before
|
|
calling ``super()`` to avoid this.
|
|
|
|
``TransactionTestCase``
|
|
-----------------------
|
|
|
|
.. class:: TransactionTestCase()
|
|
|
|
``TransactionTestCase`` inherits from :class:`~django.test.SimpleTestCase` to
|
|
add some database-specific features:
|
|
|
|
* Resetting the database to a known state at the beginning of each test to
|
|
ease testing and using the ORM.
|
|
* Database :attr:`~TransactionTestCase.fixtures`.
|
|
* Test :ref:`skipping based on database backend features <skipping-tests>`.
|
|
* The remaining specialized :meth:`assert*
|
|
<TransactionTestCase.assertQuerySetEqual>` methods.
|
|
|
|
Django's :class:`TestCase` class is a more commonly used subclass of
|
|
``TransactionTestCase`` that makes use of database transaction facilities
|
|
to speed up the process of resetting the database to a known state at the
|
|
beginning of each test. A consequence of this, however, is that some database
|
|
behaviors cannot be tested within a Django ``TestCase`` class. For instance,
|
|
you cannot test that a block of code is executing within a transaction, as is
|
|
required when using
|
|
:meth:`~django.db.models.query.QuerySet.select_for_update()`. In those cases,
|
|
you should use ``TransactionTestCase``.
|
|
|
|
``TransactionTestCase`` and ``TestCase`` are identical except for the manner
|
|
in which the database is reset to a known state and the ability for test code
|
|
to test the effects of commit and rollback:
|
|
|
|
* A ``TransactionTestCase`` resets the database after the test runs by
|
|
truncating all tables. A ``TransactionTestCase`` may call commit and rollback
|
|
and observe the effects of these calls on the database.
|
|
|
|
* A ``TestCase``, on the other hand, does not truncate tables after a test.
|
|
Instead, it encloses the test code in a database transaction that is rolled
|
|
back at the end of the test. This guarantees that the rollback at the end of
|
|
the test restores the database to its initial state.
|
|
|
|
.. warning::
|
|
|
|
``TestCase`` running on a database that does not support rollback (e.g. MySQL
|
|
with the MyISAM storage engine), and all instances of ``TransactionTestCase``,
|
|
will roll back at the end of the test by deleting all data from the test
|
|
database.
|
|
|
|
Apps :ref:`will not see their data reloaded <test-case-serialized-rollback>`;
|
|
if you need this functionality (for example, third-party apps should enable
|
|
this) you can set ``serialized_rollback = True`` inside the
|
|
``TestCase`` body.
|
|
|
|
``TestCase``
|
|
------------
|
|
|
|
.. class:: TestCase()
|
|
|
|
This is the most common class to use for writing tests in Django. It inherits
|
|
from :class:`TransactionTestCase` (and by extension :class:`SimpleTestCase`).
|
|
If your Django application doesn't use a database, use :class:`SimpleTestCase`.
|
|
|
|
The class:
|
|
|
|
* Wraps the tests within two nested :func:`~django.db.transaction.atomic`
|
|
blocks: one for the whole class and one for each test. Therefore, if you want
|
|
to test some specific database transaction behavior, use
|
|
:class:`TransactionTestCase`.
|
|
|
|
* Checks deferrable database constraints at the end of each test.
|
|
|
|
It also provides an additional method:
|
|
|
|
.. classmethod:: TestCase.setUpTestData()
|
|
|
|
The class-level ``atomic`` block described above allows the creation of
|
|
initial data at the class level, once for the whole ``TestCase``. This
|
|
technique allows for faster tests as compared to using ``setUp()``.
|
|
|
|
For example::
|
|
|
|
from django.test import TestCase
|
|
|
|
class MyTests(TestCase):
|
|
@classmethod
|
|
def setUpTestData(cls):
|
|
# Set up data for the whole TestCase
|
|
cls.foo = Foo.objects.create(bar="Test")
|
|
...
|
|
|
|
def test1(self):
|
|
# Some test using self.foo
|
|
...
|
|
|
|
def test2(self):
|
|
# Some other test using self.foo
|
|
...
|
|
|
|
Note that if the tests are run on a database with no transaction support
|
|
(for instance, MySQL with the MyISAM engine), ``setUpTestData()`` will be
|
|
called before each test, negating the speed benefits.
|
|
|
|
Objects assigned to class attributes in ``setUpTestData()`` must support
|
|
creating deep copies with :py:func:`copy.deepcopy` in order to isolate them
|
|
from alterations performed by each test methods.
|
|
|
|
.. classmethod:: TestCase.captureOnCommitCallbacks(using=DEFAULT_DB_ALIAS, execute=False)
|
|
|
|
Returns a context manager that captures :func:`transaction.on_commit()
|
|
<django.db.transaction.on_commit>` callbacks for the given database
|
|
connection. It returns a list that contains, on exit of the context, the
|
|
captured callback functions. From this list you can make assertions on the
|
|
callbacks or call them to invoke their side effects, emulating a commit.
|
|
|
|
``using`` is the alias of the database connection to capture callbacks for.
|
|
|
|
If ``execute`` is ``True``, all the callbacks will be called as the context
|
|
manager exits, if no exception occurred. This emulates a commit after the
|
|
wrapped block of code.
|
|
|
|
For example::
|
|
|
|
from django.core import mail
|
|
from django.test import TestCase
|
|
|
|
|
|
class ContactTests(TestCase):
|
|
def test_post(self):
|
|
with self.captureOnCommitCallbacks(execute=True) as callbacks:
|
|
response = self.client.post(
|
|
'/contact/',
|
|
{'message': 'I like your site'},
|
|
)
|
|
|
|
self.assertEqual(response.status_code, 200)
|
|
self.assertEqual(len(callbacks), 1)
|
|
self.assertEqual(len(mail.outbox), 1)
|
|
self.assertEqual(mail.outbox[0].subject, 'Contact Form')
|
|
self.assertEqual(mail.outbox[0].body, 'I like your site')
|
|
|
|
.. _live-test-server:
|
|
|
|
``LiveServerTestCase``
|
|
----------------------
|
|
|
|
.. class:: LiveServerTestCase()
|
|
|
|
``LiveServerTestCase`` does basically the same as
|
|
:class:`~django.test.TransactionTestCase` with one extra feature: it launches a
|
|
live Django server in the background on setup, and shuts it down on teardown.
|
|
This allows the use of automated test clients other than the
|
|
:ref:`Django dummy client <test-client>` such as, for example, the Selenium_
|
|
client, to execute a series of functional tests inside a browser and simulate a
|
|
real user's actions.
|
|
|
|
The live server listens on ``localhost`` and binds to port 0 which uses a free
|
|
port assigned by the operating system. The server's URL can be accessed with
|
|
``self.live_server_url`` during the tests.
|
|
|
|
To demonstrate how to use ``LiveServerTestCase``, let's write a Selenium test.
|
|
First of all, you need to install the `selenium package`_ into your Python
|
|
path:
|
|
|
|
.. console::
|
|
|
|
$ python -m pip install selenium
|
|
|
|
Then, add a ``LiveServerTestCase``-based test to your app's tests module
|
|
(for example: ``myapp/tests.py``). For this example, we'll assume you're using
|
|
the :mod:`~django.contrib.staticfiles` app and want to have static files served
|
|
during the execution of your tests similar to what we get at development time
|
|
with ``DEBUG=True``, i.e. without having to collect them using
|
|
:djadmin:`collectstatic`. We'll use
|
|
the :class:`~django.contrib.staticfiles.testing.StaticLiveServerTestCase`
|
|
subclass which provides that functionality. Replace it with
|
|
``django.test.LiveServerTestCase`` if you don't need that.
|
|
|
|
The code for this test may look as follows::
|
|
|
|
from django.contrib.staticfiles.testing import StaticLiveServerTestCase
|
|
from selenium.webdriver.common.by import By
|
|
from selenium.webdriver.firefox.webdriver import WebDriver
|
|
|
|
class MySeleniumTests(StaticLiveServerTestCase):
|
|
fixtures = ['user-data.json']
|
|
|
|
@classmethod
|
|
def setUpClass(cls):
|
|
super().setUpClass()
|
|
cls.selenium = WebDriver()
|
|
cls.selenium.implicitly_wait(10)
|
|
|
|
@classmethod
|
|
def tearDownClass(cls):
|
|
cls.selenium.quit()
|
|
super().tearDownClass()
|
|
|
|
def test_login(self):
|
|
self.selenium.get(f'{self.live_server_url}/login/')
|
|
username_input = self.selenium.find_element(By.NAME, "username")
|
|
username_input.send_keys('myuser')
|
|
password_input = self.selenium.find_element(By.NAME, "password")
|
|
password_input.send_keys('secret')
|
|
self.selenium.find_element(By.XPATH, '//input[@value="Log in"]').click()
|
|
|
|
Finally, you may run the test as follows:
|
|
|
|
.. console::
|
|
|
|
$ ./manage.py test myapp.tests.MySeleniumTests.test_login
|
|
|
|
This example will automatically open Firefox then go to the login page, enter
|
|
the credentials and press the "Log in" button. Selenium offers other drivers in
|
|
case you do not have Firefox installed or wish to use another browser. The
|
|
example above is just a tiny fraction of what the Selenium client can do; check
|
|
out the `full reference`_ for more details.
|
|
|
|
.. _Selenium: https://www.selenium.dev/
|
|
.. _selenium package: https://pypi.org/project/selenium/
|
|
.. _full reference: https://selenium-python.readthedocs.io/api.html
|
|
.. _Firefox: https://www.mozilla.com/firefox/
|
|
|
|
.. note::
|
|
|
|
When using an in-memory SQLite database to run the tests, the same database
|
|
connection will be shared by two threads in parallel: the thread in which
|
|
the live server is run and the thread in which the test case is run. It's
|
|
important to prevent simultaneous database queries via this shared
|
|
connection by the two threads, as that may sometimes randomly cause the
|
|
tests to fail. So you need to ensure that the two threads don't access the
|
|
database at the same time. In particular, this means that in some cases
|
|
(for example, just after clicking a link or submitting a form), you might
|
|
need to check that a response is received by Selenium and that the next
|
|
page is loaded before proceeding with further test execution.
|
|
Do this, for example, by making Selenium wait until the ``<body>`` HTML tag
|
|
is found in the response (requires Selenium > 2.13)::
|
|
|
|
def test_login(self):
|
|
from selenium.webdriver.support.wait import WebDriverWait
|
|
timeout = 2
|
|
...
|
|
self.selenium.find_element(By.XPATH, '//input[@value="Log in"]').click()
|
|
# Wait until the response is received
|
|
WebDriverWait(self.selenium, timeout).until(
|
|
lambda driver: driver.find_element(By.TAG_NAME, 'body'))
|
|
|
|
The tricky thing here is that there's really no such thing as a "page load,"
|
|
especially in modern web apps that generate HTML dynamically after the
|
|
server generates the initial document. So, checking for the presence of
|
|
``<body>`` in the response might not necessarily be appropriate for all use
|
|
cases. Please refer to the `Selenium FAQ`_ and `Selenium documentation`_
|
|
for more information.
|
|
|
|
.. _Selenium FAQ: https://web.archive.org/web/20160129132110/http://code.google.com/p/selenium/wiki/FrequentlyAskedQuestions#Q:_WebDriver_fails_to_find_elements_/_Does_not_block_on_page_loa
|
|
.. _Selenium documentation: https://www.selenium.dev/documentation/webdriver/waits/#explicit-wait
|
|
|
|
Test cases features
|
|
===================
|
|
|
|
Default test client
|
|
-------------------
|
|
|
|
.. attribute:: SimpleTestCase.client
|
|
|
|
Every test case in a ``django.test.*TestCase`` instance has access to an
|
|
instance of a Django test client. This client can be accessed as
|
|
``self.client``. This client is recreated for each test, so you don't have to
|
|
worry about state (such as cookies) carrying over from one test to another.
|
|
|
|
This means, instead of instantiating a ``Client`` in each test::
|
|
|
|
import unittest
|
|
from django.test import Client
|
|
|
|
class SimpleTest(unittest.TestCase):
|
|
def test_details(self):
|
|
client = Client()
|
|
response = client.get('/customer/details/')
|
|
self.assertEqual(response.status_code, 200)
|
|
|
|
def test_index(self):
|
|
client = Client()
|
|
response = client.get('/customer/index/')
|
|
self.assertEqual(response.status_code, 200)
|
|
|
|
...you can refer to ``self.client``, like so::
|
|
|
|
from django.test import TestCase
|
|
|
|
class SimpleTest(TestCase):
|
|
def test_details(self):
|
|
response = self.client.get('/customer/details/')
|
|
self.assertEqual(response.status_code, 200)
|
|
|
|
def test_index(self):
|
|
response = self.client.get('/customer/index/')
|
|
self.assertEqual(response.status_code, 200)
|
|
|
|
Customizing the test client
|
|
---------------------------
|
|
|
|
.. attribute:: SimpleTestCase.client_class
|
|
|
|
If you want to use a different ``Client`` class (for example, a subclass
|
|
with customized behavior), use the :attr:`~SimpleTestCase.client_class` class
|
|
attribute::
|
|
|
|
from django.test import Client, TestCase
|
|
|
|
class MyTestClient(Client):
|
|
# Specialized methods for your environment
|
|
...
|
|
|
|
class MyTest(TestCase):
|
|
client_class = MyTestClient
|
|
|
|
def test_my_stuff(self):
|
|
# Here self.client is an instance of MyTestClient...
|
|
call_some_test_code()
|
|
|
|
.. _topics-testing-fixtures:
|
|
|
|
Fixture loading
|
|
---------------
|
|
|
|
.. attribute:: TransactionTestCase.fixtures
|
|
|
|
A test case for a database-backed website isn't much use if there isn't any
|
|
data in the database. Tests are more readable and it's more maintainable to
|
|
create objects using the ORM, for example in :meth:`TestCase.setUpTestData`,
|
|
however, you can also use :ref:`fixtures <fixtures-explanation>`.
|
|
|
|
A fixture is a collection of data that Django knows how to import into a
|
|
database. For example, if your site has user accounts, you might set up a
|
|
fixture of fake user accounts in order to populate your database during tests.
|
|
|
|
The most straightforward way of creating a fixture is to use the
|
|
:djadmin:`manage.py dumpdata <dumpdata>` command. This assumes you
|
|
already have some data in your database. See the :djadmin:`dumpdata
|
|
documentation<dumpdata>` for more details.
|
|
|
|
Once you've created a fixture and placed it in a ``fixtures`` directory in one
|
|
of your :setting:`INSTALLED_APPS`, you can use it in your unit tests by
|
|
specifying a ``fixtures`` class attribute on your :class:`django.test.TestCase`
|
|
subclass::
|
|
|
|
from django.test import TestCase
|
|
from myapp.models import Animal
|
|
|
|
class AnimalTestCase(TestCase):
|
|
fixtures = ['mammals.json', 'birds']
|
|
|
|
def setUp(self):
|
|
# Test definitions as before.
|
|
call_setup_methods()
|
|
|
|
def test_fluffy_animals(self):
|
|
# A test that uses the fixtures.
|
|
call_some_test_code()
|
|
|
|
Here's specifically what will happen:
|
|
|
|
* At the start of each test, before ``setUp()`` is run, Django will flush the
|
|
database, returning the database to the state it was in directly after
|
|
:djadmin:`migrate` was called.
|
|
|
|
* Then, all the named fixtures are installed. In this example, Django will
|
|
install any JSON fixture named ``mammals``, followed by any fixture named
|
|
``birds``. See the :ref:`fixtures-explanation` topic for more details on
|
|
defining and installing fixtures.
|
|
|
|
For performance reasons, :class:`TestCase` loads fixtures once for the entire
|
|
test class, before :meth:`~TestCase.setUpTestData`, instead of before each
|
|
test, and it uses transactions to clean the database before each test. In any case,
|
|
you can be certain that the outcome of a test will not be affected by another
|
|
test or by the order of test execution.
|
|
|
|
By default, fixtures are only loaded into the ``default`` database. If you are
|
|
using multiple databases and set :attr:`TransactionTestCase.databases`,
|
|
fixtures will be loaded into all specified databases.
|
|
|
|
URLconf configuration
|
|
---------------------
|
|
|
|
If your application provides views, you may want to include tests that use the
|
|
test client to exercise those views. However, an end user is free to deploy the
|
|
views in your application at any URL of their choosing. This means that your
|
|
tests can't rely upon the fact that your views will be available at a
|
|
particular URL. Decorate your test class or test method with
|
|
``@override_settings(ROOT_URLCONF=...)`` for URLconf configuration.
|
|
|
|
.. _testing-multi-db:
|
|
|
|
Multi-database support
|
|
----------------------
|
|
|
|
.. attribute:: TransactionTestCase.databases
|
|
|
|
Django sets up a test database corresponding to every database that is
|
|
defined in the :setting:`DATABASES` definition in your settings and referred to
|
|
by at least one test through ``databases``.
|
|
|
|
However, a big part of the time taken to run a Django ``TestCase`` is consumed
|
|
by the call to ``flush`` that ensures that you have a clean database at the
|
|
start of each test run. If you have multiple databases, multiple flushes are
|
|
required (one for each database), which can be a time consuming activity --
|
|
especially if your tests don't need to test multi-database activity.
|
|
|
|
As an optimization, Django only flushes the ``default`` database at
|
|
the start of each test run. If your setup contains multiple databases,
|
|
and you have a test that requires every database to be clean, you can
|
|
use the ``databases`` attribute on the test suite to request extra databases
|
|
to be flushed.
|
|
|
|
For example::
|
|
|
|
class TestMyViews(TransactionTestCase):
|
|
databases = {'default', 'other'}
|
|
|
|
def test_index_page_view(self):
|
|
call_some_test_code()
|
|
|
|
This test case will flush the ``default`` and ``other`` test databases before
|
|
running ``test_index_page_view``. You can also use ``'__all__'`` to specify
|
|
that all of the test databases must be flushed.
|
|
|
|
The ``databases`` flag also controls which databases the
|
|
:attr:`TransactionTestCase.fixtures` are loaded into. By default, fixtures are
|
|
only loaded into the ``default`` database.
|
|
|
|
Queries against databases not in ``databases`` will give assertion errors to
|
|
prevent state leaking between tests.
|
|
|
|
.. attribute:: TestCase.databases
|
|
|
|
By default, only the ``default`` database will be wrapped in a transaction
|
|
during a ``TestCase``'s execution and attempts to query other databases will
|
|
result in assertion errors to prevent state leaking between tests.
|
|
|
|
Use the ``databases`` class attribute on the test class to request transaction
|
|
wrapping against non-``default`` databases.
|
|
|
|
For example::
|
|
|
|
class OtherDBTests(TestCase):
|
|
databases = {'other'}
|
|
|
|
def test_other_db_query(self):
|
|
...
|
|
|
|
This test will only allow queries against the ``other`` database. Just like for
|
|
:attr:`SimpleTestCase.databases` and :attr:`TransactionTestCase.databases`, the
|
|
``'__all__'`` constant can be used to specify that the test should allow
|
|
queries to all databases.
|
|
|
|
.. _overriding-settings:
|
|
|
|
Overriding settings
|
|
-------------------
|
|
|
|
.. warning::
|
|
|
|
Use the functions below to temporarily alter the value of settings in tests.
|
|
Don't manipulate ``django.conf.settings`` directly as Django won't restore
|
|
the original values after such manipulations.
|
|
|
|
.. method:: SimpleTestCase.settings()
|
|
|
|
For testing purposes it's often useful to change a setting temporarily and
|
|
revert to the original value after running the testing code. For this use case
|
|
Django provides a standard Python context manager (see :pep:`343`) called
|
|
:meth:`~django.test.SimpleTestCase.settings`, which can be used like this::
|
|
|
|
from django.test import TestCase
|
|
|
|
class LoginTestCase(TestCase):
|
|
|
|
def test_login(self):
|
|
|
|
# First check for the default behavior
|
|
response = self.client.get('/sekrit/')
|
|
self.assertRedirects(response, '/accounts/login/?next=/sekrit/')
|
|
|
|
# Then override the LOGIN_URL setting
|
|
with self.settings(LOGIN_URL='/other/login/'):
|
|
response = self.client.get('/sekrit/')
|
|
self.assertRedirects(response, '/other/login/?next=/sekrit/')
|
|
|
|
This example will override the :setting:`LOGIN_URL` setting for the code
|
|
in the ``with`` block and reset its value to the previous state afterward.
|
|
|
|
.. method:: SimpleTestCase.modify_settings()
|
|
|
|
It can prove unwieldy to redefine settings that contain a list of values. In
|
|
practice, adding or removing values is often sufficient. Django provides the
|
|
:meth:`~django.test.SimpleTestCase.modify_settings` context manager for easier
|
|
settings changes::
|
|
|
|
from django.test import TestCase
|
|
|
|
class MiddlewareTestCase(TestCase):
|
|
|
|
def test_cache_middleware(self):
|
|
with self.modify_settings(MIDDLEWARE={
|
|
'append': 'django.middleware.cache.FetchFromCacheMiddleware',
|
|
'prepend': 'django.middleware.cache.UpdateCacheMiddleware',
|
|
'remove': [
|
|
'django.contrib.sessions.middleware.SessionMiddleware',
|
|
'django.contrib.auth.middleware.AuthenticationMiddleware',
|
|
'django.contrib.messages.middleware.MessageMiddleware',
|
|
],
|
|
}):
|
|
response = self.client.get('/')
|
|
# ...
|
|
|
|
For each action, you can supply either a list of values or a string. When the
|
|
value already exists in the list, ``append`` and ``prepend`` have no effect;
|
|
neither does ``remove`` when the value doesn't exist.
|
|
|
|
.. function:: override_settings(**kwargs)
|
|
|
|
In case you want to override a setting for a test method, Django provides the
|
|
:func:`~django.test.override_settings` decorator (see :pep:`318`). It's used
|
|
like this::
|
|
|
|
from django.test import TestCase, override_settings
|
|
|
|
class LoginTestCase(TestCase):
|
|
|
|
@override_settings(LOGIN_URL='/other/login/')
|
|
def test_login(self):
|
|
response = self.client.get('/sekrit/')
|
|
self.assertRedirects(response, '/other/login/?next=/sekrit/')
|
|
|
|
The decorator can also be applied to :class:`~django.test.TestCase` classes::
|
|
|
|
from django.test import TestCase, override_settings
|
|
|
|
@override_settings(LOGIN_URL='/other/login/')
|
|
class LoginTestCase(TestCase):
|
|
|
|
def test_login(self):
|
|
response = self.client.get('/sekrit/')
|
|
self.assertRedirects(response, '/other/login/?next=/sekrit/')
|
|
|
|
.. function:: modify_settings(*args, **kwargs)
|
|
|
|
Likewise, Django provides the :func:`~django.test.modify_settings`
|
|
decorator::
|
|
|
|
from django.test import TestCase, modify_settings
|
|
|
|
class MiddlewareTestCase(TestCase):
|
|
|
|
@modify_settings(MIDDLEWARE={
|
|
'append': 'django.middleware.cache.FetchFromCacheMiddleware',
|
|
'prepend': 'django.middleware.cache.UpdateCacheMiddleware',
|
|
})
|
|
def test_cache_middleware(self):
|
|
response = self.client.get('/')
|
|
# ...
|
|
|
|
The decorator can also be applied to test case classes::
|
|
|
|
from django.test import TestCase, modify_settings
|
|
|
|
@modify_settings(MIDDLEWARE={
|
|
'append': 'django.middleware.cache.FetchFromCacheMiddleware',
|
|
'prepend': 'django.middleware.cache.UpdateCacheMiddleware',
|
|
})
|
|
class MiddlewareTestCase(TestCase):
|
|
|
|
def test_cache_middleware(self):
|
|
response = self.client.get('/')
|
|
# ...
|
|
|
|
.. note::
|
|
|
|
When given a class, these decorators modify the class directly and return
|
|
it; they don't create and return a modified copy of it. So if you try to
|
|
tweak the above examples to assign the return value to a different name
|
|
than ``LoginTestCase`` or ``MiddlewareTestCase``, you may be surprised to
|
|
find that the original test case classes are still equally affected by the
|
|
decorator. For a given class, :func:`~django.test.modify_settings` is
|
|
always applied after :func:`~django.test.override_settings`.
|
|
|
|
.. warning::
|
|
|
|
The settings file contains some settings that are only consulted during
|
|
initialization of Django internals. If you change them with
|
|
``override_settings``, the setting is changed if you access it via the
|
|
``django.conf.settings`` module, however, Django's internals access it
|
|
differently. Effectively, using :func:`~django.test.override_settings` or
|
|
:func:`~django.test.modify_settings` with these settings is probably not
|
|
going to do what you expect it to do.
|
|
|
|
We do not recommend altering the :setting:`DATABASES` setting. Altering
|
|
the :setting:`CACHES` setting is possible, but a bit tricky if you are
|
|
using internals that make using of caching, like
|
|
:mod:`django.contrib.sessions`. For example, you will have to reinitialize
|
|
the session backend in a test that uses cached sessions and overrides
|
|
:setting:`CACHES`.
|
|
|
|
Finally, avoid aliasing your settings as module-level constants as
|
|
``override_settings()`` won't work on such values since they are
|
|
only evaluated the first time the module is imported.
|
|
|
|
You can also simulate the absence of a setting by deleting it after settings
|
|
have been overridden, like this::
|
|
|
|
@override_settings()
|
|
def test_something(self):
|
|
del settings.LOGIN_URL
|
|
...
|
|
|
|
When overriding settings, make sure to handle the cases in which your app's
|
|
code uses a cache or similar feature that retains state even if the setting is
|
|
changed. Django provides the :data:`django.test.signals.setting_changed`
|
|
signal that lets you register callbacks to clean up and otherwise reset state
|
|
when settings are changed.
|
|
|
|
Django itself uses this signal to reset various data:
|
|
|
|
============================================================================ ========================
|
|
Overridden settings Data reset
|
|
============================================================================ ========================
|
|
USE_TZ, TIME_ZONE Databases timezone
|
|
TEMPLATES Template engines
|
|
SERIALIZATION_MODULES Serializers cache
|
|
LOCALE_PATHS, LANGUAGE_CODE Default translation and loaded translations
|
|
DEFAULT_FILE_STORAGE, STATICFILES_STORAGE, STATIC_ROOT, STATIC_URL, STORAGES Storages configuration
|
|
============================================================================ ========================
|
|
|
|
Isolating apps
|
|
--------------
|
|
|
|
.. function:: utils.isolate_apps(*app_labels, attr_name=None, kwarg_name=None)
|
|
|
|
Registers the models defined within a wrapped context into their own
|
|
isolated :attr:`~django.apps.apps` registry. This functionality is useful
|
|
when creating model classes for tests, as the classes will be cleanly
|
|
deleted afterward, and there is no risk of name collisions.
|
|
|
|
The app labels which the isolated registry should contain must be passed as
|
|
individual arguments. You can use ``isolate_apps()`` as a decorator or a
|
|
context manager. For example::
|
|
|
|
from django.db import models
|
|
from django.test import SimpleTestCase
|
|
from django.test.utils import isolate_apps
|
|
|
|
class MyModelTests(SimpleTestCase):
|
|
|
|
@isolate_apps("app_label")
|
|
def test_model_definition(self):
|
|
class TestModel(models.Model):
|
|
pass
|
|
...
|
|
|
|
… or::
|
|
|
|
with isolate_apps("app_label"):
|
|
class TestModel(models.Model):
|
|
pass
|
|
...
|
|
|
|
The decorator form can also be applied to classes.
|
|
|
|
Two optional keyword arguments can be specified:
|
|
|
|
* ``attr_name``: attribute assigned the isolated registry if used as a
|
|
class decorator.
|
|
* ``kwarg_name``: keyword argument passing the isolated registry if used as
|
|
a function decorator.
|
|
|
|
The temporary ``Apps`` instance used to isolate model registration can be
|
|
retrieved as an attribute when used as a class decorator by using the
|
|
``attr_name`` parameter::
|
|
|
|
@isolate_apps("app_label", attr_name="apps")
|
|
class TestModelDefinition(SimpleTestCase):
|
|
def test_model_definition(self):
|
|
class TestModel(models.Model):
|
|
pass
|
|
self.assertIs(self.apps.get_model("app_label", "TestModel"), TestModel)
|
|
|
|
… or alternatively as an argument on the test method when used as a method
|
|
decorator by using the ``kwarg_name`` parameter::
|
|
|
|
class TestModelDefinition(SimpleTestCase):
|
|
@isolate_apps("app_label", kwarg_name="apps")
|
|
def test_model_definition(self, apps):
|
|
class TestModel(models.Model):
|
|
pass
|
|
self.assertIs(apps.get_model("app_label", "TestModel"), TestModel)
|
|
|
|
.. _emptying-test-outbox:
|
|
|
|
Emptying the test outbox
|
|
------------------------
|
|
|
|
If you use any of Django's custom ``TestCase`` classes, the test runner will
|
|
clear the contents of the test email outbox at the start of each test case.
|
|
|
|
For more detail on email services during tests, see `Email services`_ below.
|
|
|
|
.. _assertions:
|
|
|
|
Assertions
|
|
----------
|
|
|
|
As Python's normal :class:`unittest.TestCase` class implements assertion methods
|
|
such as :meth:`~unittest.TestCase.assertTrue` and
|
|
:meth:`~unittest.TestCase.assertEqual`, Django's custom :class:`TestCase` class
|
|
provides a number of custom assertion methods that are useful for testing web
|
|
applications:
|
|
|
|
The failure messages given by most of these assertion methods can be customized
|
|
with the ``msg_prefix`` argument. This string will be prefixed to any failure
|
|
message generated by the assertion. This allows you to provide additional
|
|
details that may help you to identify the location and cause of a failure in
|
|
your test suite.
|
|
|
|
.. method:: SimpleTestCase.assertRaisesMessage(expected_exception, expected_message, callable, *args, **kwargs)
|
|
SimpleTestCase.assertRaisesMessage(expected_exception, expected_message)
|
|
|
|
Asserts that execution of ``callable`` raises ``expected_exception`` and
|
|
that ``expected_message`` is found in the exception's message. Any other
|
|
outcome is reported as a failure. It's a simpler version of
|
|
:meth:`unittest.TestCase.assertRaisesRegex` with the difference that
|
|
``expected_message`` isn't treated as a regular expression.
|
|
|
|
If only the ``expected_exception`` and ``expected_message`` parameters are
|
|
given, returns a context manager so that the code being tested can be
|
|
written inline rather than as a function::
|
|
|
|
with self.assertRaisesMessage(ValueError, 'invalid literal for int()'):
|
|
int('a')
|
|
|
|
.. method:: SimpleTestCase.assertWarnsMessage(expected_warning, expected_message, callable, *args, **kwargs)
|
|
SimpleTestCase.assertWarnsMessage(expected_warning, expected_message)
|
|
|
|
Analogous to :meth:`SimpleTestCase.assertRaisesMessage` but for
|
|
:meth:`~unittest.TestCase.assertWarnsRegex` instead of
|
|
:meth:`~unittest.TestCase.assertRaisesRegex`.
|
|
|
|
.. method:: SimpleTestCase.assertFieldOutput(fieldclass, valid, invalid, field_args=None, field_kwargs=None, empty_value='')
|
|
|
|
Asserts that a form field behaves correctly with various inputs.
|
|
|
|
:param fieldclass: the class of the field to be tested.
|
|
:param valid: a dictionary mapping valid inputs to their expected cleaned
|
|
values.
|
|
:param invalid: a dictionary mapping invalid inputs to one or more raised
|
|
error messages.
|
|
:param field_args: the args passed to instantiate the field.
|
|
:param field_kwargs: the kwargs passed to instantiate the field.
|
|
:param empty_value: the expected clean output for inputs in ``empty_values``.
|
|
|
|
For example, the following code tests that an ``EmailField`` accepts
|
|
``a@a.com`` as a valid email address, but rejects ``aaa`` with a reasonable
|
|
error message::
|
|
|
|
self.assertFieldOutput(EmailField, {'a@a.com': 'a@a.com'}, {'aaa': ['Enter a valid email address.']})
|
|
|
|
.. method:: SimpleTestCase.assertFormError(form, field, errors, msg_prefix='')
|
|
|
|
Asserts that a field on a form raises the provided list of errors.
|
|
|
|
``form`` is a ``Form`` instance. The form must be
|
|
:ref:`bound <ref-forms-api-bound-unbound>` but not necessarily
|
|
validated (``assertFormError()`` will automatically call ``full_clean()``
|
|
on the form).
|
|
|
|
``field`` is the name of the field on the form to check. To check the form's
|
|
:meth:`non-field errors <django.forms.Form.non_field_errors>`, use
|
|
``field=None``.
|
|
|
|
``errors`` is a list of all the error strings that the field is expected to
|
|
have. You can also pass a single error string if you only expect one error
|
|
which means that ``errors='error message'`` is the same as
|
|
``errors=['error message']``.
|
|
|
|
.. versionchanged:: 4.1
|
|
|
|
In older versions, using an empty error list with ``assertFormError()``
|
|
would always pass, regardless of whether the field had any errors or
|
|
not. Starting from Django 4.1, using ``errors=[]`` will only pass if
|
|
the field actually has no errors.
|
|
|
|
Django 4.1 also changed the behavior of ``assertFormError()`` when a
|
|
field has multiple errors. In older versions, if a field had multiple
|
|
errors and you checked for only some of them, the test would pass.
|
|
Starting from Django 4.1, the error list must be an exact match to the
|
|
field's actual errors.
|
|
|
|
.. deprecated:: 4.1
|
|
|
|
Support for passing a response object and a form name to
|
|
``assertFormError()`` is deprecated and will be removed in Django 5.0.
|
|
Use the form instance directly instead.
|
|
|
|
.. method:: SimpleTestCase.assertFormSetError(formset, form_index, field, errors, msg_prefix='')
|
|
|
|
Asserts that the ``formset`` raises the provided list of errors when
|
|
rendered.
|
|
|
|
``formset`` is a ``FormSet`` instance. The formset must be bound but not
|
|
necessarily validated (``assertFormSetError()`` will automatically call the
|
|
``full_clean()`` on the formset).
|
|
|
|
``form_index`` is the number of the form within the ``FormSet`` (starting
|
|
from 0). Use ``form_index=None`` to check the formset's non-form errors,
|
|
i.e. the errors you get when calling ``formset.non_form_errors()``. In that
|
|
case you must also use ``field=None``.
|
|
|
|
``field`` and ``errors`` have the same meaning as the parameters to
|
|
``assertFormError()``.
|
|
|
|
.. deprecated:: 4.1
|
|
|
|
Support for passing a response object and a formset name to
|
|
``assertFormSetError()`` is deprecated and will be removed in Django
|
|
5.0. Use the formset instance directly instead.
|
|
|
|
.. deprecated:: 4.2
|
|
|
|
The ``assertFormsetError()`` assertion method is deprecated. Use
|
|
``assertFormSetError()`` instead.
|
|
|
|
.. method:: SimpleTestCase.assertContains(response, text, count=None, status_code=200, msg_prefix='', html=False)
|
|
|
|
Asserts that a :class:`response <django.http.HttpResponse>` produced the
|
|
given :attr:`~django.http.HttpResponse.status_code` and that ``text``
|
|
appears in its :attr:`~django.http.HttpResponse.content`. If ``count``
|
|
is provided, ``text`` must occur exactly ``count`` times in the response.
|
|
|
|
Set ``html`` to ``True`` to handle ``text`` as HTML. The comparison with
|
|
the response content will be based on HTML semantics instead of
|
|
character-by-character equality. Whitespace is ignored in most cases,
|
|
attribute ordering is not significant. See
|
|
:meth:`~SimpleTestCase.assertHTMLEqual` for more details.
|
|
|
|
.. method:: SimpleTestCase.assertNotContains(response, text, status_code=200, msg_prefix='', html=False)
|
|
|
|
Asserts that a :class:`response <django.http.HttpResponse>` produced the
|
|
given :attr:`~django.http.HttpResponse.status_code` and that ``text`` does
|
|
*not* appear in its :attr:`~django.http.HttpResponse.content`.
|
|
|
|
Set ``html`` to ``True`` to handle ``text`` as HTML. The comparison with
|
|
the response content will be based on HTML semantics instead of
|
|
character-by-character equality. Whitespace is ignored in most cases,
|
|
attribute ordering is not significant. See
|
|
:meth:`~SimpleTestCase.assertHTMLEqual` for more details.
|
|
|
|
.. method:: SimpleTestCase.assertTemplateUsed(response, template_name, msg_prefix='', count=None)
|
|
|
|
Asserts that the template with the given name was used in rendering the
|
|
response.
|
|
|
|
``response`` must be a response instance returned by the
|
|
:class:`test client <django.test.Response>`.
|
|
|
|
``template_name`` should be a string such as ``'admin/index.html'``.
|
|
|
|
The ``count`` argument is an integer indicating the number of times the
|
|
template should be rendered. Default is ``None``, meaning that the template
|
|
should be rendered one or more times.
|
|
|
|
You can use this as a context manager, like this::
|
|
|
|
with self.assertTemplateUsed('index.html'):
|
|
render_to_string('index.html')
|
|
with self.assertTemplateUsed(template_name='index.html'):
|
|
render_to_string('index.html')
|
|
|
|
.. method:: SimpleTestCase.assertTemplateNotUsed(response, template_name, msg_prefix='')
|
|
|
|
Asserts that the template with the given name was *not* used in rendering
|
|
the response.
|
|
|
|
You can use this as a context manager in the same way as
|
|
:meth:`~SimpleTestCase.assertTemplateUsed`.
|
|
|
|
.. method:: SimpleTestCase.assertURLEqual(url1, url2, msg_prefix='')
|
|
|
|
Asserts that two URLs are the same, ignoring the order of query string
|
|
parameters except for parameters with the same name. For example,
|
|
``/path/?x=1&y=2`` is equal to ``/path/?y=2&x=1``, but
|
|
``/path/?a=1&a=2`` isn't equal to ``/path/?a=2&a=1``.
|
|
|
|
.. method:: SimpleTestCase.assertRedirects(response, expected_url, status_code=302, target_status_code=200, msg_prefix='', fetch_redirect_response=True)
|
|
|
|
Asserts that the :class:`response <django.http.HttpResponse>` returned a
|
|
:attr:`~django.http.HttpResponse.status_code` redirect status, redirected
|
|
to ``expected_url`` (including any ``GET`` data), and that the final page
|
|
was received with ``target_status_code``.
|
|
|
|
If your request used the ``follow`` argument, the ``expected_url`` and
|
|
``target_status_code`` will be the url and status code for the final
|
|
point of the redirect chain.
|
|
|
|
If ``fetch_redirect_response`` is ``False``, the final page won't be
|
|
loaded. Since the test client can't fetch external URLs, this is
|
|
particularly useful if ``expected_url`` isn't part of your Django app.
|
|
|
|
Scheme is handled correctly when making comparisons between two URLs. If
|
|
there isn't any scheme specified in the location where we are redirected to,
|
|
the original request's scheme is used. If present, the scheme in
|
|
``expected_url`` is the one used to make the comparisons to.
|
|
|
|
.. method:: SimpleTestCase.assertHTMLEqual(html1, html2, msg=None)
|
|
|
|
Asserts that the strings ``html1`` and ``html2`` are equal. The comparison
|
|
is based on HTML semantics. The comparison takes following things into
|
|
account:
|
|
|
|
* Whitespace before and after HTML tags is ignored.
|
|
* All types of whitespace are considered equivalent.
|
|
* All open tags are closed implicitly, e.g. when a surrounding tag is
|
|
closed or the HTML document ends.
|
|
* Empty tags are equivalent to their self-closing version.
|
|
* The ordering of attributes of an HTML element is not significant.
|
|
* Boolean attributes (like ``checked``) without an argument are equal to
|
|
attributes that equal in name and value (see the examples).
|
|
* Text, character references, and entity references that refer to the same
|
|
character are equivalent.
|
|
|
|
The following examples are valid tests and don't raise any
|
|
``AssertionError``::
|
|
|
|
self.assertHTMLEqual(
|
|
'<p>Hello <b>'world'!</p>',
|
|
'''<p>
|
|
Hello <b>'world'! </b>
|
|
</p>'''
|
|
)
|
|
self.assertHTMLEqual(
|
|
'<input type="checkbox" checked="checked" id="id_accept_terms" />',
|
|
'<input id="id_accept_terms" type="checkbox" checked>'
|
|
)
|
|
|
|
``html1`` and ``html2`` must contain HTML. An ``AssertionError`` will be
|
|
raised if one of them cannot be parsed.
|
|
|
|
Output in case of error can be customized with the ``msg`` argument.
|
|
|
|
.. method:: SimpleTestCase.assertHTMLNotEqual(html1, html2, msg=None)
|
|
|
|
Asserts that the strings ``html1`` and ``html2`` are *not* equal. The
|
|
comparison is based on HTML semantics. See
|
|
:meth:`~SimpleTestCase.assertHTMLEqual` for details.
|
|
|
|
``html1`` and ``html2`` must contain HTML. An ``AssertionError`` will be
|
|
raised if one of them cannot be parsed.
|
|
|
|
Output in case of error can be customized with the ``msg`` argument.
|
|
|
|
.. method:: SimpleTestCase.assertXMLEqual(xml1, xml2, msg=None)
|
|
|
|
Asserts that the strings ``xml1`` and ``xml2`` are equal. The
|
|
comparison is based on XML semantics. Similarly to
|
|
:meth:`~SimpleTestCase.assertHTMLEqual`, the comparison is
|
|
made on parsed content, hence only semantic differences are considered, not
|
|
syntax differences. When invalid XML is passed in any parameter, an
|
|
``AssertionError`` is always raised, even if both strings are identical.
|
|
|
|
XML declaration, document type, processing instructions, and comments are
|
|
ignored. Only the root element and its children are compared.
|
|
|
|
Output in case of error can be customized with the ``msg`` argument.
|
|
|
|
.. method:: SimpleTestCase.assertXMLNotEqual(xml1, xml2, msg=None)
|
|
|
|
Asserts that the strings ``xml1`` and ``xml2`` are *not* equal. The
|
|
comparison is based on XML semantics. See
|
|
:meth:`~SimpleTestCase.assertXMLEqual` for details.
|
|
|
|
Output in case of error can be customized with the ``msg`` argument.
|
|
|
|
.. method:: SimpleTestCase.assertInHTML(needle, haystack, count=None, msg_prefix='')
|
|
|
|
Asserts that the HTML fragment ``needle`` is contained in the ``haystack``
|
|
once.
|
|
|
|
If the ``count`` integer argument is specified, then additionally the number
|
|
of ``needle`` occurrences will be strictly verified.
|
|
|
|
Whitespace in most cases is ignored, and attribute ordering is not
|
|
significant. See :meth:`~SimpleTestCase.assertHTMLEqual` for more details.
|
|
|
|
.. method:: SimpleTestCase.assertJSONEqual(raw, expected_data, msg=None)
|
|
|
|
Asserts that the JSON fragments ``raw`` and ``expected_data`` are equal.
|
|
Usual JSON non-significant whitespace rules apply as the heavyweight is
|
|
delegated to the :mod:`json` library.
|
|
|
|
Output in case of error can be customized with the ``msg`` argument.
|
|
|
|
.. method:: SimpleTestCase.assertJSONNotEqual(raw, expected_data, msg=None)
|
|
|
|
Asserts that the JSON fragments ``raw`` and ``expected_data`` are *not* equal.
|
|
See :meth:`~SimpleTestCase.assertJSONEqual` for further details.
|
|
|
|
Output in case of error can be customized with the ``msg`` argument.
|
|
|
|
.. method:: TransactionTestCase.assertQuerySetEqual(qs, values, transform=None, ordered=True, msg=None)
|
|
|
|
Asserts that a queryset ``qs`` matches a particular iterable of values
|
|
``values``.
|
|
|
|
If ``transform`` is provided, ``values`` is compared to a list produced by
|
|
applying ``transform`` to each member of ``qs``.
|
|
|
|
By default, the comparison is also ordering dependent. If ``qs`` doesn't
|
|
provide an implicit ordering, you can set the ``ordered`` parameter to
|
|
``False``, which turns the comparison into a ``collections.Counter`` comparison.
|
|
If the order is undefined (if the given ``qs`` isn't ordered and the
|
|
comparison is against more than one ordered value), a ``ValueError`` is
|
|
raised.
|
|
|
|
Output in case of error can be customized with the ``msg`` argument.
|
|
|
|
.. deprecated:: 4.2
|
|
|
|
The ``assertQuerysetEqual()`` assertion method is deprecated. Use
|
|
``assertQuerySetEqual()`` instead.
|
|
|
|
.. method:: TransactionTestCase.assertNumQueries(num, func, *args, **kwargs)
|
|
|
|
Asserts that when ``func`` is called with ``*args`` and ``**kwargs`` that
|
|
``num`` database queries are executed.
|
|
|
|
If a ``"using"`` key is present in ``kwargs`` it is used as the database
|
|
alias for which to check the number of queries::
|
|
|
|
self.assertNumQueries(7, using='non_default_db')
|
|
|
|
If you wish to call a function with a ``using`` parameter you can do it by
|
|
wrapping the call with a ``lambda`` to add an extra parameter::
|
|
|
|
self.assertNumQueries(7, lambda: my_function(using=7))
|
|
|
|
You can also use this as a context manager::
|
|
|
|
with self.assertNumQueries(2):
|
|
Person.objects.create(name="Aaron")
|
|
Person.objects.create(name="Daniel")
|
|
|
|
.. _topics-tagging-tests:
|
|
|
|
Tagging tests
|
|
-------------
|
|
|
|
You can tag your tests so you can easily run a particular subset. For example,
|
|
you might label fast or slow tests::
|
|
|
|
from django.test import tag
|
|
|
|
class SampleTestCase(TestCase):
|
|
|
|
@tag('fast')
|
|
def test_fast(self):
|
|
...
|
|
|
|
@tag('slow')
|
|
def test_slow(self):
|
|
...
|
|
|
|
@tag('slow', 'core')
|
|
def test_slow_but_core(self):
|
|
...
|
|
|
|
You can also tag a test case::
|
|
|
|
@tag('slow', 'core')
|
|
class SampleTestCase(TestCase):
|
|
...
|
|
|
|
Subclasses inherit tags from superclasses, and methods inherit tags from their
|
|
class. Given::
|
|
|
|
@tag('foo')
|
|
class SampleTestCaseChild(SampleTestCase):
|
|
|
|
@tag('bar')
|
|
def test(self):
|
|
...
|
|
|
|
``SampleTestCaseChild.test`` will be labeled with ``'slow'``, ``'core'``,
|
|
``'bar'``, and ``'foo'``.
|
|
|
|
Then you can choose which tests to run. For example, to run only fast tests:
|
|
|
|
.. console::
|
|
|
|
$ ./manage.py test --tag=fast
|
|
|
|
Or to run fast tests and the core one (even though it's slow):
|
|
|
|
.. console::
|
|
|
|
$ ./manage.py test --tag=fast --tag=core
|
|
|
|
You can also exclude tests by tag. To run core tests if they are not slow:
|
|
|
|
.. console::
|
|
|
|
$ ./manage.py test --tag=core --exclude-tag=slow
|
|
|
|
:option:`test --exclude-tag` has precedence over :option:`test --tag`, so if a
|
|
test has two tags and you select one of them and exclude the other, the test
|
|
won't be run.
|
|
|
|
.. _async-tests:
|
|
|
|
Testing asynchronous code
|
|
=========================
|
|
|
|
If you merely want to test the output of your asynchronous views, the standard
|
|
test client will run them inside their own asynchronous loop without any extra
|
|
work needed on your part.
|
|
|
|
However, if you want to write fully-asynchronous tests for a Django project,
|
|
you will need to take several things into account.
|
|
|
|
Firstly, your tests must be ``async def`` methods on the test class (in order
|
|
to give them an asynchronous context). Django will automatically detect
|
|
any ``async def`` tests and wrap them so they run in their own event loop.
|
|
|
|
If you are testing from an asynchronous function, you must also use the
|
|
asynchronous test client. This is available as ``django.test.AsyncClient``,
|
|
or as ``self.async_client`` on any test.
|
|
|
|
.. class:: AsyncClient(enforce_csrf_checks=False, raise_request_exception=True, *, headers=None, **defaults)
|
|
|
|
``AsyncClient`` has the same methods and signatures as the synchronous (normal)
|
|
test client, with two exceptions:
|
|
|
|
* In the initialization, arbitrary keyword arguments in ``defaults`` are added
|
|
directly into the ASGI scope.
|
|
* The ``follow`` parameter is not supported.
|
|
* Headers passed as ``extra`` keyword arguments should not have the ``HTTP_``
|
|
prefix required by the synchronous client (see :meth:`Client.get`). For
|
|
example, here is how to set an HTTP ``Accept`` header::
|
|
|
|
>>> c = AsyncClient()
|
|
>>> c.get(
|
|
... '/customers/details/',
|
|
... {'name': 'fred', 'age': 7},
|
|
... ACCEPT='application/json'
|
|
... )
|
|
|
|
.. versionchanged:: 4.2
|
|
|
|
The ``headers`` parameter was added.
|
|
|
|
Using ``AsyncClient`` any method that makes a request must be awaited::
|
|
|
|
async def test_my_thing(self):
|
|
response = await self.async_client.get('/some-url/')
|
|
self.assertEqual(response.status_code, 200)
|
|
|
|
The asynchronous client can also call synchronous views; it runs through
|
|
Django's :doc:`asynchronous request path </topics/async>`, which supports both.
|
|
Any view called through the ``AsyncClient`` will get an ``ASGIRequest`` object
|
|
for its ``request`` rather than the ``WSGIRequest`` that the normal client
|
|
creates.
|
|
|
|
.. warning::
|
|
|
|
If you are using test decorators, they must be async-compatible to ensure
|
|
they work correctly. Django's built-in decorators will behave correctly, but
|
|
third-party ones may appear to not execute (they will "wrap" the wrong part
|
|
of the execution flow and not your test).
|
|
|
|
If you need to use these decorators, then you should decorate your test
|
|
methods with :func:`~asgiref.sync.async_to_sync` *inside* of them instead::
|
|
|
|
from asgiref.sync import async_to_sync
|
|
from django.test import TestCase
|
|
|
|
class MyTests(TestCase):
|
|
|
|
@mock.patch(...)
|
|
@async_to_sync
|
|
async def test_my_thing(self):
|
|
...
|
|
|
|
.. _topics-testing-email:
|
|
|
|
Email services
|
|
==============
|
|
|
|
If any of your Django views send email using :doc:`Django's email
|
|
functionality </topics/email>`, you probably don't want to send email each time
|
|
you run a test using that view. For this reason, Django's test runner
|
|
automatically redirects all Django-sent email to a dummy outbox. This lets you
|
|
test every aspect of sending email -- from the number of messages sent to the
|
|
contents of each message -- without actually sending the messages.
|
|
|
|
The test runner accomplishes this by transparently replacing the normal
|
|
email backend with a testing backend.
|
|
(Don't worry -- this has no effect on any other email senders outside of
|
|
Django, such as your machine's mail server, if you're running one.)
|
|
|
|
.. currentmodule:: django.core.mail
|
|
|
|
.. data:: django.core.mail.outbox
|
|
|
|
During test running, each outgoing email is saved in
|
|
``django.core.mail.outbox``. This is a list of all
|
|
:class:`~django.core.mail.EmailMessage` instances that have been sent. The
|
|
``outbox`` attribute is a special attribute that is created *only* when the
|
|
``locmem`` email backend is used. It doesn't normally exist as part of the
|
|
:mod:`django.core.mail` module and you can't import it directly. The code below
|
|
shows how to access this attribute correctly.
|
|
|
|
Here's an example test that examines ``django.core.mail.outbox`` for length
|
|
and contents::
|
|
|
|
from django.core import mail
|
|
from django.test import TestCase
|
|
|
|
class EmailTest(TestCase):
|
|
def test_send_email(self):
|
|
# Send message.
|
|
mail.send_mail(
|
|
'Subject here', 'Here is the message.',
|
|
'from@example.com', ['to@example.com'],
|
|
fail_silently=False,
|
|
)
|
|
|
|
# Test that one message has been sent.
|
|
self.assertEqual(len(mail.outbox), 1)
|
|
|
|
# Verify that the subject of the first message is correct.
|
|
self.assertEqual(mail.outbox[0].subject, 'Subject here')
|
|
|
|
As noted :ref:`previously <emptying-test-outbox>`, the test outbox is emptied
|
|
at the start of every test in a Django ``*TestCase``. To empty the outbox
|
|
manually, assign the empty list to ``mail.outbox``::
|
|
|
|
from django.core import mail
|
|
|
|
# Empty the test outbox
|
|
mail.outbox = []
|
|
|
|
.. _topics-testing-management-commands:
|
|
|
|
Management Commands
|
|
===================
|
|
|
|
Management commands can be tested with the
|
|
:func:`~django.core.management.call_command` function. The output can be
|
|
redirected into a ``StringIO`` instance::
|
|
|
|
from io import StringIO
|
|
from django.core.management import call_command
|
|
from django.test import TestCase
|
|
|
|
class ClosepollTest(TestCase):
|
|
def test_command_output(self):
|
|
out = StringIO()
|
|
call_command('closepoll', stdout=out)
|
|
self.assertIn('Expected output', out.getvalue())
|
|
|
|
.. _skipping-tests:
|
|
|
|
Skipping tests
|
|
==============
|
|
|
|
.. currentmodule:: django.test
|
|
|
|
The unittest library provides the :func:`@skipIf <unittest.skipIf>` and
|
|
:func:`@skipUnless <unittest.skipUnless>` decorators to allow you to skip tests
|
|
if you know ahead of time that those tests are going to fail under certain
|
|
conditions.
|
|
|
|
For example, if your test requires a particular optional library in order to
|
|
succeed, you could decorate the test case with :func:`@skipIf
|
|
<unittest.skipIf>`. Then, the test runner will report that the test wasn't
|
|
executed and why, instead of failing the test or omitting the test altogether.
|
|
|
|
To supplement these test skipping behaviors, Django provides two
|
|
additional skip decorators. Instead of testing a generic boolean,
|
|
these decorators check the capabilities of the database, and skip the
|
|
test if the database doesn't support a specific named feature.
|
|
|
|
The decorators use a string identifier to describe database features.
|
|
This string corresponds to attributes of the database connection
|
|
features class. See
|
|
:source:`django.db.backends.base.features.BaseDatabaseFeatures class
|
|
<django/db/backends/base/features.py>` for a full list of database features
|
|
that can be used as a basis for skipping tests.
|
|
|
|
.. function:: skipIfDBFeature(*feature_name_strings)
|
|
|
|
Skip the decorated test or ``TestCase`` if all of the named database features
|
|
are supported.
|
|
|
|
For example, the following test will not be executed if the database
|
|
supports transactions (e.g., it would *not* run under PostgreSQL, but
|
|
it would under MySQL with MyISAM tables)::
|
|
|
|
class MyTests(TestCase):
|
|
@skipIfDBFeature('supports_transactions')
|
|
def test_transaction_behavior(self):
|
|
# ... conditional test code
|
|
pass
|
|
|
|
.. function:: skipUnlessDBFeature(*feature_name_strings)
|
|
|
|
Skip the decorated test or ``TestCase`` if any of the named database features
|
|
are *not* supported.
|
|
|
|
For example, the following test will only be executed if the database
|
|
supports transactions (e.g., it would run under PostgreSQL, but *not*
|
|
under MySQL with MyISAM tables)::
|
|
|
|
class MyTests(TestCase):
|
|
@skipUnlessDBFeature('supports_transactions')
|
|
def test_transaction_behavior(self):
|
|
# ... conditional test code
|
|
pass
|