from django.contrib.messages import Message, constants, get_level, set_level from django.contrib.messages.api import MessageFailure from django.contrib.messages.constants import DEFAULT_LEVELS from django.contrib.messages.storage import default_storage from django.http import HttpRequest, HttpResponse from django.test import modify_settings, override_settings from django.urls import reverse from django.utils.translation import gettext_lazy def add_level_messages(storage): """ Add 6 messages from different levels (including a custom one) to a storage instance. """ storage.add(constants.INFO, "A generic info message") storage.add(29, "Some custom level") storage.add(constants.DEBUG, "A debugging message", extra_tags="extra-tag") storage.add(constants.WARNING, "A warning") storage.add(constants.ERROR, "An error") storage.add(constants.SUCCESS, "This was a triumph.") class BaseTests: storage_class = default_storage levels = { "debug": constants.DEBUG, "info": constants.INFO, "success": constants.SUCCESS, "warning": constants.WARNING, "error": constants.ERROR, } def setUp(self): self.settings_override = override_settings( TEMPLATES=[ { "BACKEND": "django.template.backends.django.DjangoTemplates", "DIRS": [], "APP_DIRS": True, "OPTIONS": { "context_processors": ( "django.contrib.auth.context_processors.auth", "django.contrib.messages.context_processors.messages", ), }, } ], ROOT_URLCONF="messages_tests.urls", MESSAGE_TAGS={}, MESSAGE_STORAGE="%s.%s" % (self.storage_class.__module__, self.storage_class.__name__), SESSION_SERIALIZER="django.contrib.sessions.serializers.JSONSerializer", ) self.settings_override.enable() def tearDown(self): self.settings_override.disable() def get_request(self): return HttpRequest() def get_response(self): return HttpResponse() def get_storage(self, data=None): """ Return the storage backend, setting its loaded data to the ``data`` argument. This method avoids the storage ``_get`` method from getting called so that other parts of the storage backend can be tested independent of the message retrieval logic. """ storage = self.storage_class(self.get_request()) storage._loaded_data = data or [] return storage def test_repr(self): request = self.get_request() storage = self.storage_class(request) self.assertEqual( repr(storage), f"<{self.storage_class.__qualname__}: request=>", ) def test_add(self): storage = self.get_storage() self.assertFalse(storage.added_new) storage.add(constants.INFO, "Test message 1") self.assertTrue(storage.added_new) storage.add(constants.INFO, "Test message 2", extra_tags="tag") self.assertEqual(len(storage), 2) def test_add_lazy_translation(self): storage = self.get_storage() response = self.get_response() storage.add(constants.INFO, gettext_lazy("lazy message")) storage.update(response) storing = self.stored_messages_count(storage, response) self.assertEqual(storing, 1) def test_no_update(self): storage = self.get_storage() response = self.get_response() storage.update(response) storing = self.stored_messages_count(storage, response) self.assertEqual(storing, 0) def test_add_update(self): storage = self.get_storage() response = self.get_response() storage.add(constants.INFO, "Test message 1") storage.add(constants.INFO, "Test message 1", extra_tags="tag") storage.update(response) storing = self.stored_messages_count(storage, response) self.assertEqual(storing, 2) def test_existing_add_read_update(self): storage = self.get_existing_storage() response = self.get_response() storage.add(constants.INFO, "Test message 3") list(storage) # Simulates a read storage.update(response) storing = self.stored_messages_count(storage, response) self.assertEqual(storing, 0) def test_existing_read_add_update(self): storage = self.get_existing_storage() response = self.get_response() list(storage) # Simulates a read storage.add(constants.INFO, "Test message 3") storage.update(response) storing = self.stored_messages_count(storage, response) self.assertEqual(storing, 1) @override_settings(MESSAGE_LEVEL=constants.DEBUG) def test_full_request_response_cycle(self): """ With the message middleware enabled, messages are properly stored and retrieved across the full request/redirect/response cycle. """ data = { "messages": ["Test message %d" % x for x in range(5)], } show_url = reverse("show_message") for level in ("debug", "info", "success", "warning", "error"): add_url = reverse("add_message", args=(level,)) response = self.client.post(add_url, data, follow=True) self.assertRedirects(response, show_url) self.assertIn("messages", response.context) messages = [Message(self.levels[level], msg) for msg in data["messages"]] self.assertEqual(list(response.context["messages"]), messages) for msg in data["messages"]: self.assertContains(response, msg) @override_settings(MESSAGE_LEVEL=constants.DEBUG) def test_with_template_response(self): data = { "messages": ["Test message %d" % x for x in range(5)], } show_url = reverse("show_template_response") for level in self.levels: add_url = reverse("add_template_response", args=(level,)) response = self.client.post(add_url, data, follow=True) self.assertRedirects(response, show_url) self.assertIn("messages", response.context) for msg in data["messages"]: self.assertContains(response, msg) # there shouldn't be any messages on second GET request response = self.client.get(show_url) for msg in data["messages"]: self.assertNotContains(response, msg) def test_context_processor_message_levels(self): show_url = reverse("show_template_response") response = self.client.get(show_url) self.assertIn("DEFAULT_MESSAGE_LEVELS", response.context) self.assertEqual(response.context["DEFAULT_MESSAGE_LEVELS"], DEFAULT_LEVELS) @override_settings(MESSAGE_LEVEL=constants.DEBUG) def test_multiple_posts(self): """ Messages persist properly when multiple POSTs are made before a GET. """ data = { "messages": ["Test message %d" % x for x in range(5)], } show_url = reverse("show_message") messages = [] for level in ("debug", "info", "success", "warning", "error"): messages.extend( Message(self.levels[level], msg) for msg in data["messages"] ) add_url = reverse("add_message", args=(level,)) self.client.post(add_url, data) response = self.client.get(show_url) self.assertIn("messages", response.context) self.assertEqual(list(response.context["messages"]), messages) for msg in data["messages"]: self.assertContains(response, msg) @modify_settings( INSTALLED_APPS={"remove": "django.contrib.messages"}, MIDDLEWARE={"remove": "django.contrib.messages.middleware.MessageMiddleware"}, ) @override_settings( MESSAGE_LEVEL=constants.DEBUG, TEMPLATES=[ { "BACKEND": "django.template.backends.django.DjangoTemplates", "DIRS": [], "APP_DIRS": True, } ], ) def test_middleware_disabled(self): """ When the middleware is disabled, an exception is raised when one attempts to store a message. """ data = { "messages": ["Test message %d" % x for x in range(5)], } reverse("show_message") for level in ("debug", "info", "success", "warning", "error"): add_url = reverse("add_message", args=(level,)) with self.assertRaises(MessageFailure): self.client.post(add_url, data, follow=True) @modify_settings( INSTALLED_APPS={"remove": "django.contrib.messages"}, MIDDLEWARE={"remove": "django.contrib.messages.middleware.MessageMiddleware"}, ) @override_settings( TEMPLATES=[ { "BACKEND": "django.template.backends.django.DjangoTemplates", "DIRS": [], "APP_DIRS": True, } ], ) def test_middleware_disabled_fail_silently(self): """ When the middleware is disabled, an exception is not raised if 'fail_silently' is True. """ data = { "messages": ["Test message %d" % x for x in range(5)], "fail_silently": True, } show_url = reverse("show_message") for level in ("debug", "info", "success", "warning", "error"): add_url = reverse("add_message", args=(level,)) response = self.client.post(add_url, data, follow=True) self.assertRedirects(response, show_url) self.assertNotIn("messages", response.context) def stored_messages_count(self, storage, response): """ Return the number of messages being stored after a ``storage.update()`` call. """ raise NotImplementedError("This method must be set by a subclass.") def test_get(self): raise NotImplementedError("This method must be set by a subclass.") def get_existing_storage(self): return self.get_storage( [ Message(constants.INFO, "Test message 1"), Message(constants.INFO, "Test message 2", extra_tags="tag"), ] ) def test_existing_read(self): """ Reading the existing storage doesn't cause the data to be lost. """ storage = self.get_existing_storage() self.assertFalse(storage.used) # After iterating the storage engine directly, the used flag is set. data = list(storage) self.assertTrue(storage.used) # The data does not disappear because it has been iterated. self.assertEqual(data, list(storage)) def test_existing_add(self): storage = self.get_existing_storage() self.assertFalse(storage.added_new) storage.add(constants.INFO, "Test message 3") self.assertTrue(storage.added_new) def test_default_level(self): # get_level works even with no storage on the request. request = self.get_request() self.assertEqual(get_level(request), constants.INFO) # get_level returns the default level if it hasn't been set. storage = self.get_storage() request._messages = storage self.assertEqual(get_level(request), constants.INFO) # Only messages of sufficient level get recorded. add_level_messages(storage) self.assertEqual(len(storage), 5) def test_low_level(self): request = self.get_request() storage = self.storage_class(request) request._messages = storage self.assertTrue(set_level(request, 5)) self.assertEqual(get_level(request), 5) add_level_messages(storage) self.assertEqual(len(storage), 6) def test_high_level(self): request = self.get_request() storage = self.storage_class(request) request._messages = storage self.assertTrue(set_level(request, 30)) self.assertEqual(get_level(request), 30) add_level_messages(storage) self.assertEqual(len(storage), 2) @override_settings(MESSAGE_LEVEL=29) def test_settings_level(self): request = self.get_request() storage = self.storage_class(request) self.assertEqual(get_level(request), 29) add_level_messages(storage) self.assertEqual(len(storage), 3) def test_tags(self): storage = self.get_storage() storage.level = 0 add_level_messages(storage) storage.add(constants.INFO, "A generic info message", extra_tags=None) tags = [msg.tags for msg in storage] self.assertEqual( tags, ["info", "", "extra-tag debug", "warning", "error", "success", "info"] ) def test_level_tag(self): storage = self.get_storage() storage.level = 0 add_level_messages(storage) tags = [msg.level_tag for msg in storage] self.assertEqual(tags, ["info", "", "debug", "warning", "error", "success"]) @override_settings( MESSAGE_TAGS={ constants.INFO: "info", constants.DEBUG: "", constants.WARNING: "", constants.ERROR: "bad", 29: "custom", } ) def test_custom_tags(self): storage = self.get_storage() storage.level = 0 add_level_messages(storage) tags = [msg.tags for msg in storage] self.assertEqual(tags, ["info", "custom", "extra-tag", "", "bad", "success"])