[1.8.x] Moved contrib.messages tests out of contrib.

Backport of b3cd9e0d07 from master

tests/messages_tests/test_api.py

@@ -0,0 +1,54 @@
+from django.contrib import messages
+from django.test import RequestFactory, TestCase
+
+
+class DummyStorage(object):
+    """
+    dummy message-store to test the api methods
+    """
+
+    def __init__(self):
+        self.store = []
+
+    def add(self, level, message, extra_tags=''):
+        self.store.append(message)
+
+
+class ApiTest(TestCase):
+    def setUp(self):
+        self.rf = RequestFactory()
+        self.request = self.rf.request()
+        self.storage = DummyStorage()
+
+    def test_ok(self):
+        msg = 'some message'
+
+        self.request._messages = self.storage
+        messages.add_message(self.request, messages.DEBUG, msg)
+        self.assertIn(msg, self.storage.store)
+
+    def test_request_is_none(self):
+        msg = 'some message'
+
+        self.request._messages = self.storage
+
+        with self.assertRaises(TypeError):
+            messages.add_message(None, messages.DEBUG, msg)
+
+        self.assertEqual([], self.storage.store)
+
+    def test_middleware_missing(self):
+        msg = 'some message'
+
+        with self.assertRaises(messages.MessageFailure):
+            messages.add_message(self.request, messages.DEBUG, msg)
+
+        self.assertEqual([], self.storage.store)
+
+    def test_middleware_missing_silently(self):
+        msg = 'some message'
+
+        messages.add_message(self.request, messages.DEBUG, msg,
+                             fail_silently=True)
+
+        self.assertEqual([], self.storage.store)