diff --git a/plinth/tests/test_middleware.py b/plinth/tests/test_middleware.py
new file mode 100644
index 000000000..eef329a57
--- /dev/null
+++ b/plinth/tests/test_middleware.py
@@ -0,0 +1,121 @@
+#
+# This file is part of Plinth.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+Test module for Plinth's custom middleware.
+"""
+
+from unittest.mock import Mock, patch
+
+from django.http import HttpResponse
+from django.test import TestCase
+from django.test.client import RequestFactory
+
+from plinth import cfg
+from plinth.middleware import SetupMiddleware
+
+
+class TestSetupMiddleware(TestCase):
+    """Test cases for setup middleware."""
+    @classmethod
+    def setUpClass(cls):
+        """Setup all the test cases."""
+        super(TestSetupMiddleware, cls).setUpClass()
+
+        cfg.read()
+
+    def setUp(self):
+        """Setup each test case before execution."""
+        super(TestSetupMiddleware, self).setUp()
+
+        self.middleware = SetupMiddleware()
+
+        self.kwargs = {
+            'view_func': HttpResponse,
+            'view_args': [],
+            'view_kwargs': {},
+        }
+
+    def test_404_urls(self):
+        """Test how middleware deals with 404 URLs."""
+        request = RequestFactory().get('/plinth/non-existing-url')
+
+        response = self.middleware.process_view(request, **self.kwargs)
+
+        self.assertEqual(response, None)
+
+    def test_url_not_an_application(self):
+        """Test that none is returned for URLs that are not applications."""
+        request = RequestFactory().get('/plinth/')
+
+        response = self.middleware.process_view(request, **self.kwargs)
+
+        self.assertEqual(response, None)
+
+    @patch('plinth.module_loader.loaded_modules')
+    @patch('django.core.urlresolvers.resolve')
+    def test_module_is_up_to_date(self, resolve, loaded_modules):
+        """Test that none is returned when module is up-to-date."""
+        resolve.return_value.namespaces = ['mockapp']
+        module = Mock()
+        module.setup_helper.is_finished = None
+        module.setup_helper.get_state.return_value = 'up-to-date'
+        loaded_modules.__getitem__.return_value = module
+
+        request = RequestFactory().get('/plinth/mockapp')
+
+        response = self.middleware.process_view(request, **self.kwargs)
+
+        self.assertEqual(response, None)
+
+    @patch('plinth.views.SetupView')
+    @patch('plinth.module_loader.loaded_modules')
+    @patch('django.core.urlresolvers.resolve')
+    def test_module_view(self, resolve, loaded_modules, setup_view):
+        """Test that setup view is returned."""
+        resolve.return_value.namespaces = ['mockapp']
+        module = Mock()
+        module.setup_helper.is_finished = None
+        loaded_modules.__getitem__.return_value = module
+        view = Mock()
+        setup_view.as_view.return_value = view
+
+        request = RequestFactory().get('/plinth/mockapp')
+        self.middleware.process_view(request, **self.kwargs)
+
+        setup_view.as_view.assert_called_once_with()
+        view.assert_called_once_with(request, setup_helper=module.setup_helper)
+
+    @patch('django.contrib.messages.success')
+    @patch('plinth.module_loader.loaded_modules')
+    @patch('django.core.urlresolvers.resolve')
+    def test_install_result_collection(self, resolve, loaded_modules,
+                                       messages_success):
+        """Test that module installation result is collected properly."""
+        resolve.return_value.namespaces = ['mockapp']
+        module = Mock()
+        module.setup_helper.is_finished = True
+        module.setup_helper.collect_result.return_value = None
+        module.setup_helper.get_state.return_value = 'up-to-date'
+        loaded_modules.__getitem__.return_value = module
+
+        request = RequestFactory().get('/plinth/mockapp')
+        response = self.middleware.process_view(request, **self.kwargs)
+
+        self.assertIsNone(response)
+        assert messages_success.called
+        module.setup_helper.collect_result.assert_called_once_with()