--- a/dev-requirements.txt	Fri Jun 17 21:23:45 2016 +0800
+++ b/dev-requirements.txt	Sat Jun 18 18:56:12 2016 +0800
@@ -1,1 +1,2 @@
+mock==2.0.0
 pytest==2.9.2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_viewer.py	Sat Jun 18 18:56:12 2016 +0800
@@ -0,0 +1,16 @@
+from mock import Mock
+from tornado.testing import AsyncHTTPTestCase
+
+from candolint.models import database, Project, Change, Check
+from viewer import CandolintViewer
+
+
+class ViewerTestCase(AsyncHTTPTestCase):
+    def get_app(self):
+        database.init(':memory:')
+        database.connect()
+        database.create_tables([Project, Change, Check], safe=True)
+        database.init = Mock()
+        database.connect = Mock()
+        database.disconnect = Mock()
+        return CandolintViewer()