diff --git a/hem/tests/test_interfaces.py b/hem/tests/test_interfaces.py
new file mode 100644
index 0000000..e6e0c3f
--- /dev/null
+++ b/hem/tests/test_interfaces.py
@@ -0,0 +1,11 @@
+import unittest
+
+class TestInterfaces(unittest.TestCase):
+    def test_dbsession(self):
+        """ Shouldn't be able to instantiate the interface """
+        from hem.interfaces import IDBSession
+
+        def make_session():
+            IDBSession('1')
+
+        self.assertRaises(TypeError, make_session)