FIX: add missing in

unittests/test_identifiable.py

@@ -67,7 +67,7 @@ def test_name():
 
 def test_repr():
     # only test that something meaningful is returned
-    assert 'properties'  str(Identifiable(name="A", record_type="B"))
+    assert 'properties' in str(Identifiable(name="A", record_type="B"))
 
 
 def test_equality():