tests/test-check-interfaces.py

--- a/tests/test-check-interfaces.py	Mon Sep 24 08:58:57 2018 -0700
+++ b/tests/test-check-interfaces.py	Wed Sep 19 11:17:28 2018 -0700
@@ -229,4 +229,8 @@
         basenode=b'')
     checkzobject(rdr)
 
+    ziverify.verifyClass(repository.iverifyproblem,
+                         revlog.revlogproblem)
+    checkzobject(revlog.revlogproblem())
+
 main()