The original Ruby 1.9 compatibility Mocha changeset (revision 206) was getting confused by the change in Rails changeset 8403 [1] which tries to make Ruby 1.8.x look more like Ruby 1.9. I've just checked in what I think is a more robust solution in Mocha changeset 208. -- James. http://blog.floehopper.org http://tumble.floehopper.org