I recently came across a rather unsual error with our testing suite while running on Jenkins. The test would pass on our development environment, not exactly odd in itself. Sadly they aren’t exact copies, patch level out and what not. However the test would pass on the Jenkins server if ran via command line. So it wasn’t that a minor release had a bug fix that was causing the issue. Since after all my googling on the subject turned up nothing I thought I would write up how I found out what it was and what the cause and solution was.