Maybe there are some trainers here that won't mind sharing their information, but until somebody offers... Have you identified what the minimum qualifications are to do the job? I would use that and create a test with a few questions to challenge each aspect.
Our trainer has been out over 2 months now due to an illness so I don't have documents. I do know that in the training program, we use the job guidelines as well as basic skills and then test operator ability to answer process questions correctly to gauge where they are in the certification process. We use a combination of classroom and OJT with both written tests and Supervisor OJ observations as a pass/fail to the training.