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Here is the walk though on how to find the method that fails via code coverage.
Walk through
http://qa1-nl.sakaiproject.org:82
Open the qa-helper in one browser window
Open the offending tool qa-fails in another browser window
Play the game until you have a reproducible case
Reset the EMMA session data in the helper tool
Reproduce the error in the failure tool
Generate a report in the helper tool
Review the reoprt and look for the partially run code in yellow
