Any change to organization metadata has the potential to cause unit tests to fail - which can make it impossible to deploy change-sets. The Apex Test Tracker helps admins proactively detect configuration changes that break unit tests.
This free software is provided as-is with no warranty support or guarantee of performance. Find detailed information at http://advancedapex.com/testtracker. Source code is available at https://github.com/DesawarePublishing/Apex-Test-Tracker.