Which principle of testing did Mr. Test neglect by not modifying automated test cases?

The principle of testing that Mr. Test neglected by not modifying automated test cases is that repeating tests will not find new defects. This principle emphasizes that running the same tests, especially if they are unchanged and targeting the same scenarios, is unlikely to uncover new defects in the software. Instead, it is crucial to adapt and modify test cases to address new code changes, different configurations, or newly identified risks.

By failing to update the automated test cases, Mr. Test limited the effectiveness of his testing efforts. Test cases should evolve to explore different paths and scenarios as the application undergoes changes. This principle serves as a reminder that simply re-running existing tests does not contribute significantly to identifying new issues; a proactive approach that includes updating and creating new tests based on changes in the application or insights gained from previous testing is essential for quality assurance.