Mutation Testing
summary
Java + JUnit + JaCoCo example implements a simple palindrome function, reaches 100% JaCoCo coverage only after adding a partial-palindrome test, then runs mutation testing with Pit via Maven which modifies bytecode in memory and re-runs only the affected tests. Pit generates 9 mutants, initially 9 mutations, 8 killed -> 9/9 killed after adding a two-character test to cover the boundary (less than two), and the project + report live on GitHub.
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chapters (7)
- 0:00Introduction to mutation testing
- 3:23How mutation testing works
- 10:26Demo with palindrome function
- 25:50Evaluating test quality
- 29:46Running Pitest on code
- 37:03Best practices and limitations
- 41:58Q&A
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