// Identifies and fixes bugs systematically. Invoke when user reports an error, test failure, or unexpected behavior that needs debugging and fixing.
Guide how to write test cases in this project by first analyzing the target class to decide which test pattern, base class, and test utilities to use. Activate when user asks to write tests, add test coverage, or create test cases for any class.
Reviews a git commit to create a test plan document. Invoke when user asks to review a commit, analyze changes, or create test coverage plan for recent changes.
| name | bug-fixer |
| description | Identifies and fixes bugs systematically. Invoke when user reports an error, test failure, or unexpected behavior that needs debugging and fixing. |
This skill provides a systematic approach to identify and fix bugs.
Before fixing, verify:
CRITICAL: Always write or update test cases BEFORE fixing the bug.
User reports: "NullPointerException in UserService.getUser()"
1. Read UserService.getUser() and trace the null path
2. Check if null input is valid or should be rejected
3. Write test: testGetUserWithNullInputThrowsException()
4. Run test - confirm it fails
5. Add null check and throw IllegalArgumentException
6. Run test - confirm it passes
7. Run all UserService tests - confirm no regression