java-regression-test-generator

JUnit 5 regression tests capture the current behavior of Java methods by recording observed outputs for specified inputs. This creates stable assertions that act as a safety net, flagging unintended behavior changes immediately during refactoring.

Regression testing handles non-determinism by pinning the system clock and injecting seeded random number generators. This stabilizes Java method outputs, ensuring JUnit 5 assertions remain reproducible and consistent across multiple test runs.

Yes, JUnit 5 parameterized tests capture Java method behavior across multiple input sets. The generator records observed outputs for each parameter combination, creating assertions that document current behavior across various inputs before refactoring.

Lock in known-buggy behavior by flagging it within generated JUnit 5 regression tests. The Skill documents these specific flawed outputs, tracking existing issues precisely so they are intentionally preserved during refactoring until a dedicated fix is applied.

Generating JUnit 5 regression tests is the best way to preserve legacy Java behavior without specifications. By capturing actual method outputs for given inputs, the generator creates a behavioral specification from observed execution, providing a safety net for confident modifications.