Top 3 Regression testing Interview Questions
Browse 3 real-world technical and behavioral interview questions about Regression testing. Review scenarios, edge cases, and architectural best practices.
The interviewer hands you working production code with a few deliberate changes that break it. You have 45 minutes. What do you do before you read line one?
In a debugging exercise with planted breaks, get a feedback loop before you read closely. Ask what correct behaviour is, whether you can run it and its tests, and what counts as done, then let failing behaviour point you to the code. Small planted changes hide from reading and show up when the code runs.
You are shipping an LLM feature and there is no evaluation set. How do you build one?
Harvest cases from real inputs and past incidents rather than inventing them, record for every case why it exists and what failure it guards, separate deterministic assertions from graded quality, and freeze a regression slice you never tune against.
You have fine-tuned a model for a task. How do you prove it helped?
Compare it against a genuinely strong prompted baseline on a held-out set drawn from real traffic, using the task metric your product cares about, and run a broad regression set alongside to catch capability lost elsewhere. Falling training loss is evidence that training worked, not that the product improved.