When responding to a question about unit testing, your answer should include an outline of a plan you use. Elements of the plan should include the frequency, the tests you run, and actions you take if errors are found. If you have a definitive plan you used in your previous employment, you may want to have this available to share with the interviewer, as long as it is not proprietary to the organization you worked for. As with any operational question, keep your answer brief and to the point, and be prepared for a follow-up question.

"I believe unit testing is extremely important when developing software because it helps to identify coding and logic errors at each stage of the development process. This prevents defects from being included in the final product. Additionally, frequent testing helps to prevent regressions, where bugs that were already fixed reappear. Unit testing is considered a best practice in software development and code maintenance and is part of my overall testing strategy."