Understanding the Purpose of Test Cases and How to Answer Interview Questions

Interviewers from different companies often ask QA candidates about the role of test cases, the necessity of test case reviews, methods for writing them, and the tools used. The article collects typical answers and shows why each is only a partial view.

To answer interview questions convincingly, candidates should explain that test cases serve multiple goals: they are the basis for test execution, they prevent missed scenarios, they break down requirements into verifiable steps, and they ensure shared understanding among stakeholders.

The article then proposes a three‑part framework for writing test cases:

1. What to test? Test cases should decompose requirements into functional, robustness, performance, and edge‑case checks, covering input ranges, error handling, and system‑specific characteristics.

2. How to test? Detailed test steps, preconditions, and priorities help both the author and other testers execute the cases reliably, reducing miscommunication and supporting agile environments where requirements evolve.

3. Who reads the test cases? Besides testers, product owners, developers, and project leads review test cases to verify coverage, confirm requirements, and align design and implementation.

Effective test cases also support smoke testing, developer self‑testing, and acceptance testing, and they should be archived for future reuse. The article concludes with practical advice for interview preparation and emphasizes that understanding the broader purpose of test cases demonstrates deeper QA competence.