QA interviews often ask candidates to test something ordinary, like a pen or a login page. The interviewer is not checking tool knowledge. They are watching how you break a thing into parts, which cases you think of first, and whether you consider misuse as well as normal use. Practising on everyday objects builds exactly this habit.
Answering a test-design question well
- Start by clarifying the purpose: who uses it, and what counts as working.
- Cover normal use first, then boundaries, such as empty inputs, maximum lengths, and repeated actions.
- Add misuse cases: what happens when someone does the wrong thing, deliberately or by accident.
- Prioritise out loud, saying which cases matter most and why, since time is always limited.
Talk while you think. Interviewers cannot credit reasoning they cannot hear, however good it is.