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Testing Interview Questions & Answers

Testing Technical Interview Questions

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How would you test an input that accepts integer ages from 18 through 60 inclusive?

Use equivalence classes and boundary values. Test representative valid input and the edges 18 and 60, plus invalid neighbors 17 and 61. Also test missing input, whitespace, nonnumeric text, fractional...

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What should an API test cover beyond the HTTP status code?

Check response schema, field types, required values, authorization, relevant headers, and persistent side effects. For an order API, confirm the correct account owns the order, totals match server rul...

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When do mocks make tests weaker rather than stronger?

Mocks weaken confidence when they reproduce implementation details, assume undocumented dependency behavior, or allow interactions that the real dependency would reject. A test can pass while serializ...

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A test fails intermittently in CI but passes locally. How would you investigate it?

Preserve failure logs, random seeds, timing, environment, and artifacts before rerunning. Look for shared state, test-order dependence, real-time assumptions, network calls, resource contention, and u...

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