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API Test Plan Interview Questions and Answers (Level-2)

By Manisha

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7. How do you test data validation using the Fake REST API?

Answer: By checking:

  • Field types (e.g., strings for names, integers for IDs)
  • Required fields
  • Length constraints
  • Boundary value conditions

8. What kind of security tests can you perform on a REST API?

Answer:

  • Validate authentication (e.g., token-based access)
  • Test HTTPS enforcement
  • Perform penetration testing for SQL injection, XSS, CSRF, etc.

9. How do you test for rate limiting in APIs?

Answer: Send rapid, repeated requests to the API and validate if it returns 429 Too Many Requests or any configured rate-limiting response.

10. What is regression testing in API Testing?

Answer: Regression testing ensures new updates or code changes don’t affect the existing functionality. Previous test cases are re-executed after every release.

11. What strategies do you use to create test data?

Answer:

  • Manual entry
  • Automation scripts (e.g., in Python or Java)
  • Using Mock APIs
  • Using real-time sanitized production data

12. What are the common HTTP status codes used in API testing?

Answer:

  • 200 OK
  • 201 Created
  • 400 Bad Request
  • 401 Unauthorized
  • 403 Forbidden
  • 404 Not Found
  • 500 Internal Server Error

👉The Next Questions-3: API TEST PLAN

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