Common Mistakes to Avoid While Testing OTP APIs
QA engineers should watch out for these common mistakes:
- Testing only the successful verification scenario.
- Ignoring expired and previously used OTPs.
- Checking the HTTP status code without validating the response body.
- Forgetting to test resend limits.
- Assuming that every API must return the same status code for invalid OTPs.
- Using real customer phone numbers without permission.
- Assuming that a successful API response proves SMS or email delivery.
- Ignoring concurrent requests and repeated verification attempts.
- Checking only the UI instead of validating server-side behavior.
A good OTP API test suite should cover expected behavior, failure scenarios, boundary conditions, and security requirements.