Answer
Effective testing ensures correctness, stability, and performance:
- Unit test controllers using mocked services (Moq, NSubstitute).
- Use WebApplicationFactory or TestServer for integration tests.
- Use Postman/Newman or CI pipelines for end-to-end validation.
- Validate headers, status codes, responses, and edge cases.
- Load test APIs using JMeter, k6, or Locust to verify scalability.