11. What are the common API Testing Types?
Answer:
Types of API Testing include:
- Validation Testing: Checking if APIs meet requirements.
- Functional Testing: Testing specific functions.
- Load Testing: Checking performance under load.
- Error Detection Testing: Identifying failures or crashes.
- Security Testing: Checking data security.
- Penetration Testing: Finding vulnerabilities.
- Fuzz Testing: Sending random data to check system behavior.
- Interoperability Testing: Ensuring different systems work together.
12. What is the Procedure to Perform API Testing?
Answer:
General procedure:
- Select the API test suite.
- Choose test development mode (manual/automated).
- Create test cases for the API methods.
- Set up input parameters.
- Perform method validations.
- Execute the tests.
- Analyze the results.
- Organize and maintain the API test cases.
13. What must be checked when performing API Testing?
Answer:
During API Testing, verify:
- Data accuracy (expected output)
- Schema validation (correct data structure)
- HTTP status codes (200 OK, 404 Not Found, etc.)
- Data types and completeness
- Authorization and security (valid access)
- Timeout handling (response in limited time)
- Error handling (appropriate error codes like 400 Bad Request)
14. What is the best approach method to perform API Testing?
Answer:
Best practices include:
- Correctly defining input parameters.
- Verifying combinations of parameters.
- Creating detailed functional tests.
- Using techniques like boundary value analysis.
- Performing negative testing (invalid inputs).
- Stress testing under high load.
- Analyzing results and performance.
- Ensuring database and backend validations.
15. What are tools that could be used for API Testing?
Answer:
Popular API Testing Tools include:
- Postman: Widely used for manual testing.
- SoapUI: Good for SOAP and REST APIs.
- Katalon Studio: For automated API testing.
- Tricentis Tosca: Supports complex scenarios.
- Apigee: Google’s powerful API testing platform.
Each tool has specific strengths based on testing requirements.
16. What are differences between API Testing and Unit Testing?
Answer:
- Unit Testing focuses on testing individual methods or components inside the application.
- API Testing tests entire system behavior by interacting with APIs (external or internal).
- Unit tests are usually written by developers; API tests may be done by QA teams.
17. What are differences between API Testing and UI Testing?
Answer:
- API Testing focuses on the backend and data processing without a GUI.
- UI Testing focuses on the frontend user interface, checking the visuals and interactions.
- API testing is faster and less brittle, whereas UI testing is essential for user experience validation.
18. What are major challenges faced in API Testing?
Answer:
- Selecting proper input parameters.
- Dealing with various parameter combinations.
- Managing sequences of API calls.
- Verifying complex output responses.
- Lack of GUI, making manual input verification tough.
- Handling security (auth, tokens).
Overcoming these challenges requires a good understanding of API behavior and system architecture.
19. What are the Testing Methods that come under API Testing?
Answer:
Testing methods include:
- Unit Testing
- Functional Testing
- Load Testing
- Security and Penetration Testing
- Discovery Testing
- Reliability Testing
- Automation Testing
- Integration Testing
- API Documentation Testing
Each method targets different quality aspects of an API.
20. Why is API Testing considered as the most suitable form for Automation Testing?
Answer:
API Testing is best for automation because:
- It verifies the system’s core functionality effectively.
- APIs remain stable compared to rapidly changing GUIs.
- API tests are faster to run and maintain.
- Feedback is quick, allowing faster issue detection.
- They easily integrate into CI/CD pipelines for continuous testing.
Automation makes API testing scalable, reliable, and critical for modern agile software development.
