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API Testing

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Bikash Sharma
Bikash Sharma

API testing verifies the functionality, usability, security, and performance of application programming interfaces (APIs). Key aspects to test include input parameters, error handling, response times, authentication, and documentation. Automated testing scripts should be created to regularly test APIs for bugs such as unhandled errors, security vulnerabilities, incorrect responses, and reliability issues. Thorough API testing requires considering parameter combinations, output validation across systems, and exception handling.

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API Testing
What is API testing? 2
API testing… Test Cases for API Testing: ● Return value based on input condition ● Does not return anything ● Trigger some other API/event/interrupt ● Update data structure ● Modify certain resources 3
What to test for in API testing ● Discovery testing: The test group should manually execute the set of calls documented in the API like verifying that a specific resource exposed by the API can be listed, created and deleted as appropriate ● Usability testing: This testing verifies whether the API is functional and user-friendly. And does API integrates well with another platform as well ● Security testing: This testing includes what type of authentication is required and whether sensitive data is encrypted over HTTP or both ● Automated testing: API testing should culminate in the creation of a set of scripts or a tool that can be used to execute the API regularly ● Documentation: The test team has to make sure that the documentation is adequate and provides enough information to interact with the API. Documentation should be a part of the final deliverable 4
Types of Bugs that API testing detects ● Fails to handle error conditions gracefully ● Unused flags ● Missing or duplicate functionality ● Reliability Issues. Difficulty in connecting and getting response from API. ● Security Issues ● Performance Issues. API response time is very high. ● Improper errors/warning to caller ● Incorrect handling of valid argument values ● Response Data is not structured correctly (JSON) 5
Tools for API testing ● SOAPUI ● Runscope ● Postman with jetpacks ● Postman with newman ● Curl ● Cfix ● Check ● CTESK ● dotTEST ● Eclipse SDK tool- Automated API testing 6
Challenges of API Testing Challenges of API testing includes: ● Main challenges in API testing is Parameter Combination, Parameter Selection, and Call Sequencing ● There is no GUI available to test the application which makes difficult to give input values ● Validating and Verifying the output in different system is little difficult for testers ● Parameters selection and categorization required to be known to the testers ● Exception handling function needs to be tested ● Coding knowledge is necessary for testers 7
Conclusion API consists of set of classes / functions / procedures which represent the business logic layer. If API is not tested properly, it may cause problems not only the API application but also in the calling application. 8
Thank You Bikash Kumar Sharma SoftwareArchitect bikashsharma.bks@gmail.com @bikashsharmabks bikashkumarsharma 9

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API Testing

  • 2. What is API testing? 2
  • 3. API testing… Test Cases for API Testing: ● Return value based on input condition ● Does not return anything ● Trigger some other API/event/interrupt ● Update data structure ● Modify certain resources 3
  • 4. What to test for in API testing ● Discovery testing: The test group should manually execute the set of calls documented in the API like verifying that a specific resource exposed by the API can be listed, created and deleted as appropriate ● Usability testing: This testing verifies whether the API is functional and user-friendly. And does API integrates well with another platform as well ● Security testing: This testing includes what type of authentication is required and whether sensitive data is encrypted over HTTP or both ● Automated testing: API testing should culminate in the creation of a set of scripts or a tool that can be used to execute the API regularly ● Documentation: The test team has to make sure that the documentation is adequate and provides enough information to interact with the API. Documentation should be a part of the final deliverable 4
  • 5. Types of Bugs that API testing detects ● Fails to handle error conditions gracefully ● Unused flags ● Missing or duplicate functionality ● Reliability Issues. Difficulty in connecting and getting response from API. ● Security Issues ● Performance Issues. API response time is very high. ● Improper errors/warning to caller ● Incorrect handling of valid argument values ● Response Data is not structured correctly (JSON) 5
  • 6. Tools for API testing ● SOAPUI ● Runscope ● Postman with jetpacks ● Postman with newman ● Curl ● Cfix ● Check ● CTESK ● dotTEST ● Eclipse SDK tool- Automated API testing 6
  • 7. Challenges of API Testing Challenges of API testing includes: ● Main challenges in API testing is Parameter Combination, Parameter Selection, and Call Sequencing ● There is no GUI available to test the application which makes difficult to give input values ● Validating and Verifying the output in different system is little difficult for testers ● Parameters selection and categorization required to be known to the testers ● Exception handling function needs to be tested ● Coding knowledge is necessary for testers 7
  • 8. Conclusion API consists of set of classes / functions / procedures which represent the business logic layer. If API is not tested properly, it may cause problems not only the API application but also in the calling application. 8
  • 9. Thank You Bikash Kumar Sharma SoftwareArchitect bikashsharma.bks@gmail.com @bikashsharmabks bikashkumarsharma 9