API Testing CT-QDO Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Which of the following is a key characteristic that distinguishes API testing from UI testing?

   • AAPI testing focuses on business logic, data formats, and integration points, while UI testing focuses on user interactions and visual presentation
   • BAPI testing is only concerned with the performance of the application, not its functionality
   • CUI testing is faster and more reliable than API testing because it exercises the full system
   • DAPI testing requires a fully functional user interface to execute test cases
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2. 17foundation · easy

   What is a best practice for managing test data in API testing?

   • AShare a single set of test data across all test suites to reduce maintenance
   • BHard-code all test data values in the test scripts to avoid external dependencies
   • CUse isolated, controlled test data that is created and cleaned up within the test execution
   • DUse production data directly to ensure tests reflect real-world scenarios
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4. 18expert · hard

   A team is managing an API that has multiple versions (v1 and v2) in production. They want to add automated tests to the CI pipeline without breaking existing consumers. They have limited test execution time. What is the best strategy?

   • ARun only performance tests for both versions to ensure stability.
   • BRun contract tests for both versions in parallel in the CI pipeline.
   • CRun all tests sequentially, including full regression for both versions.
   • DRun only v2 tests because v1 is legacy and will be deprecated soon.
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5. 19expert · hard

   A team is building an API that aggregates data from multiple internal services. They need to ensure that the API works correctly when one of the downstream services is slow or unavailable. Which testing approach is most important?

   • APerformance testing under normal load only
   • BIntegration testing with simulated downstream service failures
   • CContract testing to ensure the API's response format is correct
   • DFunctional testing of the API's business logic in isolation
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6. 20foundation · easy

   What role does API testing play in the continuous delivery pipeline?

   • AIt acts as a gate that verifies service behavior before the build is promoted to later stages, such as staging or production
   • BIt is responsible for deploying the application to the production environment
   • CIt is used only to generate documentation for the API
   • DIt replaces the need for configuration management and infrastructure provisioning
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