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Why is it important that contract tests are run both by the API consumer and provider?

hard📝 Conceptual Q10 of 15
Rest API - API Testing and Monitoring
Why is it important that contract tests are run both by the API consumer and provider?
ATo improve API performance under load
BTo verify both sides adhere to the agreed contract and catch mismatches early
CTo test the API's user interface consistency
DTo check the API's database schema
Step-by-Step Solution
Solution:
  1. Step 1: Understand dual testing roles

    Consumers verify their requests match the contract; providers verify their responses do.
  2. Step 2: Importance of running tests on both sides

    This ensures both sides follow the contract and mismatches are found early before deployment.
  3. Final Answer:

    To verify both sides adhere to the agreed contract and catch mismatches early -> Option B
  4. Quick Check:

    Run contract tests on both sides = Catch mismatches early [OK]
Quick Trick: Both consumer and provider must run contract tests [OK]
Common Mistakes:
MISTAKES
  • Thinking only provider needs to run contract tests
  • Confusing contract testing with performance or UI testing
  • Ignoring importance of early mismatch detection

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