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You want to test a Spring Boot service method that calls an external API. What is the best approach?

hard📝 Application Q8 of 15
Spring Boot - Testing Spring Boot Applications
You want to test a Spring Boot service method that calls an external API. What is the best approach?
AWrite tests only for the controller layer
BCall the real external API every test run
CRemove the service method from tests
DMock the external API call to isolate the service logic
Step-by-Step Solution
Solution:

  1. Step 1: Understand testing external dependencies

    Calling real APIs in tests is slow and unreliable.

  2. Step 2: Use mocking to isolate logic

    Mocking the API lets tests focus on service behavior without external failures.

  3. Final Answer:

    Mock the external API call to isolate the service logic -> Option D

  4. Quick Check:

    Mock external calls for reliable service tests [OK]
Quick Trick: Mock external APIs to keep tests fast and stable [OK]
Common Mistakes:
  • Calling real APIs slows tests
  • Skipping service tests loses coverage
  • Testing only controllers misses logic

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