You are tasked with improving the reliability of a large codebase. Using Jest, how would you approach writing tests for functions with side effects like database calls or API requests?

  • Use Jest's mocking capabilities to create mocks or spies for database and API calls.
  • Skip testing functions with side effects; focus on pure functions.
  • Manually perform database/API calls in tests to ensure real-world reliability.
  • Use only integration tests for functions with side effects.
To improve reliability and isolate side effects, you should use Jest's mocking capabilities to create mocks or spies for database and API calls. This way, you can control and verify the behavior of these calls without involving the actual database or API. The other options may lead to unreliable tests or skipped testing.
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