Mocking & Stubbing APIs

Summary

Simulating an API's responses without calling the real backend — useful for testing in isolation, testing error scenarios that are hard to trigger for real, and testing before a dependent service is even built.

• 1Set up a basic API mock returning a predefined response for a sample test.
• 2Learn why mocking is especially useful for testing error scenarios (like a 500 response) reliably.
• 3Understand the trade-off: mocks test your handling logic, not the real integration.