Code Review: Tests with Mocks and Stubs

Make sure your code interacts with other components via abstractions. They make code easier to understand and easier to test.

Prefer function-field stubs over switch-statement stubs when the same method needs different behavior across test cases.

Stubs are useful for testing, but verify that usign one is helping you test your production code, not the stub itself.

Use httptest to validate that the HTTP clients in your code are both sending and receiving data correctly.

Separate unit tests from integration test via tags or environment variables.