Write tests that are direct, focused, and free of unnecessary complexity. Remove redundant test fields, use direct assertions with expected values, and leverage existing fixtures instead of creating temporary content. **Key principles:** - Remove unnecessary test case fields that aren't actually used in assertions - Use direct comparisons (`require.Equal`) with expected output instead of calculating or checking properties within tests - Leverage existing fixture files and glob patterns rather than creating temporary files and content - Keep tests focused on a single responsibility - split tests that cover multiple features - Use appropriate abstraction levels (prefer higher-level integration tests over low-level unit tests that re-implement logic) **Example of simplification:** ```go // Before: Complex test with unused fields type test struct { errType errorType err error // unused resCode int msg string // unused errTypeToStatusCode ErrorTypeToStatusCode } // After: Simplified test structure type test struct { errType errorType resCode int errTypeToStatusCode ErrorTypeToStatusCode } // Use direct values instead of variables api.respondError(w, &apiError{tc.errType, errors.New("message")}, "test") ``` This approach makes tests more maintainable, easier to understand, and less prone to errors from unused or redundant code.