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Go's standard library and language features provide sufficient tools for mocking in tests without external libraries. The article demonstrates practical patterns including function injection, interface segregation, struct embedding, and using httptest for HTTP mocking. Key techniques include making dependencies injectable through function parameters, defining minimal consumer-side interfaces, using function types as single-method interface adapters, and leveraging Go 1.25's synctest for time-based testing. While mocking libraries have their place (like gRPC testing), handwritten fakes often provide better control, clearer test intent, and reduced onboarding complexity.

Your Go tests probably don't need a mocking library

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