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Your Go tests probably don't need a mocking library

https://rednafi.com/go/mocking-libraries-bleh/ · 23 Jan 2026

Practical patterns for mocking in Go without external libraries. Learn to mock functions, methods, interfaces, HTTP calls, and time using only the standard library

go testing api

Formatting Tests

https://dev.leaflet.pub/3mc6nmvhih22f · 11 Jan 2026

Ignore this article it is for testing

testing formatting hidden

Tap compare testing for service migration

https://rednafi.com/system/tap-compare-testing/ · 13 Dec 2025

Master shadow testing for large-scale system migrations. Learn to safely rewrite services by comparing outputs between old and new implementations.

distributed systems go testing

Re-exec testing Go subprocesses

https://rednafi.com/go/test-subprocesses/ · 16 Nov 2025

Test Go subprocesses with the re-exec pattern: spawn your test binary as a subprocess to emulate real command behavior reliably.

go testing

Revisiting interface segregation in Go

https://rednafi.com/go/interface-segregation/ · 1 Nov 2025

Apply SOLID's Interface Segregation Principle in Go with consumer-defined contracts. Learn why small interfaces and implicit implementation matter.

go api testing

Organizing Go tests

https://rednafi.com/go/organizing-tests/ · 8 Oct 2025

Organize Go tests with in-package, external _test packages, and integration tests. Learn white-box vs black-box testing conventions.

go testing

Subtest grouping in Go

https://rednafi.com/go/subtest-grouping/ · 1 Oct 2025

Organize Go subtests with t.Run nesting and parallel execution. Learn patterns for setup, teardown, and readable test hierarchies.

go testing

Test state, not interactions

https://rednafi.com/go/test-state-not-interactions/ · 14 Sep 2025

Avoid brittle AI-generated tests that check implementation details. Write maintainable tests that verify behavior, not method calls.

go testing

Early return and goroutine leak

https://rednafi.com/go/early-return-and-goroutine-leak/ · 7 Sep 2025

Prevent goroutine leaks caused by early returns with unbuffered channels. Learn buffering, draining, errgroup patterns, and goleak testing.

go concurrency testing

Lifecycle management in Go tests

https://rednafi.com/go/lifecycle-management-in-tests/ · 30 Aug 2025

Master Go test lifecycle with t.Cleanup(), subtests, and TestMain. Learn per-test, grouped, and package-wide setup patterns effectively.

go testing api