Go Testing — Advanced Patterns

This skill extends go-testing with mocking, benchmarks, fuzzing, HTTP testing, and CI/CD.

When to Activate

• Writing interface-based mocks without external libraries
• Benchmarking performance-critical code
• Using Go 1.18+ fuzzing for input validation
• Testing HTTP handlers with net/http/httptest
• Setting up CI/CD test pipelines
• Comparing benchmark results across commits using benchstat to detect performance regressions
• Adding a fuzz corpus and property-based assertions to a parser or input validation function
• Configuring a GitHub Actions workflow that enforces Go test coverage thresholds on every pull request

Interface-Based Mocking

The idiomatic Go approach: define a minimal interface, write a fake that implements it, inject at the call site.