Go Testing Techniques: Benchmarking, Table‑Driven Tests, Parallel Execution, Coverage, Race Detection, and Vet

Go provides a rich testing framework that includes benchmark tests, table‑driven tests, parallel execution, coverage reporting, race detection, and static analysis.

Benchmark functions must start with Benchmark and accept a *testing.B parameter; they are run with go test -bench , and the framework controls the iteration count b.N . The b.ResetTimer() call can exclude setup time, and b.RunParallel enables parallel benchmarking.

Table‑driven tests define a slice of test cases and iterate over them, allowing a single test function to cover many inputs and expected outputs, improving readability and maintainability. Sub‑tests can be created with t.Run , each receiving a unique name.

Parallel tests use t.Parallel() to run sub‑tests concurrently, and the -run and -bench flags accept regular expressions to select specific tests or benchmarks.

Coverage information is obtained with go test -cover or -coverprofile , and visualized via go tool cover -html=cover.out .

The race detector, enabled with the -race flag, reports data races at runtime; an example demonstrates a write‑read race detected by the tool.

Finally, go vet performs static analysis to catch common mistakes in Go code.