Run Go tests with coverage and the race detector (go test, go tool cover)
domain: go.dev · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Run every package's tests: `go test ./...`. Add `-v` for per-test output.
Filter by regexp on test names: `go test -run 'TestParse.*' ./...` (RE2 syntax, matched against the test name).
Detect data races: `go test -race ./...` — instrumented run, slower and more memory-hungry.
Coverage: `go test -coverprofile=cover.out ./...`, then `go tool cover -func=cover.out` for a per-function summary or `go tool cover -html=cover.out` for an annotated browser view.
Docs: https://go.dev/ref/mod and `go help testflag`; race detector details: https://go.dev/doc/articles/race_detector
Known gotchas
-race is supported only on linux/amd64, freebsd/amd64, darwin/amd64, darwin/arm64, windows/amd64, linux/ppc64le and linux/arm64 (48-bit VMA) — per current `go help build`. Cross-building with -race for other targets fails.
-run matches an unanchored regexp: `-run TestFoo` also runs TestFooBar; anchor with `-run '^TestFoo$'`.
Plain `go test ./...` prints no coverage; you must pass -cover or -coverprofile explicitly.
Test binaries cache successful results; a '(cached)' result means nothing re-ran — use `-count=1` to force execution.
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