runner

func Run ¶

func Run(ctx context.Context, opts Options) (int, error)

Run executes every group, running invocations concurrently.

Narrowed groups almost never share a -run pattern, so each becomes its own `go test` invocation — executed one after another, they forfeit exactly the parallelism narrowing was supposed to buy. Output stays readable by promotion: the front invocation streams live, later ones buffer, and each is flushed in submission order as the front finishes.