// run. testFlags is the list of flags to pass to the test package.
//
// The caller must call setupCmd on the resulting exec.Cmd to set its directory
// and environment.
func (opts *goTest) buildArgs(t *tester) (build, run, pkgs, testFlags []string, setupCmd func(*exec.Cmd)) {
	run = append(run, "-count=1") // Disallow caching
	if opts.timeout != 0 {
		d := opts.timeout * time.Duration(t.timeoutScale)