ti.name = fmt.Sprintf("gotest%d", suffix)
	xname, err := exec.LookPath("ip")
	if err != nil {
		return err
	}
	ti.setupCmds = append(ti.setupCmds, &exec.Cmd{
		Path: xname,
		Args: []string{"ip", "link", "add", ti.name, "type", "dummy"},
	})
	ti.setupCmds = append(ti.setupCmds, &exec.Cmd{
		Path: xname,
		Args: []string{"ip", "address", "add", ti.local, "peer", ti.remote, "dev", ti.name},
	})

	ti.name = fmt.Sprintf("gif%d", suffix)
	xname, err := exec.LookPath("ifconfig")
	if err != nil {
		return err
	}
	ti.setupCmds = append(ti.setupCmds, &exec.Cmd{
		Path: xname,
		Args: []string{"ifconfig", ti.name, "create"},
	})
	ti.setupCmds = append(ti.setupCmds, &exec.Cmd{
		Path: xname,
		Args: []string{"ifconfig", ti.name, "inet", ti.local, ti.remote},
	})

	"runtime"
	"strings"
	"testing"
	"time"
)

type testInterface struct {
	name         string
	local        string
	remote       string
	setupCmds    []*exec.Cmd
	teardownCmds []*exec.Cmd
}

func (ti *testInterface) setup() error {
	for _, cmd := range ti.setupCmds {
		if out, err := cmd.CombinedOutput(); err != nil {
			return fmt.Errorf("args=%v out=%q err=%v", cmd.Args, string(out), err)
		}
	}
	return nil
}

		s := setupSDS(t)
		c := s.Connect()
		s.Verify(c.RequestResponseAck(t, &discovery.DiscoveryRequest{ResourceNames: []string{rootResourceName}}), expectRoot)
		s.Verify(c.RequestResponseAck(t, &discovery.DiscoveryRequest{ResourceNames: []string{rootResourceName}}), expectRoot)
		c.ExpectNoResponse(t)
	})
	t.Run("parallel", func(t *testing.T) {
		s := setupSDS(t)
		cert := s.Connect()

// 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)