race:     true,
			runTests: "Output",
			pkg:      "runtime/race",
		})
	t.registerTest(hdr,
		&goTest{
			variant:  "race",
			race:     true,
			runTests: "TestParse|TestEcho|TestStdinCloseRace|TestClosedPipeRace|TestTypeRace|TestFdRace|TestFdReadRace|TestFileCloseRace",
			pkgs:     []string{"flag", "net", "os", "os/exec", "encoding/gob"},
		})
	// We don't want the following line, because it

	if len(args) == 0 {
		args = []string{"y"}
	}
	s := strings.Join(args, " ") + "\n"
	for {
		_, err := os.Stdout.WriteString(s)
		if err != nil {
			os.Exit(1)
		}
	}
}

func TestEcho(t *testing.T) {
	t.Parallel()

	bs, err := helperCommand(t, "echo", "foo bar", "baz").Output()
	if err != nil {
		t.Errorf("echo: %v", err)
	}
	if g, e := string(bs), "foo bar baz\n"; g != e {