// Alpine does not output groups; see https://golang.org/issue/19938.
	if !strings.HasPrefix(strOut, expected) {
		t.Errorf("expected prefix: %q", expected)
	}
}

func TestGroupCleanupUserNamespace(t *testing.T) {
	testenv.MustHaveExecPath(t, "id")
	cmd := testenv.Command(t, "id")
	uid, gid := os.Getuid(), os.Getgid()
	cmd.SysProcAttr = &syscall.SysProcAttr{
		Cloneflags: syscall.CLONE_NEWUSER,