if !ok {
		t.Fatalf("test.v flag (type %T) does not have Get method", f)
	}
	v := gf.Get()

	var want any
	switch *testFlagArg {
	case "":
		want = false
	case "-test.v":
		want = true
	case "-test.v=test2json":
		want = "test2json"
	default:
		t.Fatalf("unexpected test_flag_arg %q", *testFlagArg)
	}

	if v != want {
		t.Errorf("test.v is %v want %v", v, want)
	}