func TestJSONBuiltinDecoderFields(t *testing.T) {
	var m runtime.JSONBuiltin
	for _, fixt := range builtinFieldFixtures {
		r := strings.NewReader(fixt.json)
		dec := m.NewDecoder(r)
		dest := reflect.New(reflect.TypeOf(fixt.data))
		if err := dec.Decode(dest.Interface()); err != nil {
			t.Errorf("dec.Decode(dest) failed with %v; want success; data = %q", err, fixt.json)
		}

		if got, want := dest.Elem().Interface(), fixt.data; !reflect.DeepEqual(got, want) {
			t.Errorf("got = %v; want = %v; input = %q", got, want, fixt.json)
		}
	}
}
func TestJSONBuiltinDecoder(t *testing.T) {
	var (
		m   runtime.JSONBuiltin
		got examplepb.SimpleMessage

		data = `{"id": "foo"}`
	)
	r := strings.NewReader(data)
	dec := m.NewDecoder(r)
	if err := dec.Decode(&got); err != nil {
		t.Errorf("m.Unmarshal(&got) failed with %v; want success", err)
	}

	want := examplepb.SimpleMessage{
		Id: "foo",
	}
	if !reflect.DeepEqual(got, want) {
		t.Errorf("got = %v; want = %v", &got, &want)
	}
}