func TestJSONBuiltinMarshalFieldKnownErrors(t *testing.T) {
	var m runtime.JSONBuiltin
	for _, fixt := range builtinKnownErrors {
		buf, err := m.Marshal(fixt.data)
		if err != nil {
			t.Errorf("m.Marshal(%v) failed with %v; want success", fixt.data, err)
		}
		if got, want := string(buf), fixt.json; got == want {
			t.Errorf("surprisingly got = %q; as want %q; data = %#v", got, want, fixt.data)
		}
	}
}
func TestJSONBuiltinMarshal(t *testing.T) {
	var m runtime.JSONBuiltin
	msg := examplepb.SimpleMessage{
		Id: "foo",
	}

	buf, err := m.Marshal(&msg)
	if err != nil {
		t.Errorf("m.Marshal(%v) failed with %v; want success", &msg, err)
	}

	var got examplepb.SimpleMessage
	if err := json.Unmarshal(buf, &got); err != nil {
		t.Errorf("json.Unmarshal(%q, &got) failed with %v; want success", buf, err)
	}
	if want := msg; !reflect.DeepEqual(got, want) {
		t.Errorf("got = %v; want %v", &got, &want)
	}
}