@Test
 public void testConverters() {
   NativeManager manager = new NativeManager();
   TestConverter converter = new TestConverter();
   Type1 t1 = new Type1(10);
   Type2 t2 = new Type2(10);
   manager.registerConverter(converter);
   assertThat((Type2) manager.toNative(t1)).isEqualTo(t2);
   assertThat((Type1) manager.toNova(t2)).isEqualTo(t1);
 }