return new Object();
          }

          @Override
          public Map<Object, Object> loadAll(Iterable<?> keys) throws Exception {
            Map<Object, Object> result = Maps.newHashMap();
            for (Object key : keys) {
              Object value = new Object();
              result.put(key, value);
              // add extra entries
              result.put(value, key);
            }

    assertHasArrayInterfaces(new TypeToken<NoInterface[]>() {});
  }

  public void testGetGenericInterfaces_withInterfaces() {
    Map<Class<?>, Type> interfaceMap = Maps.newHashMap();
    for (TypeToken<?> interfaceType :
        new TypeToken<Implementation<Integer, String>>() {}.getGenericInterfaces()) {
      interfaceMap.put(interfaceType.getRawType(), interfaceType.getType());
    }

    assertHasArrayInterfaces(new TypeToken<NoInterface[]>() {});
  }

  public void testGetGenericInterfaces_withInterfaces() {
    Map<Class<?>, Type> interfaceMap = Maps.newHashMap();
    for (TypeToken<?> interfaceType :
        new TypeToken<Implementation<Integer, String>>() {}.getGenericInterfaces()) {
      interfaceMap.put(interfaceType.getRawType(), interfaceType.getType());
    }