public void testSerializableOnReturnValues_good() throws Exception {
    tester.forAllPublicStaticMethods(GoodSerializableFactory.class).testSerializable();
  }

  public static final class GoodSerializableFactory {
    public static Object good(Runnable r) {
      return r;
    }

    public static Object good(AnInterface i) {
      return i;
    }

            }
        }

        // and interfaces
        Class<?>[] interfaces = clazz.getInterfaces();

        for (Class<?> anInterface : interfaces) {
            Method interfaceMethod = getPublicMethod(anInterface, name, paramTypes);

            if (interfaceMethod != null) {
                return interfaceMethod;
            }
        }

        return null;
    }