class FourTypeArgs<T1, T2, T3, T4> {}
    class ThreeTypeArgs<T1, T2, T3> extends FourTypeArgs<T1, T2, T3, String> {}
    TypeToken<FourTypeArgs<T, Integer, ?, ?>> supertype =
        new TypeToken<FourTypeArgs<T, Integer, ?, ?>>() {};
    TypeToken<ThreeTypeArgs<T, Integer, String>> subtype =
        new TypeToken<ThreeTypeArgs<T, Integer, String>>() {};
    assertTrue(subtype.isSubtypeOf(supertype));