public void testGenericInterface() {
    // test the 1st generic interface on the class
    Type fType = Supplier.class.getTypeParameters()[0];
    assertEquals(
        Integer.class, TypeToken.of(IntegerStringFunction.class).resolveType(fType).getRawType());

    // test the 2nd generic interface on the class
    Type predicateParameterType = Predicate.class.getTypeParameters()[0];
    assertEquals(

        CURRENT = JAVA6;
      }
    }

    abstract Type newArrayType(Type componentType);

    abstract Type usedInGenericType(Type type);

    final ImmutableList<Type> usedInGenericType(Type[] types) {
      ImmutableList.Builder<Type> builder = ImmutableList.builder();
      for (Type type : types) {
        builder.add(usedInGenericType(type));
      }
      return builder.build();
    }