@TestSubtype(suppressGetSupertype = true, suppressGetSubtype = true)
    public <T> Iterable<?> wildcardsMatchByUpperBound(List<? extends T> list) {
      return isSubtype(list);
    }

    @TestSubtype(suppressGetSupertype = true, suppressGetSubtype = true)
    public <T> Iterable<? extends T> wildCardsDoNotMatchByUpperBound(List<?> list) {
      return notSubtype(list);
    }

    @TestSubtype(suppressGetSupertype = true, suppressGetSubtype = true)
    public <T> Iterable<?> wildcardsMatchByUpperBound(List<? extends T> list) {
      return isSubtype(list);
    }

    @TestSubtype(suppressGetSupertype = true, suppressGetSubtype = true)
    public <T> Iterable<? extends T> wildCardsDoNotMatchByUpperBound(List<?> list) {
      return notSubtype(list);
    }

 * assert as subtypes are really subtypes according to javac. For example:
 *
 * {@snippet :
 * class MySubtypeTests extends SubtypeTester {
 *   @TestSubtype(suppressGetSubtype = true, suppressGetSupertype = true)
 *   public <T> Iterable<? extends T> listIsSubtypeOfIterable(List<T> list) {
 *     return isSubtype(list);
 *   }
 *
 *   @TestSubtype