private static final long serialVersionUID = 0;
  }

  /*
   * This is somewhat of a weak test; we verify that all of the methods are
   * correct, but not that they're actually forwarding correctly. We also rely
   * on the other tests (e.g., SynchronizedSetTest) to verify that the
   * collection views are synchronized correctly.
   */

  public void testSize() {
    int unused = create().size();
  }

 *
 * <p>Tests should inherit from this class, and declare subtyping relationship with public methods
 * annotated by {@link TestSubtype}.
 *
 * <p>These declaration methods rely on Java static type checking to make sure what we want to
 * assert as subtypes are really subtypes according to javac. For example:
 *
 * <pre>{@code
 * class MySubtypeTests extends SubtypeTester {