* {@code setCount()} to throw an exception, as checking the return value could produce an
   * incorrect error message like "setCount() should return the original count" instead of the
   * message passed to a later invocation of {@code fail()}, like "setCount should throw
   * UnsupportedOperationException."
   */
  abstract void setCountNoCheckReturnValue(E element, int count);

   * {@code setCount()} to throw an exception, as checking the return value could produce an
   * incorrect error message like "setCount() should return the original count" instead of the
   * message passed to a later invocation of {@code fail()}, like "setCount should throw
   * UnsupportedOperationException."
   */
  abstract void setCountNoCheckReturnValue(E element, int count);