this.expectedElements = Helpers.copyToList(expectedElements);
    this.knownOrder = knownOrder;
    this.startIndex = startIndex;
  }

  /**
   * I'd like to make this a parameter to the constructor, but I can't because the stimulus
   * instances refer to {@code this}.
   */
  protected abstract Iterable<? extends Stimulus<E, ? super I>> getStimulusValues();

  /**

    this.expectedElements = Helpers.copyToList(expectedElements);
    this.knownOrder = knownOrder;
    this.startIndex = startIndex;
  }

  /**
   * I'd like to make this a parameter to the constructor, but I can't because the stimulus
   * instances refer to {@code this}.
   */
  protected abstract Iterable<? extends Stimulus<E, ? super I>> getStimulusValues();

  /**