@Override
    public Comparable getHighEndPoint() {
        return highEndPoint;
    }
@Test
    void getHighEndPoint() {
        final Integer highEndPoint = 15;
        final RangeImpl rangeImpl = new RangeImpl(Range.RangeBoundary.OPEN, 1, highEndPoint, Range.RangeBoundary.CLOSED);
        assertThat(rangeImpl.getHighEndPoint()).isEqualTo(highEndPoint);
    }