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