@Test
public void shouldCompareTwoConcreteValuesUsingTheirComparator() {

    // given
    RangeBoundary<Integer> boundaryA = new RangeBoundary<Integer>(10);
    RangeBoundary<Integer> boundaryB = new RangeBoundary<Integer>(5);
    // then
    assertThat(boundaryA.compareTo(boundaryB)).isGreaterThan(0);
}