public final boolean isDifficultyTransitionPoint(final int previousHeight) {
        return ((previousHeight + 1) % this.getInterval()) == 0;
    }
@Test
    public void isDifficultyTransitionPoint() {
        assertFalse(BITCOIN_PARAMS.isDifficultyTransitionPoint(2014));
        assertTrue(BITCOIN_PARAMS.isDifficultyTransitionPoint(2015));
        assertFalse(BITCOIN_PARAMS.isDifficultyTransitionPoint(2016));
    }