@Test
void testToString() {

    final RollUpBitMask rowKeyBitMap = RollUpBitMask
            .fromMask(new short[]{0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1});
    assertThat(rowKeyBitMap.toString()).isEqualTo("100000000010010");
}