@Test
void testGetRollUpPermutationsAsBooleansTagCountTwo() {

    final Set<List<Boolean>> perms = RollUpBitMask.getRollUpPermutationsAsBooleans(2);
    assertThat(perms.size()).isEqualTo(4);
    assertThat(perms.contains(Arrays.asList(false, false))).isTrue();
    assertThat(perms.contains(Arrays.asList(false, true))).isTrue();
    assertThat(perms.contains(Arrays.asList(true, false))).isTrue();
    assertThat(perms.contains(Arrays.asList(true, true))).isTrue();
}