private void assertContains(RegionVersionHolder h, long... versions) {
    LongStream.of(versions).forEach(version -> {
      assertThat(h.contains(version))
          .withFailMessage("Did not contain %s", version)
          .isTrue();
    });
  }
Tests of how the RegionVersionHolder maintains it's bitset under updates
geode-core/src/test/java/org/apache/geode/internal/cache/versions/RegionVersionHolderBitSetJUnitTest.java