private static void waitForSkippedSplits(final HMaster master,
    final long existingSkippedSplitCount) {
    TEST_UTIL.waitFor(TimeUnit.MINUTES.toMillis(5),
      new MatcherPredicate<>("waiting to observe split attempt and skipped.",
        () -> master.getRegionNormalizerManager().getSkippedCount(PlanType.SPLIT),
        Matchers.greaterThan(existingSkippedSplitCount)));
  }
A test for when a region is the target of both a split and a merge plan. Does not define
expected behavior, only that some change is applied to the table.
hbase-server/src/test/java/org/apache/hadoop/hbase/master/normalizer/TestSimpleRegionNormalizerOnCluster.java