@Test
  public void testScanAtRegionBoundary() throws Exception {
    testScan(222, true, 333, true, -1);
    testScan(333, true, 444, false, -1);
    testScan(444, false, 555, true, -1);
    testScan(555, false, 666, false, -1);
  }
Used by implementation classes to assert the correctness of spans having errors.
hbase-server/src/test/java/org/apache/hadoop/hbase/client/AbstractTestAsyncTableScan.java