@Test
  public void testSimple() throws Exception {
    Table t = util.getConnection().getTable(tableName);
    Put p = new Put(row1);
    p.addColumn(test, dummy, dummy);
    // before HBASE-4331, this would throw an exception
    t.put(p);
    checkRowAndDelete(t, row1, 0);
    t.close();
  }
do a single put that is bypassed by a RegionObserver
hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestRegionObserverBypass.java