@Override
    public Optional<RegionObserver> getRegionObserver() {
      return Optional.of(this);
    }
Test a table creation including a coprocessor path which is not whitelisted. Table will not be
created due to the offending coprocessor.
hbase-server/src/test/java/org/apache/hadoop/hbase/security/access/TestCoprocessorWhitelistMasterObserver.java