### Question:
HBCKMetaTableAccessor { public static void deleteRegionInfo(Connection connection, RegionInfo regionInfo) throws IOException { Delete delete = new Delete(regionInfo.getRegionName()); delete.addFamily(HConstants.CATALOG_FAMILY, HConstants.LATEST_TIMESTAMP); deleteFromMetaTable(connection, delete); LOG.info("Deleted {}", regionInfo.getRegionNameAsString()); } private  HBCKMetaTableAccessor(); static List<RegionInfo> getMergeRegions(Cell[] cells); static void deleteRegionInfo(Connection connection, RegionInfo regionInfo); static List<RegionInfo> getTableRegions(final Connection conn, final TableName table); static List<TableName> getTables(final Connection conn); static void addRegionToMeta(Connection conn, RegionInfo region); static List<RegionInfo> getAllRegions(Connection conn); static Map<TableName, TableState> getAllTablesStates(Connection conn); static byte[] getTableStartRowForMeta(TableName tableName); static byte[] getTableStopRowForMeta(TableName tableName); static byte[] getMetaKeyForRegion(RegionInfo regionInfo); static Put addLocation(Put p, ServerName sn, long openSeqNum, int replicaId); static int getRegionCount(final Connection connection, final TableName tableName); static TableState getTableState(Result r); static TableState getTableState(Connection conn, TableName tableName); static Put makePutFromTableState(TableState state, long ts); static Put makePutFromRegionInfo(RegionInfo region, long ts); static void deleteTableState(Connection connection, TableName table); static void updateTableState(Connection conn, TableName tableName,
    TableState.State actual); static RegionInfo getRegionInfo(final Result r, byte [] qualifier); @InterfaceAudience.Private // for use by HMaster#getTableRegionRow which is used for testing only static ServerName getServerName(final Result r, final int replicaId); static RegionLocations getRegionLocations(final Result r); static PairOfSameType<RegionInfo> getDaughterRegions(Result data); @VisibleForTesting static byte[] getServerColumn(int replicaId); @VisibleForTesting static byte[] getStartCodeColumn(int replicaId); @VisibleForTesting static byte[] getSeqNumColumn(int replicaId);  }### Answer:
@Test public void testDeleteRegionInfo() throws Exception { assertFalse(listRegionsInMeta().contains(createTableAnddeleteFirstRegion())); }