private TableDescriptor createBasic3FamilyHTD(String tableName) {
    return TableDescriptorBuilder.newBuilder(TableName.valueOf(tableName))
      .setColumnFamily(ColumnFamilyDescriptorBuilder.of("a"))
      .setColumnFamily(ColumnFamilyDescriptorBuilder.of("b"))
      .setColumnFamily(ColumnFamilyDescriptorBuilder.of("c")).build();
  }
Creates an HRI around an HTD that has <code>tableName</code>.
@param tableName Name of table to use.
hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestWALObserver.java