@Override
      public RSGroupInfo answer(InvocationOnMock invocation) throws Throwable {
        return groupMap.get(invocation.getArgument(0));
      }
Construct table descriptors evenly distributed between the groups.
@param hasBogusTable there is a table that does not determine the group
@return the list of table descriptors
hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/RSGroupableBalancerTestBase.java