@Override
    public TaskNameGrouper build(Config config) {
      return new GroupByContainerCountOverride(new JobConfig(config).getContainerCount());
    }
Groups all SSPs into two tasks. The first task gets all of the SSPs with a partition id of 0. The second task gets
all other SSPs. This is used for testing a custom {@link SystemStreamPartitionGrouper}.
samza-core/src/test/java/org/apache/samza/coordinator/TestJobModelCalculator.java