who runs the map and reduce tasks in the unit tests

[Pedro Sá da Costa]

Hi,

In Hadoop MR unit tests, the classes uses the
./core/org/apache/hadoop/util/Tool.java, and
./core/org/apache/hadoop/util/ToolRunner.java tosubmit the job. But to
run the unit tests it seems that it's not needed the MR be running. If
so, who runs the map and reduce tasks?


-- 
Best regards,
P