private ProcedureCoordinator buildNewCoordinator() {
    ThreadPoolExecutor pool = ProcedureCoordinator.defaultPool(nodeName, 1, POOL_KEEP_ALIVE);
    return spy(new ProcedureCoordinator(controller, pool));
  }
Test Procedure coordinator operation.
<p>
This only works correctly when we do <i>class level parallelization</i> of tests. If we do method
level serialization this class will likely throw all kinds of errors.
hbase-server/src/test/java/org/apache/hadoop/hbase/procedure/TestProcedureCoordinator.java