public Builder awaitTermination(long timeout, TimeUnit unit) {
      enableAwaitTermination = true;
      awaitTerminationTimeout = timeout;
      awaitTerminationTimeUnit = unit;
      return this;
    }
Enables invocation of {@code awaitTermination} during {@code tearDown}. Default is disabled.

@param timeout the maximum time to wait
@param unit the time unit of the timeout argument
@return a reference to this builder
geode-junit/src/main/java/org/apache/geode/test/junit/rules/ExecutorServiceRule.java