Github user jiangxb1987 commented on the issue:
https://github.com/apache/spark/pull/22165
Actually my original thinking was like this:
```
val state = new ContextBarrierState(barrierId, numTasks)
val requester = mockRequester()
val request = forgeRequest(numTasks, stageId, stageAttemptId,
taskAttemptId, barrierEpoch)
state.handleRequest(requester, request)
// Verify states
...
// Verify cleanup
...
```
So you don't have to launch a SparkContext for the test. Could you please
check whether this is feasible?
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