org.scalatest.exceptions.TestFailedDueToTimeoutException: The code passed to eventually never returned normally. Attempted 110 times over 10.038254423 seconds. Last failure message: Expected 500 events, but was 0.

sbt.ForkMain$ForkError: org.scalatest.exceptions.TestFailedDueToTimeoutException: The code passed to eventually never returned normally. Attempted 110 times over 10.038254423 seconds. Last failure message: Expected 500 events, but was 0.
	at org.scalatest.concurrent.Eventually$class.tryTryAgain$1(Eventually.scala:420)
	at org.scalatest.concurrent.Eventually$class.eventually(Eventually.scala:438)
	at org.scalatest.concurrent.Eventually$.eventually(Eventually.scala:478)
	at org.scalatest.concurrent.Eventually$class.eventually(Eventually.scala:307)
	at org.scalatest.concurrent.Eventually$.eventually(Eventually.scala:478)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite.writeAndVerify(FlumePollingStreamSuite.scala:117)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite.org$apache$spark$streaming$flume$FlumePollingStreamSuite$$testFlumePolling(FlumePollingStreamSuite.scala:81)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite$$anonfun$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(FlumePollingStreamSuite.scala:50)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite.org$apache$spark$streaming$flume$FlumePollingStreamSuite$$testMultipleTimes(FlumePollingStreamSuite.scala:66)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite$$anonfun$1.apply$mcV$sp(FlumePollingStreamSuite.scala:50)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite$$anonfun$1.apply(FlumePollingStreamSuite.scala:50)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite$$anonfun$1.apply(FlumePollingStreamSuite.scala:50)
	at org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)
	at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
	at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
	at org.scalatest.Transformer.apply(Transformer.scala:22)
	at org.scalatest.Transformer.apply(Transformer.scala:20)
	at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:166)
	at org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:42)
	at org.scalatest.FunSuiteLike$class.invokeWithFixture$1(FunSuiteLike.scala:163)
	at org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
	at org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
	at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)
	at org.scalatest.FunSuiteLike$class.runTest(FunSuiteLike.scala:175)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite.org$scalatest$BeforeAndAfter$$super$runTest(FlumePollingStreamSuite.scala:37)
	at org.scalatest.BeforeAndAfter$class.runTest(BeforeAndAfter.scala:200)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite.runTest(FlumePollingStreamSuite.scala:37)
	at org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)
	at org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)
	at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:413)
	at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401)
	at scala.collection.immutable.List.foreach(List.scala:318)
	at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)
	at org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:396)
	at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:483)
	at org.scalatest.FunSuiteLike$class.runTests(FunSuiteLike.scala:208)
	at org.scalatest.FunSuite.runTests(FunSuite.scala:1555)
	at org.scalatest.Suite$class.run(Suite.scala:1424)
	at org.scalatest.FunSuite.org$scalatest$FunSuiteLike$$super$run(FunSuite.scala:1555)
	at org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)
	at org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)
	at org.scalatest.SuperEngine.runImpl(Engine.scala:545)
	at org.scalatest.FunSuiteLike$class.run(FunSuiteLike.scala:212)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite.org$scalatest$BeforeAndAfter$$super$run(FlumePollingStreamSuite.scala:37)
	at org.scalatest.BeforeAndAfter$class.run(BeforeAndAfter.scala:241)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite.run(FlumePollingStreamSuite.scala:37)
	at org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:462)
	at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:671)
	at sbt.ForkMain$Run$2.call(ForkMain.java:296)
	at sbt.ForkMain$Run$2.call(ForkMain.java:286)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: sbt.ForkMain$ForkError: java.lang.AssertionError: Expected 500 events, but was 0
	at org.apache.spark.streaming.flume.PollingFlumeTestUtils.assertOutput(PollingFlumeTestUtils.scala:145)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite$$anonfun$writeAndVerify$1.apply$mcV$sp(FlumePollingStreamSuite.scala:123)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite$$anonfun$writeAndVerify$1.apply(FlumePollingStreamSuite.scala:117)
	at org.apache.spark.streaming.flume.FlumePollingStreamSuite$$anonfun$writeAndVerify$1.apply(FlumePollingStreamSuite.scala:117)
	at org.scalatest.concurrent.Eventually$class.makeAValiantAttempt$1(Eventually.scala:394)
	at org.scalatest.concurrent.Eventually$class.tryTryAgain$1(Eventually.scala:408)
	... 53 more