[SPARK-963] Wait for SparkListenerBus eventQueue to be empty before checking jobLogger state

core/src/test/scala/org/apache/spark/scheduler/JobLoggerSuite.scala

@@ -31,6 +31,7 @@ import org.apache.spark.rdd.RDD
 
 
 class JobLoggerSuite extends FunSuite with LocalSparkContext with ShouldMatchers {
+  val WAIT_TIMEOUT_MILLIS = 10000
 
   test("inner method") {
     sc = new SparkContext("local", "joblogger")
@@ -92,6 +93,8 @@ class JobLoggerSuite extends FunSuite with LocalSparkContext with ShouldMatchers
     val rdd = sc.parallelize(1 to 1e2.toInt, 4).map{ i => (i % 12, 2 * i) }
     rdd.reduceByKey(_+_).collect()
 
+    assert(sc.dagScheduler.listenerBus.waitUntilEmpty(WAIT_TIMEOUT_MILLIS))
+
     val user = System.getProperty("user.name", SparkContext.SPARK_UNKNOWN_USER)
     
     joblogger.getLogDir should be ("/tmp/spark-%s".format(user))
@@ -120,7 +123,9 @@ class JobLoggerSuite extends FunSuite with LocalSparkContext with ShouldMatchers
     sc.addSparkListener(joblogger)
     val rdd = sc.parallelize(1 to 1e2.toInt, 4).map{ i => (i % 12, 2 * i) }
     rdd.reduceByKey(_+_).collect()
-    
+
+    assert(sc.dagScheduler.listenerBus.waitUntilEmpty(WAIT_TIMEOUT_MILLIS))
+
     joblogger.onJobStartCount should be (1)
     joblogger.onJobEndCount should be (1)
     joblogger.onTaskEndCount should be (8)