Fixed broken tests

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

@@ -30,11 +30,8 @@ class SparkListenerSuite extends FunSuite with LocalSparkContext with ShouldMatc
   /** Length of time to wait while draining listener events. */
   val WAIT_TIMEOUT_MILLIS = 10000
 
-  before {
-    sc = new SparkContext("local", "DAGSchedulerSuite")
-  }
-
   test("basic creation of StageInfo") {
+    sc = new SparkContext("local", "DAGSchedulerSuite")
     val listener = new SaveStageInfo
     sc.addSparkListener(listener)
     val rdd1 = sc.parallelize(1 to 100, 4)
@@ -55,6 +52,7 @@ class SparkListenerSuite extends FunSuite with LocalSparkContext with ShouldMatc
   }
 
   test("StageInfo with fewer tasks than partitions") {
+    sc = new SparkContext("local", "DAGSchedulerSuite")
     val listener = new SaveStageInfo
     sc.addSparkListener(listener)
     val rdd1 = sc.parallelize(1 to 100, 4)
@@ -70,6 +68,7 @@ class SparkListenerSuite extends FunSuite with LocalSparkContext with ShouldMatc
   }
 
   test("local metrics") {
+    sc = new SparkContext("local", "DAGSchedulerSuite")
     val listener = new SaveStageInfo
     sc.addSparkListener(listener)
     sc.addSparkListener(new StatsReportListener)