Fixed the failing test.

core/src/test/scala/spark/AccumulatorSuite.scala

@@ -13,6 +13,20 @@ class AccumulatorSuite extends FunSuite with ShouldMatchers with BeforeAndAfter
 
   var sc: SparkContext = null
 
+  implicit def setAccum[A] = new AccumulableParam[mutable.Set[A], A] {
+    def addInPlace(t1: mutable.Set[A], t2: mutable.Set[A]) : mutable.Set[A] = {
+      t1 ++= t2
+      t1
+    }
+    def addAccumulator(t1: mutable.Set[A], t2: A) : mutable.Set[A] = {
+      t1 += t2
+      t1
+    }
+    def zero(t: mutable.Set[A]) : mutable.Set[A] = {
+      new mutable.HashSet[A]()
+    }
+  }
+
   after {
     if (sc != null) {
       sc.stop()
@@ -40,7 +54,6 @@ class AccumulatorSuite extends FunSuite with ShouldMatchers with BeforeAndAfter
   }
 
   test ("add value to collection accumulators") {
-    import SetAccum._
     val maxI = 1000
     for (nThreads <- List(1, 10)) { //test single & multi-threaded
       sc = new SparkContext("local[" + nThreads + "]", "test")
@@ -60,22 +73,7 @@ class AccumulatorSuite extends FunSuite with ShouldMatchers with BeforeAndAfter
     }
   }
 
-  implicit object SetAccum extends AccumulableParam[mutable.Set[Any], Any] {
-    def addInPlace(t1: mutable.Set[Any], t2: mutable.Set[Any]) : mutable.Set[Any] = {
-      t1 ++= t2
-      t1
-    }
-    def addAccumulator(t1: mutable.Set[Any], t2: Any) : mutable.Set[Any] = {
-      t1 += t2
-      t1
-    }
-    def zero(t: mutable.Set[Any]) : mutable.Set[Any] = {
-      new mutable.HashSet[Any]()
-    }
-  }
-
   test ("value not readable in tasks") {
-    import SetAccum._
     val maxI = 1000
     for (nThreads <- List(1, 10)) { //test single & multi-threaded
       sc = new SparkContext("local[" + nThreads + "]", "test")
@@ -123,7 +121,6 @@ class AccumulatorSuite extends FunSuite with ShouldMatchers with BeforeAndAfter
   }
 
   test ("localValue readable in tasks") {
-    import SetAccum._
     val maxI = 1000
     for (nThreads <- List(1, 10)) { //test single & multi-threaded
       sc = new SparkContext("local[" + nThreads + "]", "test")
@@ -135,7 +132,7 @@ class AccumulatorSuite extends FunSuite with ShouldMatchers with BeforeAndAfter
       }
       acc.value should be ( (0 to maxI).toSet)
       sc.stop()
-      sc = null      
+      sc = null
     }
   }