Ensure SynchronizedBuffer is used in every TestSuiteBase

Author: tdas

streaming/src/test/scala/org/apache/spark/streaming/TestSuiteBase.scala

@@ -74,7 +74,7 @@ class TestInputStream[T: ClassTag](ssc_ : StreamingContext, input: Seq[Seq[T]],
  * The buffer contains a sequence of RDD's, each containing a sequence of items
  */
 class TestOutputStream[T: ClassTag](parent: DStream[T],
-    val output: ArrayBuffer[Seq[T]] = ArrayBuffer[Seq[T]]())
+    val output: SynchronizedBuffer[Seq[T]] = new ArrayBuffer[Seq[T]] with SynchronizedBuffer[Seq[T]])
   extends ForEachDStream[T](parent, (rdd: RDD[T], t: Time) => {
     val collected = rdd.collect()
     output += collected
@@ -95,8 +95,10 @@ class TestOutputStream[T: ClassTag](parent: DStream[T],
  * The buffer contains a sequence of RDD's, each containing a sequence of partitions, each
  * containing a sequence of items.
  */
-class TestOutputStreamWithPartitions[T: ClassTag](parent: DStream[T],
-    val output: ArrayBuffer[Seq[Seq[T]]] = ArrayBuffer[Seq[Seq[T]]]())
+class TestOutputStreamWithPartitions[T: ClassTag](
+    parent: DStream[T],
+    val output: SynchronizedBuffer[Seq[Seq[T]]] =
+      new ArrayBuffer[Seq[Seq[T]]] with SynchronizedBuffer[Seq[Seq[T]]])
   extends ForEachDStream[T](parent, (rdd: RDD[T], t: Time) => {
     val collected = rdd.glom().collect().map(_.toSeq)
     output += collected
@@ -108,10 +110,6 @@ class TestOutputStreamWithPartitions[T: ClassTag](parent: DStream[T],
     ois.defaultReadObject()
     output.clear()
   }
-
-  def toTestOutputStream: TestOutputStream[T] = {
-    new TestOutputStream[T](this.parent, this.output.map(_.flatten))
-  }
 }
 
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