1 files changed, 89 insertions, 0 deletions
diff --git a/core/src/test/scala/org/apache/spark/util/AccumulatorV2Suite.scala b/core/src/test/scala/org/apache/spark/util/AccumulatorV2Suite.scala
new file mode 100644
index 0000000000..41cdd02492
--- /dev/null
+++ b/core/src/test/scala/org/apache/spark/util/AccumulatorV2Suite.scala
@@ -0,0 +1,89 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.util
+
+import org.apache.spark.{DoubleAccumulator, LongAccumulator, SparkFunSuite}
+
+class AccumulatorV2Suite extends SparkFunSuite {
+
+  test("LongAccumulator add/avg/sum/count/isZero") {
+    val acc = new LongAccumulator
+    assert(acc.isZero)
+    assert(acc.count == 0)
+    assert(acc.sum == 0)
+    assert(acc.avg.isNaN)
+
+    acc.add(0)
+    assert(!acc.isZero)
+    assert(acc.count == 1)
+    assert(acc.sum == 0)
+    assert(acc.avg == 0.0)
+
+    acc.add(1)
+    assert(acc.count == 2)
+    assert(acc.sum == 1)
+    assert(acc.avg == 0.5)
+
+    // Also test add using non-specialized add function
+    acc.add(new java.lang.Long(2))
+    assert(acc.count == 3)
+    assert(acc.sum == 3)
+    assert(acc.avg == 1.0)
+
+    // Test merging
+    val acc2 = new LongAccumulator
+    acc2.add(2)
+    acc.merge(acc2)
+    assert(acc.count == 4)
+    assert(acc.sum == 5)
+    assert(acc.avg == 1.25)
+  }
+
+  test("DoubleAccumulator add/avg/sum/count/isZero") {
+    val acc = new DoubleAccumulator
+    assert(acc.isZero)
+    assert(acc.count == 0)
+    assert(acc.sum == 0.0)
+    assert(acc.avg.isNaN)
+
+    acc.add(0.0)
+    assert(!acc.isZero)
+    assert(acc.count == 1)
+    assert(acc.sum == 0.0)
+    assert(acc.avg == 0.0)
+
+    acc.add(1.0)
+    assert(acc.count == 2)
+    assert(acc.sum == 1.0)
+    assert(acc.avg == 0.5)
+
+    // Also test add using non-specialized add function
+    acc.add(new java.lang.Double(2.0))
+    assert(acc.count == 3)
+    assert(acc.sum == 3.0)
+    assert(acc.avg == 1.0)
+
+    // Test merging
+    val acc2 = new DoubleAccumulator
+    acc2.add(2.0)
+    acc.merge(acc2)
+    assert(acc.count == 4)
+    assert(acc.sum == 5.0)
+    assert(acc.avg == 1.25)
+  }
+}