Github user Ngone51 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21440#discussion_r191176828
--- Diff:
core/src/test/scala/org/apache/spark/io/ChunkedByteBufferFileRegionSuite.scala
---
@@ -0,0 +1,154 @@
+/*
+ * 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.io
+
+import java.nio.ByteBuffer
+import java.nio.channels.WritableByteChannel
+
+import scala.util.Random
+
+import org.mockito.Mockito.when
+import org.scalatest.BeforeAndAfterEach
+import org.scalatest.mockito.MockitoSugar
+
+import org.apache.spark.{SparkConf, SparkEnv, SparkFunSuite}
+import org.apache.spark.internal.config
+import org.apache.spark.util.io.ChunkedByteBuffer
+
+class ChunkedByteBufferFileRegionSuite extends SparkFunSuite with
MockitoSugar
+ with BeforeAndAfterEach {
+
+ override protected def beforeEach(): Unit = {
+ super.beforeEach()
+ val conf = new SparkConf()
+ val env = mock[SparkEnv]
+ SparkEnv.set(env)
+ when(env.conf).thenReturn(conf)
+ }
+
+ override protected def afterEach(): Unit = {
+ SparkEnv.set(null)
+ }
+
+ private def generateChunkByteBuffer(nChunks: Int, perChunk: Int):
ChunkedByteBuffer = {
--- End diff --
nit: generateChunk**ed**ByteBuffer
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