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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