Github user jinxing64 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16867#discussion_r104344072
  
    --- Diff: 
core/src/test/scala/org/apache/spark/util/collection/MedianHeapSuite.scala ---
    @@ -0,0 +1,78 @@
    +/*
    + * 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.collection
    +
    +import java.util
    +import java.util.NoSuchElementException
    +
    +import scala.collection.mutable.ArrayBuffer
    +import scala.util.Random
    +
    +import org.apache.spark.SparkFunSuite
    +
    +class MedianHeapSuite extends SparkFunSuite {
    +
    +  test("If no numbers in MedianHeap, NoSuchElementException is thrown.") {
    +    val medianHeap = new MedianHeap()
    +    var valid = false
    +    try {
    +      medianHeap.findMedian()
    +    } catch {
    +      case e: NoSuchElementException =>
    +        valid = true
    +    }
    +
    +    assert(valid)
    +  }
    +
    +  test("Median should be correct when size of MedianHeap is ord or even") {
    +    val random = new Random()
    +    val medianHeap1 = new MedianHeap()
    +    val array1 = new Array[Int](100)
    +    (0 until 100).foreach {
    +      case i =>
    +        val randomNumber = random.nextInt(1000)
    +        medianHeap1.insert(randomNumber)
    +        array1(i) += randomNumber
    +    }
    +    util.Arrays.sort(array1)
    +    assert(medianHeap1.findMedian() === ((array1(49) + array1(50)) / 2.0))
    +
    +    val medianHeap2 = new MedianHeap()
    +    val array2 = new Array[Int](101)
    +    (0 until 101).foreach {
    +      case i =>
    +        val randomNumber = random.nextInt(1000)
    +        medianHeap2.insert(randomNumber)
    +        array2(i) += randomNumber
    +    }
    +    util.Arrays.sort(array2)
    +    assert(medianHeap2.findMedian() === array2(50))
    +  }
    +
    +  test("Size of Median should be correct though there are duplicated 
numbers inside.") {
    --- End diff --
    
    random.nextInt(100) returns value between 0(inclusive) and the specified 
value(exclusive). If I call it 1000 times, there must be duplicates.


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