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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