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

    https://github.com/apache/spark/pull/6423#discussion_r32173860
  
    --- Diff: 
core/src/test/scala/org/apache/spark/storage/ShuffleBlockFetcherIteratorSuite.scala
 ---
    @@ -57,7 +58,16 @@ class ShuffleBlockFetcherIteratorSuite extends 
SparkFunSuite {
         transfer
       }
     
    -  private val conf = new SparkConf
    +  // Create a mock managed buffer for testing
    +  def createMockManagedBuffer(): ManagedBuffer = {
    +    val mockManagedBuffer = mock(classOf[ManagedBuffer])
    +    when(mockManagedBuffer.createInputStream()).thenAnswer(new 
Answer[InputStream] {
    --- End diff --
    
    Can you use the simpler 
when(mockManagedBuffer.createInputStream()).thenReturn(mock(classOf[InputStream]))?


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