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

    https://github.com/apache/spark/pull/9106#discussion_r42018933
  
    --- Diff: 
core/src/test/scala/org/apache/spark/util/MutableURLClassLoaderSuite.scala ---
    @@ -19,9 +19,15 @@ package org.apache.spark.util
     
     import java.net.URLClassLoader
     
    +import scala.collection.JavaConverters._
    +
     import org.apache.spark.{SparkContext, SparkException, SparkFunSuite, 
TestUtils}
     
    -class MutableURLClassLoaderSuite extends SparkFunSuite {
    +import org.scalatest.Matchers
    --- End diff --
    
    nit: these imports should come before `org.apache.spark`. Also, nuke one of 
the empty lines before the class declaration.


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