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

    https://github.com/apache/spark/pull/3651#discussion_r21585931
  
    --- Diff: pom.xml ---
    @@ -941,19 +950,38 @@
                 <fork>true</fork>
               </configuration>
             </plugin>
    +        <!-- Surefire runs all Java tests -->
             <plugin>
               <groupId>org.apache.maven.plugins</groupId>
               <artifactId>maven-surefire-plugin</artifactId>
    -          <version>2.17</version>
    +          <version>2.18</version>
    +          <!-- Note config is repeated in scalatest config -->
               <configuration>
    -            <!-- Uses scalatest instead -->
    -            <skipTests>true</skipTests>
    +            <includes>
    +              <include>**/Test*.java</include>
    +              <include>**/*Test.java</include>
    +              <include>**/*TestCase.java</include>
    +              <include>**/*Suite.java</include>
    +            </includes>
    +            
<reportsDirectory>${project.build.directory}/surefire-reports</reportsDirectory>
    +            <argLine>-Xmx3g -XX:MaxPermSize=${MaxPermGen} 
-XX:ReservedCodeCacheSize=512m</argLine>
    +            <systemProperties>
    +              <java.awt.headless>true</java.awt.headless>
    +              
<spark.test.home>${session.executionRootDirectory}</spark.test.home>
    +              <spark.testing>1</spark.testing>
    +              <spark.ui.enabled>false</spark.ui.enabled>
    +              
<spark.ui.showConsoleProgress>false</spark.ui.showConsoleProgress>
    +              
<spark.executor.extraClassPath>${test_classpath}</spark.executor.extraClassPath>
    +              
<spark.driver.allowMultipleContexts>true</spark.driver.allowMultipleContexts>
    +            </systemProperties>
               </configuration>
             </plugin>
    +        <!-- Scalatest runs all Scala tests -->
    --- End diff --
    
    It probably is; I had not tried it just yet. I do think this is a precursor 
to more change, potentially using `surefire` for everything.


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