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

    https://github.com/apache/drill/pull/984#discussion_r147262655
  
    --- Diff: 
exec/java-exec/src/test/java/org/apache/drill/test/ExampleTest.java ---
    @@ -59,6 +59,9 @@
     @Ignore
     public class ExampleTest {
     
    +  @Rule
    +  public final DirTestWatcher dirTestWatcher = new DirTestWatcher();
    --- End diff --
    
    I added java doc, and added example of how it's used in secondTest


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