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https://issues.apache.org/jira/browse/SPARK-4442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14284069#comment-14284069
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Matthew Cornell commented on SPARK-4442:
----------------------------------------

Thanks for sticking with me on this, Sean! I tried again from scratch with no 
luck. Maybe the downloaded sources have something crucial missing from master? 
Here's what I did:

# start with extracting 
http://apache.spinellicreations.com/spark/spark-1.2.0/spark-1.2.0.tgz
$ cd /Users/cornell/Downloads/spark-1.2.0/
$ mvn -DskipTests install
$ cd core
$ mvn jar:test-jar

-> same warning:
[WARNING] JAR will be empty - no content was marked for inclusion!


> Move common unit test utilities into their own package / module
> ---------------------------------------------------------------
>
>                 Key: SPARK-4442
>                 URL: https://issues.apache.org/jira/browse/SPARK-4442
>             Project: Spark
>          Issue Type: Improvement
>            Reporter: Josh Rosen
>            Priority: Minor
>
> We should move generally-useful unit test fixtures / utility methods to their 
> own test utilities set package / module to make them easier to find / use.
> See https://github.com/apache/spark/pull/3121#discussion-diff-20413659 for 
> one example of this.



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