Github user JoshRosen commented on the pull request:

    https://github.com/apache/spark/pull/3737#issuecomment-67661702
  
    I think a few of the skipped lines themselves are okay, since 
[L354](https://gist.github.com/JoshRosen/c09a742805bae3503185#file-spark_ec2-py-cover-L353),
 is similar to some calls right below it that were actually run.  On the other 
hand, the fact that we didn't run the VPC code path means that we didn't end up 
calling `run` with the VPC arguments, so it's still possible that those could 
error out.
    
    This is one of those cases where line coverage is kind of a minimum 
standard but not the end-all of coverage metrics, since it doesn't capture the 
space of different configurations / arguments that we call Boto with.
    
    Since I've got to launch a cluster anyways, I'll try spinning up one more 
in a VPC just to be safe.
    
    Good call on the `setup_standalone_cluster` code, by the way; it looks 
unused, so I'll remove it.


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