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https://issues.apache.org/jira/browse/MRUNIT-158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13502157#comment-13502157
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Patrick Hunt commented on MRUNIT-158:
-------------------------------------

I will create/reopen the hadoop jira.

Seems like the previous comment about printing a warning message is a good one 
- anyone can create a writable and if there is an issue with it not being 
compatible with mrunit having the user get notified would be useful. Providing 
insight into how to get around the issue (ie using run()) would be even more 
useful.
                
> withOutput doesn't generate useful information with MapWritable on error
> ------------------------------------------------------------------------
>
>                 Key: MRUNIT-158
>                 URL: https://issues.apache.org/jira/browse/MRUNIT-158
>             Project: MRUnit
>          Issue Type: Improvement
>    Affects Versions: 0.9.0
>            Reporter: Patrick Hunt
>            Priority: Minor
>
> Using withOutput generates the following, notice that the hashcode is printed 
> rather than some useful detail as to the content of the maps:
> Nov 9, 2012 2:40:01 PM org.apache.hadoop.mrunit.TestDriver logError
> SEVERE: Missing expected output (null-0, org.apache.hadoop.io.MapWritable@e1) 
> at position 0.
> Nov 9, 2012 2:40:01 PM org.apache.hadoop.mrunit.TestDriver logError
> SEVERE: Received unexpected output (null-0, 
> org.apache.hadoop.io.MapWritable@2059) at position 0.

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