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https://issues.apache.org/jira/browse/HADOOP-5518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12696671#action_12696671
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Hudson commented on HADOOP-5518:
--------------------------------
Integrated in Hadoop-trunk #800 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/800/])
. Add contrib/mrunit, a MapReduce unit test framework. Contributed by
Aaron Kimball.
> MRUnit unit test library
> ------------------------
>
> Key: HADOOP-5518
> URL: https://issues.apache.org/jira/browse/HADOOP-5518
> Project: Hadoop Core
> Issue Type: New Feature
> Reporter: Aaron Kimball
> Assignee: Aaron Kimball
> Fix For: 0.21.0
>
> Attachments: HADOOP-5518-2.patch, HADOOP-5518-3.patch, mrunit.patch,
> overview.html
>
>
> MRUnit is a tool to help authors of MapReduce programs write unit tests.
> Testing map() and reduce() methods requires some repeated work to mock the
> inputs and outputs of a Mapper or Reducer class, and ensure that the correct
> values are emitted to the OutputCollector based on inputs. Also, testing a
> mapper and reducer together requires running them with the sorted ordering
> guarantees made by the shuffle process.
> This library provides the above functionality to authors of maps and reduces;
> it allows you to test maps, reduces, and map-reduce pairs without needing to
> perform all the setup and teardown work associated with running a job.
> I believe this tool may be useful to the broader Hadoop community, so I have
> cleaned it up and would like to see it become a "contrib" module. My current
> environment is based on Hadoop 0.18, so this is the format it expects to use.
> It does not have support for the new Context-based interfaces for
> mappers/reducers.
> I have attached the overview.html file for its javadoc, which provides more
> synopsis and an example of usage; I am also providing the current source code
> so that you can evaluate its structure.
> Ideally with some feedback from the community this will move toward
> supporting the current trunk interface soon.
> This currently works with JUnit 4; the supplied patch changes Ivy's
> libraries.properties file to use JUnit 4.5. I'm marking HADOOP-4901 as a
> dependency for this reason.
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