Is there a way to test a reduce class with MRUnit that uses MultipleOutputFormat to write to multiple output files?
It looks like support for MultipleOutputs is still work in progress in the MRUnit Jira.
That being said, I found someone who implemented his own drivers subclassing MRUnit's MapReduceDriver to make it work with MultipleOutputs here, hope that helps.
MRUnit 1.1.0 has been released in June 2014 (see http://mrunit.apache.org/)
This latest release includes support for MultipleOutputs (see https://issues.apache.org/jira/browse/MRUNIT-13)
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