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Unit Test for MapReduce

mrunit: helps developers unit test map reduce jobs -> Good Tutorial

PowerMock and Mockito: can test and mock static and private methods -> Good Tutorial

test a mapper -> using MRUnit’s MapDriver 

reducer -> ReduceDriver
map/reduce pair and a combiner ->  MapReduceDriver
workflow of map/reduce jobs ->  PipelineMapReduceDriver
partitioners -> MRUnit doesn't have a test driver for it


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