.withInput(new Text("B2"), new LongWritable(1L))
.withInput(new Text("C1"), new LongWritable(1L))
.withOutput(new Text("A2"), new LongWritable(2L))
.withOutput(new Text("B2"), new LongWritable(2L))
.withOutput(new Text("C1"), new LongWritable(1L))
.withKeyGroupingComparator(new FirstCharComparator()).runTest(false);
}