context.write(new VarLongWritable(12L), new EntityPrefWritable(34L, 1.0f));
context.write(new VarLongWritable(56L), new EntityPrefWritable(78L, 2.0f));
EasyMock.replay(context);
ToItemPrefsMapper mapper = new ToItemPrefsMapper();
mapper.map(new LongWritable(123L), new Text("12,34,1"), context);
mapper.map(new LongWritable(456L), new Text("56,78,2"), context);
EasyMock.verify(context);
}