### Question:
BloomMapper extends Mapper<Text,Text,Text,NullWritable> { @Override protected void map(Text key, Text value, Context context) throws IOException, InterruptedException { context.write(key, NullWritable.get()); }    }### Answer:
@Test public void tryIt() throws IOException, InterruptedException { mapper.map(new Text("love is"),new Text("going to save us"),context); verify(context).write(new Text("love is"), NullWritable.get()); }