### Question:
StreamingBuilder implements Builder<Streaming> { public StreamingBuilder withRecordReaderMapping(final String recordReaderMapping) { this.recordReaderMappings.add(recordReaderMapping); return this; } StreamingBuilder(); StreamingBuilder withMapper(final String mapper); StreamingBuilder withReducer(final String reducer); StreamingBuilder withRecordReader(final String recordReader); StreamingBuilder withRecordReaderMapping(final String recordReaderMapping); StreamingBuilder withEnv(final String env); @Override Streaming build();  }### Answer:
@Test public void testWithRecordReaderMapping() { final String mapping1 = "mapping1"; final String mapping2 = "mapping2"; final StreamingBuilder builder = new StreamingBuilder(); builder.withRecordReaderMapping(mapping1) .withRecordReaderMapping(mapping2); final Streaming streaming = builder.build(); assertEquals(Arrays.asList(mapping1, mapping2), streaming.getRecordReaderMappings()); }