### Question:
BridgeOutputBuilder { public LinkedList<Writable> makeOutput(List<OneField> recFields) throws BadRecordException { if (output == null && context.getOutputFormat() == OutputFormat.GPDBWritable) { makeGPDBWritableOutput(); } outputList.clear(); fillOutputRecord(recFields); return outputList; } BridgeOutputBuilder(RequestContext context); Writable getErrorOutput(Exception ex); LinkedList<Writable> makeOutput(List<OneField> recFields); LinkedList<Writable> makeVectorizedOutput(List<List<OneField>> recordsBatch); Writable getPartialLine();  }### Answer:
@Test public void testCSVSerialization() throws Exception { RequestContext context = new RequestContext(); addColumn(context, 0, DataType.INTEGER, "col0"); addColumn(context, 1, DataType.FLOAT8, "col1"); addColumn(context, 2, DataType.REAL, "col2"); addColumn(context, 3, DataType.BIGINT, "col3"); addColumn(context, 4, DataType.SMALLINT, "col4"); addColumn(context, 5, DataType.BOOLEAN, "col5"); addColumn(context, 6, DataType.BYTEA, "col6"); addColumn(context, 7, DataType.VARCHAR, "col7"); addColumn(context, 8, DataType.BPCHAR, "col8"); addColumn(context, 9, DataType.TEXT, "col9"); addColumn(context, 10, DataType.NUMERIC, "col10"); addColumn(context, 11, DataType.TIMESTAMP, "col11"); addColumn(context, 12, DataType.DATE, "col12"); addColumn(context, 13, DataType.VARCHAR, "col13"); BridgeOutputBuilder builder = makeBuilder(context); List<OneField> recFields = Arrays.asList( new OneField(DataType.INTEGER.getOID(), 0), new OneField(DataType.FLOAT8.getOID(), (double) 0), new OneField(DataType.REAL.getOID(), (float) 0), new OneField(DataType.BIGINT.getOID(), (long) 0), new OneField(DataType.SMALLINT.getOID(), (short) 0), new OneField(DataType.BOOLEAN.getOID(), true), new OneField(DataType.BYTEA.getOID(), new byte[]{0}), new OneField(DataType.VARCHAR.getOID(), "value"), new OneField(DataType.BPCHAR.getOID(), "value"), new OneField(DataType.TEXT.getOID(), "va\"lue"), new OneField(DataType.NUMERIC.getOID(), "0"), new OneField(DataType.TIMESTAMP.getOID(), new Timestamp(0)), new OneField(DataType.DATE.getOID(), new Date(1)), new OneField(DataType.VARCHAR.getOID(), null) ); List<Writable> outputQueue = builder.makeOutput(recFields); assertNotNull(outputQueue); assertEquals(1, outputQueue.size()); String datetime = new Timestamp(0).toLocalDateTime().format(GreenplumDateTime.DATETIME_FORMATTER); String date = new Date(1).toString(); outputQueue.get(0).write(dos); assertEquals("0,0.0,0.0,0,0,true,\\x00,value,value,\"va\"\"lue\",0," + datetime + "," + date + ",\n", new String(dos.getOutput(), "UTF8")); }