textBag.add(tf.newTupleNoCopy(Arrays.asList(JOHN_SENTENCE)));
textBag.add(tf.newTupleNoCopy(Arrays.asList(JOHN_SENTENCE)));
textBag.add(tf.newTupleNoCopy(Arrays.asList(JOHN_SENTENCE)));
// all bags
Tuple input = tf.newTupleNoCopy(Arrays.asList(textBag));
String merged = aggregator.exec(input);
String expected = StringUtils.join(
Arrays.asList(JOHN_SENTENCE, JOHN_SENTENCE), " ");
expected = "\"" + expected + "\"";
assertEquals(expected, merged);