@Test
public void testDIFF() throws Exception {
// Test it in the case with two bags.
BagFactory bf = BagFactory.getInstance();
TupleFactory tf = TupleFactory.getInstance();
DataBag b1 = bf.newDefaultBag();
DataBag b2 = bf.newDefaultBag();
for (int i = 0; i < 10; i++) b1.add(tf.newTuple(new Integer(i)));
for (int i = 0; i < 10; i += 2) b2.add(tf.newTuple(new Integer(i)));
Tuple t = tf.newTuple(2);
t.set(0, b1);
t.set(1, b2);
DIFF d = new DIFF();
DataBag result = d.exec(t);
assertEquals(5, result.size());
Iterator<Tuple> i = result.iterator();
int[] values = new int[5];
for (int j = 0; j < 5; j++) values[j] = (Integer)i.next().get(0);
Arrays.sort(values);
for (int j = 1; j < 10; j += 2) assertEquals(j, values[j/2]);
// Test it in the case of two objects that are equals
t = tf.newTuple(2);
t.set(0, new Integer(1));
t.set(1, new Integer(1));
result = d.exec(t);
assertEquals(0, result.size());
// Test it in the case of two objects that are not equal
t = tf.newTuple(2);
t.set(0, new Integer(1));
t.set(1, new Integer(2));
result = d.exec(t);
assertEquals(2, result.size());
}