/** Check if previous is working correctly. */
public void testPrevious() {
iter = list.listIterator(numElements);
Object prev;
for (int i = 0; i < numElements - 1; i++) {
prev = iter.previous();
assertTrue(prev.equals(numElements - i - 1));
assertTrue(iter.hasPrevious());
}
prev = iter.previous();
assertTrue(prev.equals(0));
assertFalse(iter.hasPrevious());
}
/*
* Do the Samba! Perform a random sequence of next and previous
* and check if you are at the correct point in the list
*/
public void testSamba() {
Random random = new Random();
final int sambaSteps = 1;
iter = list.listIterator(numElements / 2); // Position roughly in the middle
int pos = numElements / 2;
for (int i = 0; i < sambaSteps; i++) {
boolean next = random.nextBoolean();
// Randomly jump ahead or back
// pos keeps track of where you should be
if (next && iter.hasNext()) {
iter.next();
pos = pos + 1;
} else if (!next && iter.hasPrevious()) {
iter.previous();
pos = pos - 1;
}
}
// Check to see if you are where you ought to be
assertTrue((pos == numElements) || (iter.next().equals(pos)));
}