/*
* 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)));
}
/** Check if next works correctly */
public void testNext() {
// Move down one at a time
// Check if this is being done correctly
iter = list.listIterator();
Object next;
for (int i = 0; i < numElements - 1; i++) {
next = iter.next();
assertTrue(next.equals(i));
assertTrue(iter.hasNext());
}
next = iter.next();
assertTrue(next.equals(numElements - 1));
assertFalse(iter.hasNext());
}
public void testSet() {
// Double the values in the list using set
iter = list.listIterator();
while (iter.hasNext()) {
int next = (Integer) iter.next();
next *= 2;
iter.set(next);
}
// Check if the doubling got done right
assertEquals(list.size(), numElements);
for (int i = 0; i < numElements; i++) assertTrue(list.get(i).equals(2 * i));
}