import junit.framework.TestCase;
import java.util.*;

public class SorterTest extends TestCase {

    
    class IntComparator implements Comparator {

        public int compare(Object o1, Object o2) {

            int i1 = ((Integer) o1).intValue();
            int i2 = ((Integer) o2).intValue();
            return i1-i2;
        }

    }

    public void testSortEmptyList() {
        List list = new ArrayList();
        Collections.sort(list, new IntComparator());
        assertEquals(0, list.size());        
    }
    
    public void testSort2ElementList() {
        List list = new ArrayList();
        list.add(new Integer(2));
        list.add(new Integer(-2));
        Collections.sort(list, new IntComparator());
        assertEquals(2, ((Integer) list.get(1)).intValue());        
        assertEquals(-2, ((Integer) list.get(0)).intValue());
    }
    
    
    
}