Write three different JUnit tests:

@Test public void testAdd() { System.out.println("add"); Object element = null; Playlist instance = new Playlist(); boolean expResult = false; boolean result = instance.add(element); assertEquals(expResult, result); // TODO review the generated test code and remove the default call to fail. fail("The test case is a prototype."); }

/** * Test of remove method, of class Playlist. */ @Test public void testRemove() { System.out.println("remove"); Object element = null; Playlist instance = new Playlist(); boolean expResult = false; boolean result = instance.remove(element); assertEquals(expResult, result); // TODO review the generated test code and remove the default call to fail. fail("The test case is a prototype."); }

@Test public void testPlay() { System.out.println("play"); int index = 0; Playlist instance = new Playlist(); Object expResult = null; Object result = instance.play(index); assertEquals(expResult, result); // TODO review the generated test code and remove the default call to fail. fail("The test case is a prototype."); }