@Test public void testFront() { System.out.println("front"); // [].front() -> -1 ADTQueue instance = ADTQueue.createQ(); int expResult = -1; int result = instance.front(); assertEquals(expResult, result); // [].front() -> -1 ADTQueue instance2 = ADTQueue.createQ().enqueue(1).enqueue(2).enqueue(3); int expResult2 = 1; int result2 = instance2.front(); assertEquals(expResult2, result2); }