@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);
}
