@Test
public void dequeueTest() {
// When the stack empty...
try {
queue.dequeue();
fail("A IllegalStateException should be thrown.");
} catch (IllegalStateException e) {
}
// Adding some elements...
queue.enqueue(1);
queue.enqueue(2);
queue.enqueue(3);
assertEquals(1, queue.dequeue());
// Checking that this method removes something.
assertEquals(2, queue.dequeue());
}
@Test
public void sizeTest() {
// When the stack empty...
assertEquals(0, queue.size());
// Adding some elements...
queue.enqueue(1);
assertEquals(1, queue.size());
// Testing it backwards...
queue.dequeue();
assertEquals(0, queue.size());
}
@Test
public void isEmptyTest() {
// When the stack empty...
assertEquals(true, queue.isEmpty());
// Adding some elements...
queue.enqueue(1);
assertEquals(false, queue.isEmpty());
// Testing it backwards...
queue.dequeue();
assertEquals(true, queue.isEmpty());
}