java linked list queue test

So here are some of the methods that i want to test:

public class LQueueTest {

LQueue q;

public void setup()
{
    q = new LQueue();
}


@Test
public void testIsEmpty() {
    assertTrue(q.isEmpty());


}

@Test
public void testIsEmptyFalse() {
    q.enqueue(5);
    assertTrue(!q.isEmpty());
}

@Test
public void testSize() {

// not sure how }

@Test
public void testEnqueue() {
    q.enqueue(5);
}

@Test(expected = QueueException.class)  
public void testEmptyDequeue() {  
    q.dequeue();
}

@Test
public void testDequeue() {
    q.dequeue();
}

public void testOneDequeue() {
    q.enqueue(5);
    q.dequeue();
    assertTrue(q.isEmpty());

} }

so i have try to implement a simple method to test and it never work , why is the code incorrect?