How do you test code that uses Deque?

import java.util.ArrayDeque;
import java.util.Deque;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

public class DequeTest {

    @Test
    public void testDequeOperations() {
        Deque deque = new ArrayDeque<>();

        // Adding elements
        deque.addFirst(1);
        deque.addLast(2);
        deque.addFirst(0);

        // Assert size is correct
        Assertions.assertEquals(3, deque.size());

        // Check the order of elements
        Assertions.assertEquals(0, deque.peekFirst());
        Assertions.assertEquals(2, deque.peekLast());

        // Remove elements
        Assertions.assertEquals(0, deque.removeFirst());
        Assertions.assertEquals(2, deque.removeLast());

        // Final size
        Assertions.assertEquals(1, deque.size());
    }
}