javascript-algorithms/src/data-structures/queue/__test__/Queue.test.js at c8bfe9ffaa40d0250871ac2e3517633c3582c1a3 · moonreplace/javascript-algorithms · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
import Queue from '../Queue';

describe('Queue', () => {
  it('should create empty queue', () => {
    const queue = new Queue();
    expect(queue).not.toBeNull();
    expect(queue.linkedList).not.toBeNull();
  });

  it('should add data to queue', () => {
    const queue = new Queue();

    queue.add(1);
    queue.add(2);

    expect(queue.linkedList.toString()).toBe('1,2');
  });

  it('should peek data from queue', () => {
    const queue = new Queue();

    expect(queue.peek()).toBeNull();

    queue.add(1);
    queue.add(2);

    expect(queue.peek()).toBe(2);
    expect(queue.peek()).toBe(2);
  });

  it('should check if queue is empty', () => {
    const queue = new Queue();

    expect(queue.isEmpty()).toBeTruthy();

    queue.add(1);

    expect(queue.isEmpty()).toBeFalsy();
  });

  it('should remove from empty', () => {
    const queue = new Queue();

    queue.add(1);
    queue.add(2);

    expect(queue.remove()).toBe(2);
    expect(queue.remove()).toBe(1);
    expect(queue.isEmpty()).toBeTruthy();
  });
});