merge: Refactor Code and Add test case (#845)

Data-Structures/Queue/test/Queue.test.js

@@ -0,0 +1,48 @@
+import { Queue } from '../Queue'
+
+describe('Queue', () => {
+  it('Check enqueue/dequeue', () => {
+    const queue = new Queue()
+    queue.enqueue(1)
+    queue.enqueue(2)
+    queue.enqueue(8)
+    queue.enqueue(9)
+
+    expect(queue.dequeue()).toBe(1)
+    expect(queue.dequeue()).toBe(2)
+  })
+
+  it('Check length', () => {
+    const queue = new Queue()
+
+    queue.enqueue(1)
+    queue.enqueue(2)
+    queue.enqueue(8)
+    queue.enqueue(9)
+
+    expect(queue.length()).toBe(4)
+  })
+
+  it('Check peek', () => {
+    const queue = new Queue()
+
+    queue.enqueue(1)
+    queue.enqueue(2)
+    queue.enqueue(8)
+    queue.enqueue(9)
+
+    expect(queue.peek()).toBe(1)
+  })
+
+  it('Check empty', () => {
+    const queue = new Queue()
+    expect(queue.empty()).toBeTruthy()
+
+    queue.enqueue(1)
+    queue.enqueue(2)
+    queue.enqueue(8)
+    queue.enqueue(9)
+
+    expect(queue.empty()).toBeFalsy()
+  })
+})