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circular_queue.test.ts
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65 lines (48 loc) · 1.57 KB
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import { CircularQueue } from "../circular_queue";
describe("Circular Queue", () => {
let queue: CircularQueue<number>;
beforeEach(() => {
queue = new CircularQueue(5);
});
it("should enqueue an element", () => {
queue.enqueue(1);
expect(queue.peek()).toBe(1);
});
it("should throw an error on enqueue when queue is full", () => {
queue.enqueue(1);
queue.enqueue(2);
queue.enqueue(3);
queue.enqueue(4);
queue.enqueue(5);
expect(() => queue.enqueue(6)).toThrowError("Queue is full");
});
it("should dequeue an element", () => {
queue.enqueue(1);
queue.enqueue(2);
expect(queue.dequeue()).toBe(1);
});
it("should throw an error on dequeue when queue is empty", () => {
expect(() => queue.dequeue()).toThrowError("Queue is empty");
});
it("should peek an element", () => {
queue.enqueue(1);
queue.enqueue(2);
expect(queue.peek()).toBe(1);
});
it("should return null on peek when queue is empty", () => {
expect(queue.peek()).toBeNull();
});
it("should return true on isEmpty when queue is empty", () => {
expect(queue.isEmpty()).toBeTruthy();
});
it("should return false on isEmpty when queue is not empty", () => {
queue.enqueue(1);
expect(queue.isEmpty()).toBeFalsy();
});
it("should return the correct length", () => {
queue.enqueue(1);
queue.enqueue(2);
queue.enqueue(3);
expect(queue.length()).toBe(3);
});
});