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queue.ts
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54 lines (46 loc) · 1.43 KB
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import { Queue } from '../queue';
type QueueConstructor = new <T>() => Queue<T>
export function testQueue(Queue: QueueConstructor) {
it("enqueue should add a new element to the queue", () => {
const queue = new Queue<number>();
queue.enqueue(1);
expect(queue.length()).toBe(1);
});
it("isEmpty should return true on empty queue", () => {
const queue = new Queue<number>();
expect(queue.isEmpty()).toBeTruthy();
});
it("isEmpty should return false on not empty queue", () => {
const queue = new Queue<number>();
queue.enqueue(1);
expect(queue.isEmpty()).toBeFalsy();
});
it("front should return the first value", () => {
const queue = new Queue<number>();
queue.enqueue(1);
expect(queue.peek()).toBe(1);
});
it("front should return null when the queue is empty", () => {
const queue = new Queue<number>();
expect(queue.peek()).toBe(null);
});
it("length should return the number of elements in the queue", () => {
const queue = new Queue<number>();
queue.enqueue(1);
queue.enqueue(1);
queue.enqueue(1);
expect(queue.length()).toBe(3);
});
it("dequeue should remove the first element", () => {
const queue = new Queue<number>();
queue.enqueue(1);
queue.enqueue(2);
queue.enqueue(3);
queue.dequeue();
expect(queue.length()).toBe(2);
});
it("dequeue should throw error on empty queue", () => {
const queue = new Queue<number>();
expect(() => queue.dequeue()).toThrow("Queue Underflow");
});
}