@exadel/esl/modules/esl-utils/test/raf.mock.js

Exadel Smart Library (ESL) is the lightweight custom elements library that provide a set of super-flexible components

export class RAFMock {
    constructor() {
        this.handleCounter = 0;
        this.queue = new Map();
    }
    requestAnimationFrame(callback) {
        const handle = this.handleCounter++;
        this.queue.set(handle, callback);
        return handle;
    }
    cancelAnimationFrame(handle) {
        this.queue.delete(handle);
    }
    triggerNextAnimationFrame(time = performance.now()) {
        const nextEntry = this.queue.entries().next().value;
        if (nextEntry === undefined)
            return;
        const [nextHandle, nextCallback] = nextEntry;
        nextCallback(time);
        this.queue.delete(nextHandle);
    }
    triggerAllAnimationFrames(time = performance.now()) {
        while (this.queue.size > 0)
            this.triggerNextAnimationFrame(time);
    }
    reset() {
        this.queue.clear();
        this.handleCounter = 0;
    }
    static applyMock() {
        if (RAFMock.instance)
            return;
        const instance = new RAFMock();
        window.requestAnimationFrame = instance.requestAnimationFrame.bind(instance);
        window.cancelAnimationFrame = instance.cancelAnimationFrame.bind(instance);
        window.rafMockImpl = instance;
    }
    static get instance() {
        return window.rafMockImpl;
    }
}