70 lines
1.5 KiB
JavaScript
70 lines
1.5 KiB
JavaScript
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import { RenderBalancer } from '~/streaming/render_balancer';
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const HIGH_FRAME_TIME = 100;
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const LOW_FRAME_TIME = 10;
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describe('renderBalancer', () => {
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let frameTime = 0;
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let frameTimeDelta = 0;
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let decrease;
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let increase;
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const createBalancer = () => {
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decrease = jest.fn();
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increase = jest.fn();
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return new RenderBalancer({
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highFrameTime: HIGH_FRAME_TIME,
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lowFrameTime: LOW_FRAME_TIME,
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increase,
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decrease,
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});
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};
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const renderTimes = (times) => {
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const balancer = createBalancer();
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return new Promise((resolve) => {
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let counter = 0;
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balancer.render(() => {
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if (counter === times) {
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resolve(counter);
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return false;
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}
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counter += 1;
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return true;
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});
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});
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};
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beforeEach(() => {
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jest.spyOn(window, 'requestAnimationFrame').mockImplementation((cb) => {
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frameTime += frameTimeDelta;
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cb(frameTime);
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});
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});
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afterEach(() => {
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window.requestAnimationFrame.mockRestore();
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frameTime = 0;
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frameTimeDelta = 0;
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});
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it('renders in a loop', async () => {
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const count = await renderTimes(5);
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expect(count).toBe(5);
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});
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it('calls decrease', async () => {
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frameTimeDelta = 200;
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await renderTimes(5);
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expect(decrease).toHaveBeenCalled();
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expect(increase).not.toHaveBeenCalled();
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});
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it('calls increase', async () => {
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frameTimeDelta = 1;
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await renderTimes(5);
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expect(increase).toHaveBeenCalled();
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expect(decrease).not.toHaveBeenCalled();
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});
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});
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