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