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import { waitFakeTimer } from '../../../tests/utils';
import { isStyleSupport } from '../styleChecker';
import throttleByAnimationFrame from '../throttleByAnimationFrame';
import toList from '../toList';
describe('Test utils function', () => {
describe('throttle', () => {
beforeAll(() => {
jest.useFakeTimers();
});
afterAll(() => {
jest.useRealTimers();
});
afterEach(() => {
jest.clearAllTimers();
});
it('throttle function should work', async () => {
const callback = jest.fn();
const throttled = throttleByAnimationFrame(callback);
expect(callback).not.toHaveBeenCalled();
throttled();
throttled();
await waitFakeTimer();
expect(callback).toHaveBeenCalled();
expect(callback.mock.calls.length).toBe(1);
});
it('throttle function should be canceled', async () => {
const callback = jest.fn();
const throttled = throttleByAnimationFrame(callback);
throttled();
throttled.cancel();
await waitFakeTimer();
expect(callback).not.toHaveBeenCalled();
});
});
describe('style', () => {
it('isStyleSupport', () => {
expect(isStyleSupport('color')).toBe(true);
expect(isStyleSupport('not-existed')).toBe(false);
});
it('isStyleSupport return false in service side', () => {
const spy = jest
.spyOn(window.document, 'documentElement', 'get')
.mockImplementation(() => undefined as unknown as HTMLElement);
expect(isStyleSupport('color')).toBe(false);
expect(isStyleSupport('not-existed')).toBe(false);
spy.mockRestore();
});
});
describe('toList', () => {
it('toList should work', () => {
expect(toList(123)).toEqual([123]);
expect(toList([123])).toEqual([123]);
expect(toList(null, true)).toEqual([]);
expect(toList(undefined, true)).toEqual([]);
});
});
});
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