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observe.spec.ts
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observe.spec.ts
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import { config } from '../src/config';
import { WP } from '../src/constants';
import { initLayoutShift } from '../src/cumulativeLayoutShift';
import { initFirstInputDelay } from '../src/firstInput';
import * as log from '../src/log';
import {
disconnectPerfObserversHidden,
initPerformanceObserver,
} from '../src/observe';
import { perfObservers } from '../src/observeInstances';
import * as paint from '../src/paint';
import * as po from '../src/performanceObserver';
import mock from './_mock';
describe('observe', () => {
let spy: jest.SpyInstance;
beforeEach(() => {
(WP as any) = mock.performance();
(window as any).PerformanceObserver = mock.PerformanceObserver;
config.isResourceTiming = false;
jest.spyOn(paint, 'initFirstPaint').mockImplementation(() => {});
jest
.spyOn(paint, 'initLargestContentfulPaint')
.mockImplementation(() => {});
});
afterEach(() => {
if (spy) {
spy.mockReset();
spy.mockRestore();
}
});
describe('.initPerformanceObserver()', () => {
it('should call po four times', () => {
spy = jest.spyOn(po, 'po');
initPerformanceObserver();
expect(spy.mock.calls.length).toEqual(4);
expect(spy).toHaveBeenCalledWith('paint', paint.initFirstPaint);
expect(spy).toHaveBeenCalledWith('first-input', initFirstInputDelay);
expect(spy).toHaveBeenCalledWith(
'largest-contentful-paint',
paint.initLargestContentfulPaint,
);
expect(spy).toHaveBeenCalledWith('layout-shift', initLayoutShift);
});
});
describe('.disconnectPerfObserversHidden()', () => {
it('should call logMetric', () => {
perfObservers[2] = { disconnect: jest.fn() };
perfObservers[3] = { disconnect: jest.fn(), takeRecords: jest.fn() };
perfObservers[4] = { disconnect: jest.fn() };
spy = jest.spyOn(log, 'logMetric');
disconnectPerfObserversHidden();
expect(spy.mock.calls.length).toEqual(3);
});
});
});