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Original file line number | Diff line number | Diff line change |
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import { lazyDocumentReady, lazyLoad } from './lazyLoad'; | ||
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describe('lazyLoad', () => { | ||
it('should return call initFunction and returns the value', async () => { | ||
const initFunction = jest.fn().mockReturnValue('test'); | ||
const promiseToAwait = jest.fn().mockResolvedValue(undefined); | ||
const result = await lazyLoad(promiseToAwait, initFunction); | ||
expect(result).toEqual('test'); | ||
expect(initFunction).toHaveBeenCalled(); | ||
}); | ||
}); | ||
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describe('lazyDocumentReady', () => { | ||
let mockInitialiseFunction: jest.Mock<any, any>; | ||
let originalDocument: Document | undefined; | ||
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beforeEach(() => { | ||
mockInitialiseFunction = jest.fn(); | ||
originalDocument = window.document; | ||
const mockDocument = { | ||
...window.document, | ||
readyState: 'complete', | ||
}; | ||
(window as any).document = mockDocument; | ||
}); | ||
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afterEach(() => { | ||
// Restore the original document.readyState value after each test | ||
(window as any).document = originalDocument; | ||
}); | ||
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it('should call the initialiseFunction when the document is already ready', async () => { | ||
jest.spyOn(window.document, 'readyState', 'get').mockReturnValue('complete'); | ||
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await lazyDocumentReady(mockInitialiseFunction); | ||
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expect(mockInitialiseFunction).toHaveBeenCalledTimes(1); | ||
}); | ||
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it('should call the initialiseFunction when the document becomes ready', async () => { | ||
jest.spyOn(window.document, 'readyState', 'get').mockReturnValue('loading'); | ||
const mockAddEventListener = jest.spyOn(window.document, 'addEventListener'); | ||
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const lazyDocumentPromise = lazyDocumentReady(mockInitialiseFunction); | ||
expect(mockInitialiseFunction).toHaveBeenCalledTimes(0); | ||
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jest.spyOn(window.document, 'readyState', 'get').mockReturnValue('complete'); | ||
const mockEvent = new Event('readystatechange'); | ||
window.document.dispatchEvent(mockEvent); | ||
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await lazyDocumentPromise; | ||
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expect(mockAddEventListener).toHaveBeenCalledWith('readystatechange', expect.any(Function)); | ||
expect(mockInitialiseFunction).toHaveBeenCalledTimes(1); | ||
}); | ||
}); |
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Original file line number | Diff line number | Diff line change |
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export const lazyLoad = <T, Y = void>( | ||
promiseToAwait: () => Promise<Y>, | ||
initialiseFunction: (arg: Y) => Promise<T> | T, | ||
): Promise<T> => promiseToAwait().then(initialiseFunction); | ||
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export const lazyDocumentReady = <T>(initialiseFunction: () => Promise<T> | T): Promise<T> => { | ||
const documentReadyPromise = () => new Promise<void>((resolve) => { | ||
if (window.document.readyState === 'complete') { | ||
resolve(); | ||
} else { | ||
const onReadyStateChange = () => { | ||
if (window.document.readyState === 'complete') { | ||
resolve(); | ||
window.document.removeEventListener('readystatechange', onReadyStateChange); | ||
} | ||
}; | ||
window.document.addEventListener('readystatechange', onReadyStateChange); | ||
} | ||
}); | ||
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return lazyLoad(documentReadyPromise, initialiseFunction); | ||
}; |