48 lines
1.5 KiB
JavaScript
48 lines
1.5 KiB
JavaScript
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import gapiLoader from '~/create_cluster/gke_cluster/gapi_loader';
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describe('gapiLoader', () => {
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// A mock for document.head.appendChild to intercept the script tag injection.
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let mockDOMHeadAppendChild;
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beforeEach(() => {
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mockDOMHeadAppendChild = jest.spyOn(document.head, 'appendChild');
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});
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afterEach(() => {
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mockDOMHeadAppendChild.mockRestore();
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delete window.gapi;
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delete window.gapiPromise;
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delete window.onGapiLoad;
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});
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it('returns a promise', () => {
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expect(gapiLoader()).toBeInstanceOf(Promise);
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});
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it('returns the same promise when already loading', () => {
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const first = gapiLoader();
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const second = gapiLoader();
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expect(first).toBe(second);
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});
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it('resolves the promise when the script loads correctly', async () => {
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mockDOMHeadAppendChild.mockImplementationOnce((script) => {
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script.removeAttribute('src');
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script.appendChild(
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document.createTextNode(`window.gapi = 'hello gapi'; window.onGapiLoad()`),
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);
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document.head.appendChild(script);
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});
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await expect(gapiLoader()).resolves.toBe('hello gapi');
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expect(mockDOMHeadAppendChild).toHaveBeenCalled();
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});
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it('rejects the promise when the script fails loading', async () => {
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mockDOMHeadAppendChild.mockImplementationOnce((script) => {
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script.onerror(new Error('hello error'));
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});
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await expect(gapiLoader()).rejects.toThrow('hello error');
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expect(mockDOMHeadAppendChild).toHaveBeenCalled();
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});
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});
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