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