48 lines
1.5 KiB
JavaScript
48 lines
1.5 KiB
JavaScript
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();
|
|
});
|
|
});
|