63 lines
1.7 KiB
JavaScript
63 lines
1.7 KiB
JavaScript
import TappablePromise from '~/lib/utils/tappable_promise';
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describe('TappablePromise', () => {
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it('allows a promise to have a progress indicator', () => {
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const pseudoProgress = [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1];
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const progressCallback = jest.fn();
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const promise = new TappablePromise((tap, resolve) => {
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pseudoProgress.forEach(tap);
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resolve('done');
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return 'returned value';
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});
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return promise
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.tap(progressCallback)
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.then((val) => {
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expect(val).toBe('done');
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expect(val).not.toBe('returned value');
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expect(progressCallback).toHaveBeenCalledTimes(pseudoProgress.length);
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pseudoProgress.forEach((progress, index) => {
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expect(progressCallback).toHaveBeenNthCalledWith(index + 1, progress);
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});
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})
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.catch(() => {});
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});
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it('resolves with the value returned by the callback', () => {
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const promise = new TappablePromise((tap) => {
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tap(0.5);
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return 'test';
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});
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return promise
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.tap((progress) => {
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expect(progress).toBe(0.5);
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})
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.then((value) => {
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expect(value).toBe('test');
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});
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});
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it('allows a promise to be rejected', () => {
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const promise = new TappablePromise((tap, resolve, reject) => {
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reject(new Error('test error'));
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});
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return promise.catch((e) => {
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expect(e.message).toBe('test error');
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});
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});
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it('rejects the promise if the callback throws an error', () => {
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const promise = new TappablePromise(() => {
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throw new Error('test error');
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});
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return promise.catch((e) => {
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expect(e.message).toBe('test error');
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});
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});
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});
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