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