angular-cn/packages/zone.js/test/rxjs/rxjs.retry.spec.ts

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1.3 KiB
TypeScript

/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {Observable, of, throwError, timer} from 'rxjs';
import {catchError, finalize, mergeMap, retryWhen} from 'rxjs/operators';
describe('retryWhen', () => {
let log: any[];
const genericRetryStrategy = (finalizer: () => void) => (attempts: Observable<any>) =>
attempts.pipe(
mergeMap((error, i) => {
const retryAttempt = i + 1;
if (retryAttempt > 3) {
return throwError(error);
}
log.push(error);
return timer(retryAttempt * 1);
}),
finalize(() => finalizer()));
const errorGenerator = () => {
return throwError(new Error('error emit'));
};
beforeEach(() => {
log = [];
});
it('should retry max 3 times',
(done: DoneFn) => {errorGenerator()
.pipe(
retryWhen(genericRetryStrategy(() => {
expect(log.length).toBe(3);
done();
})),
catchError(error => of(error)))
.subscribe()});
});