2016-06-23 12:47:54 -04:00
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/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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2016-04-28 20:50:03 -04:00
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import {AsyncPipe} from '@angular/common';
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2017-03-01 13:28:52 -05:00
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import {EventEmitter, WrappedValue} from '@angular/core';
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import {AsyncTestCompleter, beforeEach, describe, expect, inject, it} from '@angular/core/testing/src/testing_internal';
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import {getDOM} from '@angular/platform-browser/src/dom/dom_adapter';
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import {browserDetection} from '@angular/platform-browser/testing/src/browser_util';
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2015-08-04 14:55:21 -04:00
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2016-08-02 18:53:34 -04:00
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import {SpyChangeDetectorRef} from '../spies';
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2017-12-16 17:42:55 -05:00
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{
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describe('AsyncPipe', () => {
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describe('Observable', () => {
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let emitter: EventEmitter<any>;
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let pipe: AsyncPipe;
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let ref: any;
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const message = {};
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beforeEach(() => {
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emitter = new EventEmitter();
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ref = new SpyChangeDetectorRef();
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pipe = new AsyncPipe(ref);
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});
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2016-06-08 19:38:52 -04:00
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describe('transform', () => {
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it('should return null when subscribing to an observable',
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() => { expect(pipe.transform(emitter)).toBe(null); });
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it('should return the latest available value wrapped',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
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pipe.transform(emitter);
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emitter.emit(message);
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setTimeout(() => {
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expect(pipe.transform(emitter)).toEqual(new WrappedValue(message));
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async.done();
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}, 0);
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}));
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2016-05-25 20:16:50 -04:00
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it('should return same value when nothing has changed since the last call',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
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pipe.transform(emitter);
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emitter.emit(message);
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setTimeout(() => {
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pipe.transform(emitter);
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expect(pipe.transform(emitter)).toBe(message);
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async.done();
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}, 0);
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}));
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it('should dispose of the existing subscription when subscribing to a new observable',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
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pipe.transform(emitter);
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const newEmitter = new EventEmitter();
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expect(pipe.transform(newEmitter)).toBe(null);
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emitter.emit(message);
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// this should not affect the pipe
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setTimeout(() => {
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expect(pipe.transform(newEmitter)).toBe(null);
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async.done();
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}, 0);
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}));
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it('should request a change detection check upon receiving a new value',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
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pipe.transform(emitter);
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emitter.emit(message);
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setTimeout(() => {
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expect(ref.spy('markForCheck')).toHaveBeenCalled();
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async.done();
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}, 10);
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}));
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});
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describe('ngOnDestroy', () => {
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it('should do nothing when no subscription',
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() => { expect(() => pipe.ngOnDestroy()).not.toThrow(); });
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it('should dispose of the existing subscription',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
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pipe.transform(emitter);
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pipe.ngOnDestroy();
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emitter.emit(message);
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setTimeout(() => {
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expect(pipe.transform(emitter)).toBe(null);
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async.done();
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}, 0);
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}));
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});
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});
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describe('Promise', () => {
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const message = new Object();
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let pipe: AsyncPipe;
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let resolve: (result: any) => void;
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let reject: (error: any) => void;
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let promise: Promise<any>;
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let ref: SpyChangeDetectorRef;
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// adds longer timers for passing tests in IE
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const timer = (getDOM() && browserDetection.isIE) ? 50 : 10;
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beforeEach(() => {
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promise = new Promise((res, rej) => {
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resolve = res;
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reject = rej;
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});
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ref = new SpyChangeDetectorRef();
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pipe = new AsyncPipe(<any>ref);
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});
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2016-06-08 19:38:52 -04:00
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describe('transform', () => {
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it('should return null when subscribing to a promise',
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() => { expect(pipe.transform(promise)).toBe(null); });
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2016-06-08 19:38:52 -04:00
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it('should return the latest available value',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
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pipe.transform(promise);
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resolve(message);
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setTimeout(() => {
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expect(pipe.transform(promise)).toEqual(new WrappedValue(message));
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async.done();
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}, timer);
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}));
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it('should return unwrapped value when nothing has changed since the last call',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
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pipe.transform(promise);
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resolve(message);
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2016-08-02 18:53:34 -04:00
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setTimeout(() => {
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pipe.transform(promise);
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expect(pipe.transform(promise)).toBe(message);
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async.done();
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}, timer);
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}));
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2016-06-08 19:38:52 -04:00
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it('should dispose of the existing subscription when subscribing to a new promise',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
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pipe.transform(promise);
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promise = new Promise<any>(() => {});
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expect(pipe.transform(promise)).toBe(null);
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// this should not affect the pipe, so it should return WrappedValue
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resolve(message);
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setTimeout(() => {
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expect(pipe.transform(promise)).toBe(null);
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async.done();
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}, timer);
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}));
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2016-06-08 19:38:52 -04:00
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it('should request a change detection check upon receiving a new value',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
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const markForCheck = ref.spy('markForCheck');
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pipe.transform(promise);
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resolve(message);
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2016-08-02 18:53:34 -04:00
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setTimeout(() => {
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2016-02-25 17:24:17 -05:00
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expect(markForCheck).toHaveBeenCalled();
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async.done();
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}, timer);
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}));
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2016-06-08 19:38:52 -04:00
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describe('ngOnDestroy', () => {
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it('should do nothing when no source',
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() => { expect(() => pipe.ngOnDestroy()).not.toThrow(); });
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2015-08-04 14:55:21 -04:00
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2016-06-08 19:38:52 -04:00
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it('should dispose of the existing source',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
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pipe.transform(promise);
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expect(pipe.transform(promise)).toBe(null);
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resolve(message);
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2016-08-02 18:53:34 -04:00
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setTimeout(() => {
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expect(pipe.transform(promise)).toEqual(new WrappedValue(message));
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pipe.ngOnDestroy();
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expect(pipe.transform(promise)).toBe(null);
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async.done();
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}, timer);
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}));
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});
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});
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});
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describe('null', () => {
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it('should return null when given null', () => {
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const pipe = new AsyncPipe(null as any);
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expect(pipe.transform(null)).toEqual(null);
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});
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});
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describe('other types', () => {
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it('should throw when given an invalid object', () => {
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const pipe = new AsyncPipe(null as any);
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expect(() => pipe.transform(<any>'some bogus object')).toThrowError();
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});
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});
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});
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}
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