angular-cn/packages/common/test/pipes/async_pipe_spec.ts

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/**
* @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 {AsyncPipe, ɵgetDOM as getDOM} from '@angular/common';
import {EventEmitter, WrappedValue} from '@angular/core';
import {AsyncTestCompleter, beforeEach, describe, expect, inject, it} from '@angular/core/testing/src/testing_internal';
import {browserDetection} from '@angular/platform-browser/testing/src/browser_util';
import {SpyChangeDetectorRef} from '../spies';
{
describe('AsyncPipe', () => {
describe('Observable', () => {
let emitter: EventEmitter<any>;
let pipe: AsyncPipe;
let ref: any;
const message = {};
beforeEach(() => {
emitter = new EventEmitter();
ref = new SpyChangeDetectorRef();
pipe = new AsyncPipe(ref);
});
describe('transform', () => {
it('should return null when subscribing to an observable',
() => { expect(pipe.transform(emitter)).toBe(null); });
it('should return the latest available value wrapped',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
pipe.transform(emitter);
emitter.emit(message);
setTimeout(() => {
expect(pipe.transform(emitter)).toEqual(new WrappedValue(message));
async.done();
}, 0);
}));
it('should return same value when nothing has changed since the last call',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
pipe.transform(emitter);
emitter.emit(message);
setTimeout(() => {
pipe.transform(emitter);
expect(pipe.transform(emitter)).toBe(message);
async.done();
}, 0);
}));
it('should dispose of the existing subscription when subscribing to a new observable',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
pipe.transform(emitter);
const newEmitter = new EventEmitter();
expect(pipe.transform(newEmitter)).toBe(null);
emitter.emit(message);
// this should not affect the pipe
setTimeout(() => {
expect(pipe.transform(newEmitter)).toBe(null);
async.done();
}, 0);
}));
it('should request a change detection check upon receiving a new value',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
pipe.transform(emitter);
emitter.emit(message);
setTimeout(() => {
expect(ref.spy('markForCheck')).toHaveBeenCalled();
async.done();
}, 10);
}));
it('should return unwrapped value for unchanged NaN', () => {
const emitter = new EventEmitter<any>();
emitter.emit(null);
pipe.transform(emitter);
emitter.next(NaN);
const firstResult = pipe.transform(emitter);
const secondResult = pipe.transform(emitter);
expect(firstResult instanceof WrappedValue).toBe(true);
expect((firstResult as WrappedValue).wrapped).toBeNaN();
expect(secondResult).toBeNaN();
});
});
describe('ngOnDestroy', () => {
it('should do nothing when no subscription',
() => { expect(() => pipe.ngOnDestroy()).not.toThrow(); });
it('should dispose of the existing subscription',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
pipe.transform(emitter);
pipe.ngOnDestroy();
emitter.emit(message);
setTimeout(() => {
expect(pipe.transform(emitter)).toBe(null);
async.done();
}, 0);
}));
});
});
describe('Promise', () => {
const message = {};
let pipe: AsyncPipe;
let resolve: (result: any) => void;
let reject: (error: any) => void;
let promise: Promise<any>;
let ref: SpyChangeDetectorRef;
// adds longer timers for passing tests in IE
const timer = (getDOM() && browserDetection.isIE) ? 50 : 10;
beforeEach(() => {
promise = new Promise((res, rej) => {
resolve = res;
reject = rej;
});
ref = new SpyChangeDetectorRef();
pipe = new AsyncPipe(<any>ref);
});
describe('transform', () => {
it('should return null when subscribing to a promise',
() => { expect(pipe.transform(promise)).toBe(null); });
it('should return the latest available value',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
pipe.transform(promise);
resolve(message);
setTimeout(() => {
expect(pipe.transform(promise)).toEqual(new WrappedValue(message));
async.done();
}, timer);
}));
it('should return unwrapped value when nothing has changed since the last call',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
pipe.transform(promise);
resolve(message);
setTimeout(() => {
pipe.transform(promise);
expect(pipe.transform(promise)).toBe(message);
async.done();
}, timer);
}));
it('should dispose of the existing subscription when subscribing to a new promise',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
pipe.transform(promise);
promise = new Promise<any>(() => {});
expect(pipe.transform(promise)).toBe(null);
// this should not affect the pipe, so it should return WrappedValue
resolve(message);
setTimeout(() => {
expect(pipe.transform(promise)).toBe(null);
async.done();
}, timer);
}));
it('should request a change detection check upon receiving a new value',
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
const markForCheck = ref.spy('markForCheck');
pipe.transform(promise);
resolve(message);
setTimeout(() => {
expect(markForCheck).toHaveBeenCalled();
async.done();
}, timer);
}));
describe('ngOnDestroy', () => {
it('should do nothing when no source',
() => { expect(() => pipe.ngOnDestroy()).not.toThrow(); });
it('should dispose of the existing source',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
pipe.transform(promise);
expect(pipe.transform(promise)).toBe(null);
resolve(message);
setTimeout(() => {
expect(pipe.transform(promise)).toEqual(new WrappedValue(message));
pipe.ngOnDestroy();
expect(pipe.transform(promise)).toBe(null);
async.done();
}, timer);
}));
});
});
});
describe('null', () => {
it('should return null when given null', () => {
const pipe = new AsyncPipe(null as any);
expect(pipe.transform(null)).toEqual(null);
});
});
describe('other types', () => {
it('should throw when given an invalid object', () => {
const pipe = new AsyncPipe(null as any);
expect(() => pipe.transform(<any>'some bogus object')).toThrowError();
});
});
});
}