angular-docs-cn/modules/@angular/facade/test/async_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 {AsyncTestCompleter, describe, it, expect, beforeEach, ddescribe, iit, xit, inject,} from '@angular/core/testing/testing_internal';
import {browserDetection} from '@angular/platform-browser/testing/browser_util';
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import {ObservableWrapper, Observable, Subject, EventEmitter, PromiseWrapper} from '../src/async';
export function main() {
describe('EventEmitter', () => {
var emitter: EventEmitter<any>;
beforeEach(() => { emitter = new EventEmitter(); });
it('should call the next callback',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
ObservableWrapper.subscribe(emitter, (value) => {
expect(value).toEqual(99);
async.done();
});
ObservableWrapper.callEmit(emitter, 99);
}));
it('should call the throw callback',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
ObservableWrapper.subscribe(emitter, (_) => {}, (error) => {
expect(error).toEqual('Boom');
async.done();
});
ObservableWrapper.callError(emitter, 'Boom');
}));
it('should work when no throw callback is provided',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
ObservableWrapper.subscribe(emitter, (_) => {}, (_) => { async.done(); });
ObservableWrapper.callError(emitter, 'Boom');
}));
it('should call the return callback',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
ObservableWrapper.subscribe(emitter, (_) => {}, (_) => {}, () => { async.done(); });
ObservableWrapper.callComplete(emitter);
}));
it('should subscribe to the wrapper synchronously', () => {
var called = false;
ObservableWrapper.subscribe(emitter, (value) => { called = true; });
ObservableWrapper.callEmit(emitter, 99);
expect(called).toBe(true);
});
// Makes Edge to disconnect when running the full unit test campaign
// TODO: remove when issue is solved: https://github.com/angular/angular/issues/4756
if (!browserDetection.isEdge) {
it('delivers next and error events synchronously',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
let log: any[] /** TODO #9100 */ = [];
ObservableWrapper.subscribe(
emitter,
(x) => {
log.push(x);
expect(log).toEqual([1, 2]);
},
(err) => {
log.push(err);
expect(log).toEqual([1, 2, 3, 4]);
async.done();
});
log.push(1);
ObservableWrapper.callEmit(emitter, 2);
log.push(3);
ObservableWrapper.callError(emitter, 4);
log.push(5);
}));
it('delivers next and complete events synchronously', () => {
let log: any[] /** TODO #9100 */ = [];
ObservableWrapper.subscribe(
emitter,
(x) => {
log.push(x);
expect(log).toEqual([1, 2]);
},
null,
() => {
log.push(4);
expect(log).toEqual([1, 2, 3, 4]);
});
log.push(1);
ObservableWrapper.callEmit(emitter, 2);
log.push(3);
ObservableWrapper.callComplete(emitter);
log.push(5);
expect(log).toEqual([1, 2, 3, 4, 5]);
});
}
it('delivers events asynchronously when forced to async mode',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
var e = new EventEmitter(true);
var log: any[] /** TODO #9100 */ = [];
ObservableWrapper.subscribe(e, (x) => {
log.push(x);
expect(log).toEqual([1, 3, 2]);
async.done();
});
log.push(1);
ObservableWrapper.callEmit(e, 2);
log.push(3);
}));
it('reports whether it has subscribers', () => {
var e = new EventEmitter(false);
expect(ObservableWrapper.hasSubscribers(e)).toBe(false);
ObservableWrapper.subscribe(e, (_) => {});
expect(ObservableWrapper.hasSubscribers(e)).toBe(true);
});
// TODO: vsavkin: add tests cases
// should call dispose on the subscription if generator returns {done:true}
// should call dispose on the subscription on throw
// should call dispose on the subscription on return
});
describe('ObservableWrapper', () => {
it('should correctly check isObservable for EventEmitter', () => {
var e = new EventEmitter(false);
expect(ObservableWrapper.isObservable(e)).toBe(true);
});
it('should correctly check isObservable for Subject', () => {
var e = new Subject();
expect(ObservableWrapper.isObservable(e)).toBe(true);
});
it('should subscribe to EventEmitters', () => {
let e = new EventEmitter(false);
ObservableWrapper.subscribe(e, (val) => {});
ObservableWrapper.callEmit(e, 1);
ObservableWrapper.callComplete(e);
});
});
// See ECMAScript 6 Spec 25.4.4.1
describe('PromiseWrapper', () => {
describe('#all', () => {
it('should combine lists of Promises',
inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
var one = PromiseWrapper.completer();
var two = PromiseWrapper.completer();
var all = PromiseWrapper.all([one.promise, two.promise]);
var allCalled = false;
PromiseWrapper.then(one.promise, (_) => {
expect(allCalled).toBe(false);
two.resolve('two');
return null;
});
PromiseWrapper.then(all, (_) => {
allCalled = true;
async.done();
return null;
});
one.resolve('one');
}));
[null, true, false, 10, 'thing', {}, []].forEach(abruptCompletion => {
it(`should treat "${abruptCompletion}" as an "abrupt completion"`,
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inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
var one = PromiseWrapper.completer();
var all = PromiseWrapper.all([one.promise, abruptCompletion]);
PromiseWrapper.then(all, (val) => {
expect(val[1]).toEqual(abruptCompletion);
async.done();
});
one.resolve('one');
}));
});
});
});
}