angular-cn/modules/@angular/compiler/testing/resource_loader_mock.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 {ResourceLoader} from '@angular/compiler';
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import {ListWrapper} from './facade/collection';
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import {isBlank} from './facade/lang';
/**
* A mock implementation of {@link ResourceLoader} that allows outgoing requests to be mocked
* and responded to within a single test, without going to the network.
*/
export class MockResourceLoader extends ResourceLoader {
private _expectations: _Expectation[] = [];
private _definitions = new Map<string, string>();
private _requests: _PendingRequest[] = [];
get(url: string): Promise<string> {
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const request = new _PendingRequest(url);
this._requests.push(request);
return request.getPromise();
}
/**
* Add an expectation for the given URL. Incoming requests will be checked against
* the next expectation (in FIFO order). The `verifyNoOutstandingExpectations` method
* can be used to check if any expectations have not yet been met.
*
* The response given will be returned if the expectation matches.
*/
expect(url: string, response: string) {
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const expectation = new _Expectation(url, response);
this._expectations.push(expectation);
}
/**
* Add a definition for the given URL to return the given response. Unlike expectations,
* definitions have no order and will satisfy any matching request at any time. Also
* unlike expectations, unused definitions do not cause `verifyNoOutstandingExpectations`
* to return an error.
*/
when(url: string, response: string) { this._definitions.set(url, response); }
/**
* Process pending requests and verify there are no outstanding expectations. Also fails
* if no requests are pending.
*/
flush() {
if (this._requests.length === 0) {
throw new Error('No pending requests to flush');
}
do {
this._processRequest(this._requests.shift());
} while (this._requests.length > 0);
this.verifyNoOutstandingExpectations();
}
/**
* Throw an exception if any expectations have not been satisfied.
*/
verifyNoOutstandingExpectations() {
if (this._expectations.length === 0) return;
const urls: string[] = [];
for (let i = 0; i < this._expectations.length; i++) {
const expectation = this._expectations[i];
urls.push(expectation.url);
}
throw new Error(`Unsatisfied requests: ${urls.join(', ')}`);
}
private _processRequest(request: _PendingRequest) {
const url = request.url;
if (this._expectations.length > 0) {
const expectation = this._expectations[0];
if (expectation.url == url) {
ListWrapper.remove(this._expectations, expectation);
request.complete(expectation.response);
return;
}
}
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if (this._definitions.has(url)) {
const response = this._definitions.get(url);
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request.complete(response == null ? null : response);
return;
}
throw new Error(`Unexpected request ${url}`);
}
}
class _PendingRequest {
resolve: (result: string) => void;
reject: (error: any) => void;
promise: Promise<string>;
constructor(public url: string) {
this.promise = new Promise((res, rej) => {
this.resolve = res;
this.reject = rej;
});
}
complete(response: string) {
if (isBlank(response)) {
this.reject(`Failed to load ${this.url}`);
} else {
this.resolve(response);
}
}
getPromise(): Promise<string> { return this.promise; }
}
class _Expectation {
url: string;
response: string;
constructor(url: string, response: string) {
this.url = url;
this.response = response;
}
}