138 lines
3.8 KiB
TypeScript
138 lines
3.8 KiB
TypeScript
/**
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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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import {ResourceLoader} from '@angular/compiler';
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import {isBlank} from './facade/lang';
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/**
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* A mock implementation of {@link ResourceLoader} that allows outgoing requests to be mocked
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* and responded to within a single test, without going to the network.
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*/
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export class MockResourceLoader extends ResourceLoader {
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private _expectations: _Expectation[] = [];
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private _definitions = new Map<string, string>();
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private _requests: _PendingRequest[] = [];
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get(url: string): Promise<string> {
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const request = new _PendingRequest(url);
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this._requests.push(request);
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return request.getPromise();
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}
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/**
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* Add an expectation for the given URL. Incoming requests will be checked against
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* the next expectation (in FIFO order). The `verifyNoOutstandingExpectations` method
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* can be used to check if any expectations have not yet been met.
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*
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* The response given will be returned if the expectation matches.
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*/
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expect(url: string, response: string) {
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const expectation = new _Expectation(url, response);
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this._expectations.push(expectation);
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}
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/**
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* Add a definition for the given URL to return the given response. Unlike expectations,
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* definitions have no order and will satisfy any matching request at any time. Also
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* unlike expectations, unused definitions do not cause `verifyNoOutstandingExpectations`
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* to return an error.
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*/
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when(url: string, response: string) { this._definitions.set(url, response); }
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/**
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* Process pending requests and verify there are no outstanding expectations. Also fails
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* if no requests are pending.
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*/
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flush() {
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if (this._requests.length === 0) {
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throw new Error('No pending requests to flush');
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}
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do {
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this._processRequest(this._requests.shift());
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} while (this._requests.length > 0);
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this.verifyNoOutstandingExpectations();
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}
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/**
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* Throw an exception if any expectations have not been satisfied.
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*/
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verifyNoOutstandingExpectations() {
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if (this._expectations.length === 0) return;
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const urls: string[] = [];
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for (let i = 0; i < this._expectations.length; i++) {
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const expectation = this._expectations[i];
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urls.push(expectation.url);
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}
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throw new Error(`Unsatisfied requests: ${urls.join(', ')}`);
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}
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private _processRequest(request: _PendingRequest) {
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const url = request.url;
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if (this._expectations.length > 0) {
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const expectation = this._expectations[0];
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if (expectation.url == url) {
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remove(this._expectations, expectation);
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request.complete(expectation.response);
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return;
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}
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}
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if (this._definitions.has(url)) {
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const response = this._definitions.get(url);
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request.complete(response == null ? null : response);
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return;
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}
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throw new Error(`Unexpected request ${url}`);
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}
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}
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class _PendingRequest {
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resolve: (result: string) => void;
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reject: (error: any) => void;
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promise: Promise<string>;
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constructor(public url: string) {
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this.promise = new Promise((res, rej) => {
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this.resolve = res;
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this.reject = rej;
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});
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}
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complete(response: string) {
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if (isBlank(response)) {
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this.reject(`Failed to load ${this.url}`);
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} else {
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this.resolve(response);
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}
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}
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getPromise(): Promise<string> { return this.promise; }
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}
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class _Expectation {
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url: string;
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response: string;
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constructor(url: string, response: string) {
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this.url = url;
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this.response = response;
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}
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}
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function remove<T>(list: T[], el: T): void {
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const index = list.indexOf(el);
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if (index > -1) {
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list.splice(index, 1);
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}
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}
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