123 lines
3.5 KiB
TypeScript
123 lines
3.5 KiB
TypeScript
import {XHR} from '../index';
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import {ListWrapper, Map} from '../src/facade/collection';
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import {isBlank, normalizeBlank} from '../src/facade/lang';
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import {BaseException} from '@angular/core';
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import {PromiseCompleter, PromiseWrapper} from '../src/facade/async';
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/**
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* A mock implementation of {@link XHR} 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 MockXHR extends XHR {
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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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var 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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var 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 BaseException('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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var urls = [];
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for (var i = 0; i < this._expectations.length; i++) {
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var expectation = this._expectations[i];
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urls.push(expectation.url);
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}
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throw new BaseException(`Unsatisfied requests: ${urls.join(', ')}`);
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}
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private _processRequest(request: _PendingRequest) {
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var url = request.url;
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if (this._expectations.length > 0) {
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var expectation = this._expectations[0];
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if (expectation.url == url) {
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ListWrapper.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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var response = this._definitions.get(url);
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request.complete(normalizeBlank(response));
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return;
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}
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throw new BaseException(`Unexpected request ${url}`);
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}
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}
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class _PendingRequest {
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url: string;
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completer: PromiseCompleter<string>;
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constructor(url) {
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this.url = url;
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this.completer = PromiseWrapper.completer();
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}
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complete(response: string) {
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if (isBlank(response)) {
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this.completer.reject(`Failed to load ${this.url}`, null);
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} else {
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this.completer.resolve(response);
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}
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}
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getPromise(): Promise<string> { return this.completer.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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