@angular/compiler
Version:
Angular - the compiler library
124 lines • 13.6 kB
JavaScript
/**
* @license
* Copyright Google LLC 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';
/**
* 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 {
constructor() {
super(...arguments);
this._expectations = [];
this._definitions = new Map();
this._requests = [];
}
get(url) {
const request = new _PendingRequest(url);
this._requests.push(request);
return request.getPromise();
}
hasPendingRequests() {
return !!this._requests.length;
}
/**
* 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, response) {
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, response) {
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 = [];
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(', ')}`);
}
_processRequest(request) {
const url = request.url;
if (this._expectations.length > 0) {
const expectation = this._expectations[0];
if (expectation.url == url) {
remove(this._expectations, expectation);
request.complete(expectation.response);
return;
}
}
if (this._definitions.has(url)) {
const response = this._definitions.get(url);
request.complete(response == null ? null : response);
return;
}
throw new Error(`Unexpected request ${url}`);
}
}
class _PendingRequest {
constructor(url) {
this.url = url;
this.promise = new Promise((res, rej) => {
this.resolve = res;
this.reject = rej;
});
}
complete(response) {
if (response == null) {
this.reject(`Failed to load ${this.url}`);
}
else {
this.resolve(response);
}
}
getPromise() {
return this.promise;
}
}
class _Expectation {
constructor(url, response) {
this.url = url;
this.response = response;
}
}
function remove(list, el) {
const index = list.indexOf(el);
if (index > -1) {
list.splice(index, 1);
}
}
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Incoming requests will be checked against\n   * the next expectation (in FIFO order). The `verifyNoOutstandingExpectations` method\n   * can be used to check if any expectations have not yet been met.\n   *\n   * The response given will be returned if the expectation matches.\n   */\n  expect(url: string, response: string) {\n    const expectation = new _Expectation(url, response);\n    this._expectations.push(expectation);\n  }\n\n  /**\n   * Add a definition for the given URL to return the given response. Unlike expectations,\n   * definitions have no order and will satisfy any matching request at any time. Also\n   * unlike expectations, unused definitions do not cause `verifyNoOutstandingExpectations`\n   * to return an error.\n   */\n  when(url: string, response: string) {\n    this._definitions.set(url, response);\n  }\n\n  /**\n   * Process pending requests and verify there are no outstanding expectations. Also fails\n   * if no requests are pending.\n   */\n  flush() {\n    if (this._requests.length === 0) {\n      throw new Error('No pending requests to flush');\n    }\n\n    do {\n      this._processRequest(this._requests.shift()!);\n    } while (this._requests.length > 0);\n\n    this.verifyNoOutstandingExpectations();\n  }\n\n  /**\n   * Throw an exception if any expectations have not been satisfied.\n   */\n  verifyNoOutstandingExpectations() {\n    if (this._expectations.length === 0) return;\n\n    const urls: string[] = [];\n    for (let i = 0; i < this._expectations.length; i++) {\n      const expectation = this._expectations[i];\n      urls.push(expectation.url);\n    }\n\n    throw new Error(`Unsatisfied requests: ${urls.join(', ')}`);\n  }\n\n  private _processRequest(request: _PendingRequest) {\n    const url = request.url;\n\n    if (this._expectations.length > 0) {\n      const expectation = this._expectations[0];\n      if (expectation.url == url) {\n        remove(this._expectations, expectation);\n        request.complete(expectation.response);\n        return;\n      }\n    }\n\n    if (this._definitions.has(url)) {\n      const response = this._definitions.get(url);\n      request.complete(response == null ? null : response);\n      return;\n    }\n\n    throw new Error(`Unexpected request ${url}`);\n  }\n}\n\nclass _PendingRequest {\n  // TODO(issue/24571): remove '!'.\n  resolve!: (result: string) => void;\n  // TODO(issue/24571): remove '!'.\n  reject!: (error: any) => void;\n  promise: Promise<string>;\n\n  constructor(public url: string) {\n    this.promise = new Promise((res, rej) => {\n      this.resolve = res;\n      this.reject = rej;\n    });\n  }\n\n  complete(response: string|null) {\n    if (response == null) {\n      this.reject(`Failed to load ${this.url}`);\n    } else {\n      this.resolve(response);\n    }\n  }\n\n  getPromise(): Promise<string> {\n    return this.promise;\n  }\n}\n\nclass _Expectation {\n  url: string;\n  response: string;\n  constructor(url: string, response: string) {\n    this.url = url;\n    this.response = response;\n  }\n}\n\nfunction remove<T>(list: T[], el: T): void {\n  const index = list.indexOf(el);\n  if (index > -1) {\n    list.splice(index, 1);\n  }\n}\n"]}