@angular/common
Version:
Angular - commonly needed directives and services
148 lines • 18.8 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 { HttpEventType } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { TestRequest } from './request';
import * as i0 from "@angular/core";
/**
* A testing backend for `HttpClient` which both acts as an `HttpBackend`
* and as the `HttpTestingController`.
*
* `HttpClientTestingBackend` works by keeping a list of all open requests.
* As requests come in, they're added to the list. Users can assert that specific
* requests were made and then flush them. In the end, a verify() method asserts
* that no unexpected requests were made.
*
*
*/
export class HttpClientTestingBackend {
constructor() {
/**
* List of pending requests which have not yet been expected.
*/
this.open = [];
}
/**
* Handle an incoming request by queueing it in the list of open requests.
*/
handle(req) {
return new Observable((observer) => {
const testReq = new TestRequest(req, observer);
this.open.push(testReq);
observer.next({ type: HttpEventType.Sent });
return () => {
testReq._cancelled = true;
};
});
}
/**
* Helper function to search for requests in the list of open requests.
*/
_match(match) {
if (typeof match === 'string') {
return this.open.filter((testReq) => testReq.request.urlWithParams === match);
}
else if (typeof match === 'function') {
return this.open.filter((testReq) => match(testReq.request));
}
else {
return this.open.filter((testReq) => (!match.method || testReq.request.method === match.method.toUpperCase()) &&
(!match.url || testReq.request.urlWithParams === match.url));
}
}
/**
* Search for requests in the list of open requests, and return all that match
* without asserting anything about the number of matches.
*/
match(match) {
const results = this._match(match);
results.forEach((result) => {
const index = this.open.indexOf(result);
if (index !== -1) {
this.open.splice(index, 1);
}
});
return results;
}
/**
* Expect that a single outstanding request matches the given matcher, and return
* it.
*
* Requests returned through this API will no longer be in the list of open requests,
* and thus will not match twice.
*/
expectOne(match, description) {
description ||= this.descriptionFromMatcher(match);
const matches = this.match(match);
if (matches.length > 1) {
throw new Error(`Expected one matching request for criteria "${description}", found ${matches.length} requests.`);
}
if (matches.length === 0) {
let message = `Expected one matching request for criteria "${description}", found none.`;
if (this.open.length > 0) {
// Show the methods and URLs of open requests in the error, for convenience.
const requests = this.open.map(describeRequest).join(', ');
message += ` Requests received are: ${requests}.`;
}
throw new Error(message);
}
return matches[0];
}
/**
* Expect that no outstanding requests match the given matcher, and throw an error
* if any do.
*/
expectNone(match, description) {
description ||= this.descriptionFromMatcher(match);
const matches = this.match(match);
if (matches.length > 0) {
throw new Error(`Expected zero matching requests for criteria "${description}", found ${matches.length}.`);
}
}
/**
* Validate that there are no outstanding requests.
*/
verify(opts = {}) {
let open = this.open;
// It's possible that some requests may be cancelled, and this is expected.
// The user can ask to ignore open requests which have been cancelled.
if (opts.ignoreCancelled) {
open = open.filter((testReq) => !testReq.cancelled);
}
if (open.length > 0) {
// Show the methods and URLs of open requests in the error, for convenience.
const requests = open.map(describeRequest).join(', ');
throw new Error(`Expected no open requests, found ${open.length}: ${requests}`);
}
}
descriptionFromMatcher(matcher) {
if (typeof matcher === 'string') {
return `Match URL: ${matcher}`;
}
else if (typeof matcher === 'object') {
const method = matcher.method || '(any)';
const url = matcher.url || '(any)';
return `Match method: ${method}, URL: ${url}`;
}
else {
return `Match by function: ${matcher.name}`;
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.9", ngImport: i0, type: HttpClientTestingBackend, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "17.3.9", ngImport: i0, type: HttpClientTestingBackend }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.9", ngImport: i0, type: HttpClientTestingBackend, decorators: [{
type: Injectable
}] });
function describeRequest(testRequest) {
const url = testRequest.request.urlWithParams;
const method = testRequest.request.method;
return `${method} ${url}`;
}
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Users can assert that specific\n * requests were made and then flush them. In the end, a verify() method asserts\n * that no unexpected requests were made.\n *\n *\n */\n@Injectable()\nexport class HttpClientTestingBackend implements HttpBackend, HttpTestingController {\n  /**\n   * List of pending requests which have not yet been expected.\n   */\n  private open: TestRequest[] = [];\n\n  /**\n   * Handle an incoming request by queueing it in the list of open requests.\n   */\n  handle(req: HttpRequest<any>): Observable<HttpEvent<any>> {\n    return new Observable((observer: Observer<any>) => {\n      const testReq = new TestRequest(req, observer);\n      this.open.push(testReq);\n      observer.next({type: HttpEventType.Sent} as HttpEvent<any>);\n      return () => {\n        testReq._cancelled = true;\n      };\n    });\n  }\n\n  /**\n   * Helper function to search for requests in the list of open requests.\n   */\n  private _match(\n    match: string | RequestMatch | ((req: HttpRequest<any>) => boolean),\n  ): TestRequest[] {\n    if (typeof match === 'string') {\n      return this.open.filter((testReq) => testReq.request.urlWithParams === match);\n    } else if (typeof match === 'function') {\n      return this.open.filter((testReq) => match(testReq.request));\n    } else {\n      return this.open.filter(\n        (testReq) =>\n          (!match.method || testReq.request.method === match.method.toUpperCase()) &&\n          (!match.url || testReq.request.urlWithParams === match.url),\n      );\n    }\n  }\n\n  /**\n   * Search for requests in the list of open requests, and return all that match\n   * without asserting anything about the number of matches.\n   */\n  match(match: string | RequestMatch | ((req: HttpRequest<any>) => boolean)): TestRequest[] {\n    const results = this._match(match);\n    results.forEach((result) => {\n      const index = this.open.indexOf(result);\n      if (index !== -1) {\n        this.open.splice(index, 1);\n      }\n    });\n    return results;\n  }\n\n  /**\n   * Expect that a single outstanding request matches the given matcher, and return\n   * it.\n   *\n   * Requests returned through this API will no longer be in the list of open requests,\n   * and thus will not match twice.\n   */\n  expectOne(\n    match: string | RequestMatch | ((req: HttpRequest<any>) => boolean),\n    description?: string,\n  ): TestRequest {\n    description ||= this.descriptionFromMatcher(match);\n    const matches = this.match(match);\n    if (matches.length > 1) {\n      throw new Error(\n        `Expected one matching request for criteria \"${description}\", found ${matches.length} requests.`,\n      );\n    }\n    if (matches.length === 0) {\n      let message = `Expected one matching request for criteria \"${description}\", found none.`;\n      if (this.open.length > 0) {\n        // Show the methods and URLs of open requests in the error, for convenience.\n        const requests = this.open.map(describeRequest).join(', ');\n        message += ` Requests received are: ${requests}.`;\n      }\n      throw new Error(message);\n    }\n    return matches[0];\n  }\n\n  /**\n   * Expect that no outstanding requests match the given matcher, and throw an error\n   * if any do.\n   */\n  expectNone(\n    match: string | RequestMatch | ((req: HttpRequest<any>) => boolean),\n    description?: string,\n  ): void {\n    description ||= this.descriptionFromMatcher(match);\n    const matches = this.match(match);\n    if (matches.length > 0) {\n      throw new Error(\n        `Expected zero matching requests for criteria \"${description}\", found ${matches.length}.`,\n      );\n    }\n  }\n\n  /**\n   * Validate that there are no outstanding requests.\n   */\n  verify(opts: {ignoreCancelled?: boolean} = {}): void {\n    let open = this.open;\n    // It's possible that some requests may be cancelled, and this is expected.\n    // The user can ask to ignore open requests which have been cancelled.\n    if (opts.ignoreCancelled) {\n      open = open.filter((testReq) => !testReq.cancelled);\n    }\n    if (open.length > 0) {\n      // Show the methods and URLs of open requests in the error, for convenience.\n      const requests = open.map(describeRequest).join(', ');\n      throw new Error(`Expected no open requests, found ${open.length}: ${requests}`);\n    }\n  }\n\n  private descriptionFromMatcher(\n    matcher: string | RequestMatch | ((req: HttpRequest<any>) => boolean),\n  ): string {\n    if (typeof matcher === 'string') {\n      return `Match URL: ${matcher}`;\n    } else if (typeof matcher === 'object') {\n      const method = matcher.method || '(any)';\n      const url = matcher.url || '(any)';\n      return `Match method: ${method}, URL: ${url}`;\n    } else {\n      return `Match by function: ${matcher.name}`;\n    }\n  }\n}\n\nfunction describeRequest(testRequest: TestRequest): string {\n  const url = testRequest.request.urlWithParams;\n  const method = testRequest.request.method;\n  return `${method} ${url}`;\n}\n"]}