如何對Angular的canActivate進行單元測試？

Question

如何測試canActivate函數，該函數返回一個函數，該函數又返回一個boolean值？

我嘗試創建ActivatedrouterSnapshot和routerStateSnapshot對象並將其傳遞給canActivate函數，但這沒有幫助。

export class AuthGuard implements CanActivate {
constructor(
private authService: AuthenticationService,
private loginService: LoginService,
private router: Router
) {}

canActivate(
next: ActivatedRouteSnapshot,
state: RouterStateSnapshot): Observable<boolean> | Promise<boolean> 
| boolean {
return this.checkLogin(state.url);
}

checkLogin(url: string): boolean {
    if (this.authService.isLoggedIn()) {  return true; }

// Store the attempted URL for redirecting
this.loginService.redirectUrl = url;

// Navigate to the login page with extras
this.router.navigate(['/login']);
return false;
 }
}

由於checklogin返回true ，我希望發生這種情況。 但我不知道從哪里開始？

Answer 1

有很多方法可以做到這一點。 我會建議類似以下內容。 只是為了展示一些多樣性，我用一個類模擬了一個服務，用一個 spyObject 模擬了另一個服務。

這是建議的代碼：

class LoginMock implements Partial<LoginService> {
    redirectUrl: string;
}

describe('AuthGuard', () => {

    let authGuard: AuthGuard;
    let loginService: LoginMock;
    const routerMock = jasmine.createSpyObj('Router', ['navigate']);
    const authMock = jasmine.createSpyObj('AuthenticationService', ['isLoggedIn']);

    beforeEach(() => {
        loginService = new LoginMock();
        authGuard = new AuthGuard(authMock, loginService, routerMock);
    });

    it('should be createable', () => expect(authGuard).toBeTruthy());

    it('should return true for canActivate() and not set loginService.redirectUrl when isLoggedIn === true', ()=> {
        authMock.isLoggedIn.and.returnValue(true);
        const result = authGuard.canActivate(new ActivatedRouteSnapshot(), <RouterStateSnapshot>{url: 'testUrl'});
        expect(result).toBe(true);
        expect(loginService.redirectUrl).toBeUndefined();
    });

    it('should return false for canActivate() and set loginService.redirectUrl when isLoggedIn === false', ()=> {
        authMock.isLoggedIn.and.returnValue(false);
        const result = authGuard.canActivate(new ActivatedRouteSnapshot(), <RouterStateSnapshot>{url: 'testUrl'});
        expect(result).toBe(false);
        expect(loginService.redirectUrl).toEqual('testUrl');
    });

});

我已經為你把它放在了一個Stackblitz中。 隨意將其分叉到您自己的 Stackblitz 環境中並進行修改。

祝你好運。 :)

Answer 2

在這個電暈日，我在辦公室所能做的就是為某些應用程序進行單元測試。 我做的最后一個測試是一個 canActivate 服務，它看起來像這樣：

import {Injectable} from "@angular/core";
import {ActivatedRouteSnapshot, CanActivate, Router, RouterStateSnapshot} from "@angular/router";
import {UserProvider} from "../core/app-initializers/user-provider.service";
import {permissionsList} from "../shared/models/permissions.model";

@Injectable()
export class CreateArrangementPermissionService implements CanActivate {
  constructor(private router: Router, private userProvider: UserProvider) {}
  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
    if(route.params.idOrCreationKeyWord && route.params.idOrCreationKeyWord == 'create') {
      if (this.userProvider.getConnectedUsersApplicativeRoles().indexOf(permissionsList.DECLARANT) < 0) {
        this.router.navigate(['/forbidden']);
        return false;
      }
    }
    return true;
  }
}

我已經寫了測試：

import { CreateArrangementPermissionService } from "./create-arr-permission-service";
import { TestBed, getTestBed } from "@angular/core/testing";
import { UserProvider } from "../core/app-initializers/user-provider.service";
import { Router } from "@angular/router";

describe('CreateArrangementPermissionService Unit tests', () => {
    let injector: TestBed;
    let userProvider = {
        getConnectedUsersApplicativeRoles: function() {
            return 'zorro'
        }
    };

    let guard: CreateArrangementPermissionService;
    let routeMock: any = { 
        snapshot: {},
        params: {
            idOrCreationKeyWord: 'create'
        }
    };

    let routerStateMock: any = {
        snapshot: {},
        url: '/forbidden'
    };

    let routerMock = {
        navigate: jasmine.createSpy('navigate')
    };

    beforeEach(() => {
        TestBed.configureTestingModule({
            providers: [
                { provide: UserProvider, useValue: userProvider},
                { provide: Router, useValue: routerMock },
                AuthenticationErrorHandler,
                AuthenticationErrorCommunicator,
                CreateArrangementPermissionService,
            ]
        });
        injector = getTestBed();
        userProvider = injector.get(UserProvider);
        guard = injector.get(CreateArrangementPermissionService)
    });

    it('should redirect an unauthenticated user to forbidden', () => {
        expect(guard.canActivate(routeMock, routerStateMock)).toEqual(false);
        expect(routerMock.navigate).toHaveBeenCalledWith(['/forbidden'])
    });

    it('should allow the authenticated user to access app', () => {
        let routeMockAdmin: any = { 
            snapshot: {},
            params: {
                idOrCreationKeyWord: 'TPRM_ADMINISTRATOR'
            }
        };
        expect(guard.canActivate(routeMockAdmin, routerStateMock)).toEqual(true);
    });

});

通過這個測試，我在 SonarQube 上獲得了 89.5% 的覆蓋率，缺少對構造函數和“indexOf()”的一些測試。 希望這個例子能幫助其他人更容易地對 canActivate 進行正確的測試，然后我自己進行實驗。