Tips for creating unit tests using jasmine spy for window.location.pathname?

In my Angular 8 application, I am utilizing the OidcSecurityService for identity server.

Currently, I am working on writing some unit tests for it. However, I am facing a challenge with the following code section:

 ngOnInit() {
    this.oidcSecurityService
      .checkAuth()
 
      .subscribe(isAuthenticated => {
        if (!isAuthenticated) {
          Eif ('/autologin' !== window.location.pathname) {
            this.write('redirect', window.location.pathname);
            this.router.navigate(['/autologin']);
          }
        }
        if (isAuthenticated) {
          this.navigateToStoredEndpoint();
        }
      });
    //console.log('windowPath',  window.location.pathname);
  }

The complete TypeScript file is as follows:


export class AppComponent implements OnInit {
  title = 'cityflows-client';
  constructor(public oidcSecurityService: OidcSecurityService, public router: Router) {}

  ngOnInit() {
    this.oidcSecurityService
      .checkAuth()

      .subscribe(isAuthenticated => {
        if (!isAuthenticated) {
          if ('/autologin' !== window.location.pathname) {
            this.write('redirect', window.location.pathname);
            this.router.navigate(['/autologin']);
          }
        }
        if (isAuthenticated) {
          this.navigateToStoredEndpoint();
        }
      });
    //console.log('windowPath',  window.location.pathname);
  }

  // Other methods in the AppComponent class omitted for brevity...

}

My unit test is structured like this:

import { CommonModule } from '@angular/common';
import { TestBed, async, ComponentFixture } from '@angular/core/testing';
import { Router } from '@angular/router';
import { RouterTestingModule } from '@angular/router/testing';
import { OidcSecurityService } from 'angular-auth-oidc-client';
import { of } from 'rxjs';
import { AppComponent } from './app.component';
import { OidcSecurityServiceStub } from './shared/mocks/oidcSecurityServiceStub';

// Remaining lines of unit test code omitted for brevity...

However, when looking at the coverage report, I noticed an issue marked by an "E" on this line:

   if ('/autologin' !== window.location.pathname) {

It says "Else path not taken." How can I address this?

Thank you!

I found a solution by defining a property in the component:

public href: string = '/';

Then I updated the code as follows:

  ngOnInit() {
    this.oidcSecurityService
      .checkAuth()

      .subscribe(isAuthenticated => {
        if (!isAuthenticated) {
          if ('/autologin' !== this.href) { 
            this.write('redirect', this.href);
            this.router.navigate(['/autologin']);
          }
        }
        if (isAuthenticated) {
          this.navigateToStoredEndpoint();
        }
      });
   
  }

Answer №1

I encountered a similar issue while writing unit tests for my service file and after some research, I came across a solution that worked for me.

Here is the link I found helpful:

The concept involves using a function to retrieve the value of "window.location.pathname" which allows us to use "spyOn" on that function.

You can update your code as follows:

getPathname(): string {
  return window.location.pathname;
}

ngOnInit() {
  this.oidcSecurityService
    .checkAuth()

    .subscribe(isAuthenticated => {
      if (!isAuthenticated) {
        Eif('/autologin' !== this.getPathname()) {
          this.write('redirect', this.getPathname());
          this.router.navigate(['/autologin']);
        }
      }
      if (isAuthenticated) {
        this.navigateToStoredEndpoint();
      }
    });
  //console.log('windowPath',  this.getPathname());
}

Additionally, you can include another unit test like this:

it('Navigate if not authenticated', () => {
  spyOn(component.oidcSecurityService, 'checkAuth').and.returnValue( of (false));
  // Modify the value of "window.location.pathname" as needed in the following line.
  spyOn(component, 'getPathname').and.returnValue('/autologin');
  component.ngOnInit();
  expect(routerSpy.navigate).not.toHaveBeenCalledWith('/autologin');

});

Answer №2

Consider implementing the following code snippet:

it('should redirect to autologin page', () => {
  const oldPath = window.location.pathname;
  spyOn(component.oidcSecurityService, 'checkAuth').and.returnValue(of(false));
  window.location.pathname = '/differentPath'; // Unsure if this will update the URL.
// Changing the URL in the browser may have unintended consequences.
  component.ngOnInit();
  expect(routerSpy.navigate).toHaveBeenCalledWith('/autologin');
  window.location.pathname = oldPath; // revert back to original path
});

In place of location.pathname, it's recommended to use ActivatedRoute. This can be easily mocked in unit tests.

Link to ActivatedRoute documentation How to Implement ActivatedRoute in Angular 5?

You could also utilize the router to access the current URL. Retrieve Current URL in Angular

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