Exploring URL Parameters in Angular Unit Testing

My goal is to execute a test to check for the presence of a specific string in URL parameters. Inside my TypeScript file, I have defined the following method:

checkURLParams() {
    if (this.route.parent) {
      this.route.parent.params.subscribe((params) => {
        if (params['view'] === 'view') {
          this.form.disable();
        }
      });
    }
  }

The primary objective of this test is to verify that when the URL parameters include the string 'view', the form should be disabled.

In my spec file, I currently have this setup:

beforeEach(async () => {
    await TestBed.configureTestingModule({
      declarations: [MyComponent],
      imports: [
        RouterTestingModule,
        ReactiveFormsModule
      ],
   
    }).compileComponents();
  });

  beforeEach(() => {
    fixture = TestBed.createComponent(MyComponent);
    component = fixture.componentInstance;
    component.ngOnInit();
    fixture.detectChanges();
  });

  fit('test', fakeAsync(() => {

    // Arrange


    // Act
    component.checkURLParams();


    // Assert
    expect(component.form.disabled).toBeTruthy();
  }));

I have come across various solutions for testing URL parameters differently, but I am struggling to find a way to mock the URL parameters within the test so that they contain 'view' and trigger the form disablement. What would be the most effective approach to tackle this challenge?

Answer №1

In a recent situation, I encountered the need to test URLs and their respective results.


  let newFixture: ComponentFixture<AppComponent>;
  let mainComponent: AppComponent;
  let targetLocation: Location;
  let routerService: Router;

  beforeEach(() => {
    targetLocation = TestBed.inject(Location);
    newFixture = TestBed.createComponent(AppComponent);
    mainComponent = newFixture.debugElement.componentInstance;
    routerService = TestBed.inject(Router);

    newFixture.ngZone.run(() => {
      routerService.initialNavigation();
    });
  });

  it('URL Testing', waitForAsync(() => {
      newFixture.ngZone.run(async () => {
        await routerService.navigate(['sampleUrl/With/Params']);
        newFixture.detectChanges();
        mainComponent.checkURLParameters();
        expect(mainComponent.form.disabled).toBeTruthy();
      });
    })
  );

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