Error: Undefined property 'pipe' cannot be read - Could this be due to missing configuration in my unit tests for Angular and ActivatedRoute?

I'm currently encountering a problem with an Observable that is based on the paramMap of my activatedRoute

this.current$ = this.route.paramMap.pipe(map(paramMap => paramMap.get('title')));

Everything works fine on the front-end, but now I am trying to write unit tests for my Angular component. My initial test setup looks like this:


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

  it('should create', () => {
    expect(component).toBeDefined();
  });

  it('should create', () => {
    expect(component).toBeDefined();
  });

However, when running the test, I keep getting the error message:

TypeError: Cannot read property 'pipe' of undefined

Despite having other simple tests set up, they all fail because of this issue. Am I overlooking something here?

Answer №1

If you want to simulate the Route, you could do it this way:

 
    {
      provide: ActivatedRoute,
      useValue: {
        snapshot: {
          paramMap: {
            get: (key: string) => {
              switch (key) {
                case 'title':
                  return 'mocked title';
                case 'description':
                  return 'mocked description'
              }
            }
          },
        },
      },
    }

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