The pipe ' ' could not be found angular2 custom pipe

Question

I can\'t seem to fix this error. I have a search bar and an ngFor. I am trying to filter the array using a custom pipe like this:

Answer 1

If you see this error when running tests, make sure you have imported the module the pipe belongs to, e.g.:

    beforeEach(async(() => {
        TestBed.configureTestingModule({
            imports: [CustomPipeModule],
            declarations: [...],
            providers: [...],
            ...
        }).compileComponents();
    }));