I have a problem with one test that is created from other tests similar to it, the problem is that this one particular test does not pass and I cannot understand what is causing this.

Code:

    it('should call notify on the channel', done => {
      httpServicePostMock.mockReturnValue({
        subscribe: fn => {
          fn({ data: { data: { flightPlans: flightplanss } } });
          done();
        },
      });
      const channelNotifyMock = jest.fn();
      jest.spyOn(channelGateway, 'notify').mockImplementation(channelNotifyMock);

      controller.addSubscriptionByDgsId('clientId', 'stand2');
      expect(channelNotifyMock).toBeCalledWith(['clientId'], 'flight_plans/stand2', JSON.stringify(flightplanss));
    });
  });

And the error says that number of calls is equal to 0.

Maybe someone can give me a hint how to fix it?