it('should get Bluetooth data', () => {
    spyOn(instance, 'getBluetoothCurrentData').and.returnValue(new PromiseMock('[{\"blescan\":1,\"bledevice\":0,\"devices\":0,\"datastream\":0}]'));
    instance.setDisplayData();
    expect(instance.getBluetoothCurrentData).toHaveBeenCalled();
  });