Angular unit test component that requires NbDialogService as a provider

I am trying to do a test that needs NbDialogService as a provider

providers: [
  { provide: NbDialogService, useClass: ClinicViewPopupComponent },
],

But this creates the error in the karma-jasmine browser:

NullInjectorError: StaticInjectorError(DynamicTestModule)[NbDialogService -> NbDialogRef]: 
StaticInjectorError(Platform: core)[NbDialogService -> NbDialogRef]: 
NullInjectorError: No provider for NbDialogRef!

So I updated the providers to:

providers: [
  { provide: NbDialogService, useClass: ClinicViewPopupComponent },
  { provide: NbDialogRef, useClass: ClinicViewPopupComponent }
],

And this returns an error:

Failed: Provider parse errors:
Cannot instantiate cyclic dependency! NbDialogRef ("[ERROR ->]"): in NgModule DynamicTestModule in ./DynamicTestModule@-1:-1

Switching useClass to useValue in { provide: NbDialogService, useValue: {} }, returns the same error as above

Switching useClass to useValue in { provide: NbDialogRef, useValue: {} }, returns UnhandledRejection

How can we fix that?