'NullInjectorError: No provider for NotifierQueueService! Karma Angualr 6

Am using angular-notifier in my application .It is working well with imports import { NotifierModule } from 'angular-notifier'; in app.module.ts

and in spec.ts of component i have added import { NotifierService } from 'angular-notifier';

providers: [NotifierService] in TestBed

NullInjectorError: No provider for NotifierService : This resolved with above import in spec.ts

After that am facing this issue : NullInjectorError: No provider for NotifierQueueService!

I didn't find any import on NotifierQueueService.

Please help me with this am struggling with 2 working days .Do we have any solution for this.

unit-testingnotificationsangular6karma-jasmine


Solution 1:[1]

You should include NotifierModule into 'imports' section

import { NotifierService, NotifierModule } from 'angular-notifier';

// ...
 TestBed.configureTestingModule({
      imports: [NotifierModule]
// ...

Solution 2:[2]

This problem is usually a lack of service injection in providers.

Try add NotifierQueueService in providers inside TestBed.configureTestingModule

TestBed.configureTestingModule({
    declarations: [],
    providers: [NotifierQueueService] // Here
})

Solution 3:[3]

in service class after import section check whether below code is there

@Injectable({
  providedIn: 'root'
})

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Alexander Nied
Solution 2 Walteann Costa
Solution 3 nan

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