Visual Studio 2022 - Angular Service Not Injecting in Component Unit Tests
I'm trying to debug I'm working on an Angular application using Visual Studio 2022, and I'm having trouble with unit testing a service that isn't being injected properly into a component. I have a simple service named `DataService` and a component called `MyComponent`. The `DataService` is supposed to provide some data to `MyComponent`, but when I run the unit tests, I get the behavior: `NullInjectorError: No provider for DataService!`. I've already tried adding `DataService` to the `providers` array in my test bed configuration. Here’s how my unit test setup looks: ```typescript import { ComponentFixture, TestBed } from '@angular/core/testing'; import { MyComponent } from './my.component'; import { DataService } from './data.service'; describe('MyComponent', () => { let component: MyComponent; let fixture: ComponentFixture<MyComponent>; beforeEach(async () => { await TestBed.configureTestingModule({ declarations: [ MyComponent ], providers: [ DataService ] }).compileComponents(); }); beforeEach(() => { fixture = TestBed.createComponent(MyComponent); component = fixture.componentInstance; fixture.detectChanges(); }); it('should create', () => { expect(component).toBeTruthy(); }); }); ``` I initially thought this was a question with the way the service is imported, but I verified that `DataService` is correctly exported from its module. I even checked for circular dependencies, but everything seems fine. I also tried providing a mock version of `DataService`, but that didn’t resolve the scenario either: ```typescript class MockDataService { getData() { return of([]); } } ``` And updated the providers like this: ```typescript providers: [ { provide: DataService, useClass: MockDataService } ] ``` Despite these changes, the behavior continues. Any suggestions on what I might be missing or any additional configurations I should check? I'm using Angular version 12 with TypeScript 4.3.5. What am I doing wrong? The project is a CLI tool built with Typescript. Thanks for taking the time to read this!