Jasmine Angular 9 test failing because 'unreachable' stack trace at injectableDefOrInjectorDefFactory

Question

I created an Angular application under 4. I have migrated from version to version and am currently latest version 9. I was reviewing my tests. I have a Login component th

Answer 1

You can also create a mocked class to be used as your UserService:

class MockUserService {

  myMethod(): void {
    // mocked logic
  } 
}

describe('LoginComponent', () => {
...

providers: [
    ...
    { provide: UserService, useClass: MockUserService }
]
...

});

Answer 2

providers: [
    ...
    { provide: UserService, useClass: userServiceSpy }
]

Should be changed to:

providers: [
    ...
    { provide: UserService, useValue: userServiceSpy }
]