After retrieving allUsers from the cache and initializing it, I then set the boolean value of specialUserExists based on a condition in allUsers using allUsers.some() (reference to the Array.prototype.some() method).
service.ts
@Injectable({
providedIn: 'root'
})
export class SomeService {
private allUsers: User[] = this.storageService.getItem('SOME_KEY');
private specialUserExists = this.allUsers.some(user => user.inSpecialGroup);
constructor(
private filterService: FilterService,
private storageService: StorageService,
) { }
}
The test case written in service.specs.ts is as follows:
service.specs.ts:
describe('SomeService', () => {
let service: SomeService;
beforeEach(() => {
service = new SomeService(
mockFilterService.object(),
mockStorageService.object(),
);
});
it('should be created', () => {
expect(service).toBeTruthy();
});
}
Upon running ng-test, the following error is encountered:
<SomeService> should be created
TypeError: this.allUsers.some is not a function
at <Jasmine>
at new BreakdownService (http://localhost:9876/_karma_webpack_/src/app/_shared/services/some.service.ts:33:48)
at UserContext.<anonymous> (http://localhost:9876/_karma_webpack_/src/app/_shared/services/some.service.spec.ts:19:15)
...
Expected undefined to be truthy.
error properties: Object({ originalStack: 'Error: Expected undefined to be truthy.
...
Error: Expected undefined to be truthy.
at <Jasmine>
The code functions correctly and outputs the expected results. However, there seems to be an error in the test case setup and execution.
How can this issue be resolved?