I have an angular service that performs API calls. it has a method to login and store the access token in the service for the subsequent API call to use. When I run unit test, I first test the login method, then test the other API calls methods. But the other API calls test fail because the stored token become undefined. How do I preserve the service state so that I don’t need to login again in every spec?

api.service.ts

@Injectable({
    providedIn: 'root'
})
export class ApiService {

    private token?: string;

    async login(username:string, password: string): Promise<boolean>{
        const token = /* method to get token */;
        this.token = token;
        return true;
    }

    async someApiCall(): Promise<string>{
        const res = /* fetch using this.token */
        return res;
    }
}

api.service.spec.ts

describe("ApiService", () => {
    let service: ApiService;

    beforeEach(() => {
        TestBed.configureTestingModule({
            imports: [
                RouterTestingModule,
                TranslateModule.forRoot(),
            ],
        });
        service = TestBed.inject(ApiService);
    });

    it("should be created", () => {
        expect(service).toBeTruthy();
    });

    it("can login", async () => {
        const isLoggedIn = await service.login(
            testenv.username,
            testenv.password
        );
        expect(isLoggedIn).toBeTruthy();
    });

    it("can do some api call", async () => {
        const res = await service.someApiCall();
        expect(res).toBeTruthy();
    });
});