ERROR mocking getAllAccounts method with Jasmine and MsalService - Angular

I am facing issues with test-coverage using jasmine, for that I am working with MsalService-Entra (Microsoft Authentication Library) and Angular 15, I am using a method to get All user accounts from a list that MsalService library provides us and the idea is to create a test-coverage for that, specificaly for this line:

this.msalService.instance.getAllAccounts().length


So I tried in many ways but still I am having problems mocking that getAllAccounts method from msaservice library, this is my code that I tried and I hope you could help me with that.

login.ts

checkAndSetActiveAccount() {
if (this.msalService.instance && this.msalService.instance.getAllAccounts().length > 0) {
const accounts = this.msalService.instance.getAllAccounts();


This is my login.spec.ts

let msalServiceMock: jasmine.SpyObj<MsalService>;

beforeEach(waitForAsync(() => {
msalServiceMock = jasmine.createSpyObj('MsalService', ['instance', 'getAllAccounts']);

TestBed.resetTestingModule();
TestBed.configureTestingModule({
imports: [
RouterTestingModule.withRoutes(
[{path: 'home', component: HomeComponent}]
),
],
providers: [
{provide: MsalService, useValue: msalServiceMock}
],
declarations: [LoginComponent]
}).compileComponents();
}));
...

it('checkAndSetActiveAccount() check and validate Active Account', ()=> {

let mockAccounts =[
{ homeAccountId: '', environment:'', tenantId:'', username:'', localAccountId:'' }
];

//msalServiceMock = TestBed.inject(MsalService);
//mockMsalService.instance.setActiveAccount(mockData[0]);
//spyOn(msalServiceMock, 'instance').and.returnValue(mockAccounts);
spyOn(msalServiceMock.instance, 'getAllAccounts').and.returnValue(mockAccounts);
//spyOn(component.msalService.instance, 'getAllAccounts').and.returnValue(of(mockData));
component.checkAndSetActiveAccount();


Error on console:

Firefox 132.0 (Mac OS 10.15) LoginComponent processCredentials() is processing username and password checkAndSetActiveAccount() check and validate Active Account FAILED
Error: <spyOn> : getAllAccounts() method does not exist
Usage: spyOn(<object>, <methodName>) in node_modules/karma-jasmine/node_modules/jasmine-core/lib/jasmine-core/jasmine.js (line 9619)
<Jasmine>

Firefox 132.0 (Mac OS 10.15) LoginComponent processCredentials() is processing username and password username and password are empty strings FAILED
TypeError: this.msalService.instance.getAllAccounts is not a function in main.js (line 98918)

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