Angular Jasmine tests that continue upon previous tests

I have a service called items here is the spec file:

import { TestBed } from '@angular/core/testing';

import { ItemsService } from './items.service';

describe('ItemsListService', () => {
let service: ItemsService;

beforeEach(() => {
TestBed.configureTestingModule({});
service = TestBed.inject(ItemsService);
});

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

it('should insert new item', () => {
const item = {
id: '123',
name: 'item',
baseUnit: 'unit',
brand: 'brand',
price: 100,
quantity: 10,
supplier: 'supplier',
cost: 50,
imageUrl: 'url',
};
service.insertItem(item);
const items = service.getItems();
expect(items.length).toBeGreaterThan(0);
expect(items).toContain(item);
});
});


And here is another service called orders that depends on items service to create orders from items stored.

import { TestBed } from '@angular/core/testing';

import { OrdersService } from './orders.service';

describe('OrdersService', () => {
let service: OrdersService;

beforeEach(() => {
TestBed.configureTestingModule({});
service = TestBed.inject(OrdersService);
});

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

it('should insert new order', async () => {
const newOrder = await service.insertOrder(itemsService.getItems()[0]);
});
});


So in order for orders service to create a new order it needs to access the item stored inside items service here service.insertOrder(itemsService.getItems()[0]).

How do I access the same instance of items service created in the spec file?

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