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?