Angular TestBed is too long

foo.service.spec.ts

import { FooService } from './foo.service';
import { TestBed } from '@angular/core/testing';


function itLotOfTime(description: string, itBody: () => void) {
  for (let i = 0; i < 1000; i++) {
    it(description, itBody);
  }
}

describe('FooService by using inject', () => { // Takes ~5 seconds on my machine

  itLotOfTime('should be created', () => {
    TestBed.configureTestingModule({
      providers: [FooService]
    });
    const service: FooService = TestBed.get(FooService);
    expect(service).toBeTruthy();
  });
});

describe('FooService by new', () => { // Takes 1.3 seconds on my machine

  itLotOfTime('should be created', () => {
    expect(new FooService()).toBeTruthy();
  });
});