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I am trying to migrate angular js services to a new angular 7 app. However, each service has many dependencies on other angularjs services and I am not able to convert them all at the same time whilst continuing to create new features. How can I inject angular js services inside unit tests so that I can test my Angular 7 service?

tests.ts // test entry file

import 'core-js/es6';
import 'reflect-metadata';
import 'zone.js/dist/zone';
import 'zone.js/dist/long-stack-trace-zone';
import 'zone.js/dist/proxy';
import 'zone.js/dist/sync-test';
import 'zone.js/dist/jasmine-patch';
import 'zone.js/dist/async-test';
import 'zone.js/dist/fake-async-test';

import getTestBed from '@angular/core/testing';
import 
 BrowserDynamicTestingModule,
 platformBrowserDynamicTesting
 from '@angular/platform-browser-dynamic/testing';

declare const require: any;

// First, initialize the Angular testing environment.
getTestBed().initTestEnvironment(
 BrowserDynamicTestingModule,
 platformBrowserDynamicTesting()
);

// Then we find all the tests.
const context = require.context('./', true, /.spec.ts$/);

// And load the modules.
context.keys().map(context);

TestService.ts

import UpgradeModule from '@angular/upgrade/static';
import CHECKOUT_SERVICE from '../../../../ajs-upgraded-providers';

@Injectable(
 providedIn: 'root'
)
export class TestService 
 let checkout: any;
 constructor(@Inject(CHECKOUT_SERVICE) private checkoutService: any)
 this.checkout = checkoutService;
 

TestService.spec.ts

import TestBed from '@angular/core/testing';
import TestingService from './testing-service';
import CheckoutServiceProvider from 'ajs-upgraded-provider.ts'

describe('testing service with an injected AJS service', () => 
 let service: TestingService;
 TestBed.configureTestingModule(
 providers:[
 TestService,
 CheckoutServiceProvider
 ],
 imports:[ upgradeModule ]
 );
 service = TestBed.get(TestingService);
)
 it('instance should be created', () => 
 expect(expect(service).toBeTruthy();
 )
})

When running this unit test I get the following error:

Error: Trying to get the AngularJS injector before it being set.