refactor(@schematics/angular): inject the service at setup

[kasaharu]

Suggestion

• I want to inject a service at setup at CLI-generated service spec file.

Why

• It is not necessary to inject service each test case.
• referrer: https://angular.io/guide/testing#angular-testbed

beforeEach(() => {
  TestBed.configureTestingModule({ providers: [ValueService] });
  service = TestBed.get(ValueService);
});

Version

• Angular CLI : 8.3.0

Generated code

current

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

import { HeroService } from './hero.service';

describe('HeroService', () => {
  beforeEach(() => TestBed.configureTestingModule({}));

  it('should be created', () => {
    const service: HeroService = TestBed.get(HeroService);
    expect(service).toBeTruthy();
  });
});

suggestion

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

import { HeroService } from './hero.service';

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

  beforeEach(() => {
    TestBed.configureTestingModule({});
    service = TestBed.get(HeroService);
  });

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

[clydin]

Looks good but can you adjust the commit message to be more descriptive?
Maybe something similar to refactor(@schematics/angular): use beforeEach to get service in service unit test

[kasaharu]

Thank you for your check 😄
I adjusted this commit message.

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