feat: Mocking service

[satanTime]

The goal is not to provide an empty object as a provider, but to try to simulate existing methods.

What I tried to do was is to clone https://github.com/gothinkster/angular-realworld-example-app and to add a simple test which checks that app.component is rendered. And found that it fails with the error TypeError: this.userService.populate is not a function and I think if we mock at least methods of providers we should solve almost majority of issues except chaining this.userService.populate().test() but that's impossible without a metadata parser.

import {TestBed} from '@angular/core/testing';
import {BrowserModule} from '@angular/platform-browser';
import {AppRoutingModule} from 'app/app-routing.module';
import {AppComponent} from 'app/app.component';
import {AuthModule} from 'app/auth/auth.module';
import {CoreModule} from 'app/core';
import {HomeModule} from 'app/home/home.module';
import {SharedModule} from 'app/shared';
import {FooterComponent, HeaderComponent} from 'app/shared/layout';
import {MockComponents, MockModule, MockRender} from 'ng-mocks';

describe('test', () => {
  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [
        MockModule(BrowserModule),
        MockModule(CoreModule),
        MockModule(SharedModule),
        MockModule(HomeModule),
        MockModule(AuthModule),
        MockModule(AppRoutingModule),
      ],
      declarations: [
        ...MockComponents(FooterComponent, HeaderComponent),
        AppComponent,
      ],
    });
  });

  it('it', () => {
    const fixture = MockRender('<app-root></app-root>');
    expect(fixture.debugElement).toBeDefined();
  });
});

[satanTime]

in the next PR with the option to set mocking provider from outside I'll move this part to MockService.

[satanTime]

Wait :) need a proper implementation

[satanTime]

Done