Testing components

test.ts

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

import { AnalyticsSelectorComponent } from './analytics-selector.component';
import { MatFormFieldModule, MatInputModule } from '@angular/material';
import { FormBuilder, ReactiveFormsModule, Validators } from '@angular/forms';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

describe('AnalyticsSelectorComponent', () => {
  let component: AnalyticsSelectorComponent;
  let fixture: ComponentFixture<AnalyticsSelectorComponent>;
  const formBuilder: FormBuilder = new FormBuilder();

  beforeEach(async(() => {

    TestBed.configureTestingModule({
      declarations: [AnalyticsSelectorComponent],
      imports: [MatFormFieldModule, ReactiveFormsModule, MatInputModule, BrowserAnimationsModule],
      providers: [ { provide: FormBuilder, useValue: formBuilder } ]
    })
      .compileComponents();
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(AnalyticsSelectorComponent);
    component = fixture.componentInstance;
    component.parent = formBuilder.group({
      google_analytics: ['google_analytics', Validators.required]
    });
    fixture.detectChanges();
  });

  it('should create', () => {
    expect(component).toBeTruthy();
  });
});