JAVASCRIPT

loader service show hide unit test angular

import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { SpinnerComponent } from './spinner.component';
import { of } from 'rxjs/observable/of';

describe('SpinnerComponent', () => {
  let component: SpinnerComponent;
  let fixture: ComponentFixture<SpinnerComponent>;
  const fakeSpinner = {
    spinnerState: of({ show: false }),
  };

  beforeEach(
    async(() => {
      TestBed.configureTestingModule({
        declarations: [SpinnerComponent],
        providers: [{ provide: SpinnerService, useValue: fakeSpinner }],
      }).compileComponents();
    }),
  );

  beforeEach(() => {
    fixture = TestBed.createComponent(SpinnerComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should set component.visible based on spinnerService state', () => {
    expect(component.visible).toEqual(false)
  });
});