ng-mat-daterange-picker/src/app/modules/ngx-mat-drp/services/range-store.service.spec.ts

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import { TestBed, inject } from '@angular/core/testing';
import { RangeStoreService, DATE } from './range-store.service';
import { InjectionToken } from '@angular/core';

describe('RangeStoreService', () => {
  beforeEach(() => {
    TestBed.configureTestingModule({
      providers: [
        RangeStoreService,
        {provide: DATE, useValue: new Date()}]
    });
  });

  it('should be created', inject([RangeStoreService], (service: RangeStoreService) => {
    expect(service).toBeTruthy();
  }));

  it('should update the store and emit range update', inject([RangeStoreService], (service:RangeStoreService) => {
    let rangeUpdateSub = service.rangeUpdate$.subscribe(
      val => {
        expect(val).toBeTruthy();
      }
    )
    service.updateRange();
    rangeUpdateSub.unsubscribe();
  }))

});