ngrx/store - testing, throw TypeError: Cannot read property 'pipe' of undefined

Question

Here is my ts file:

this.store.pipe(select(subscribe.getRegCategories)).pipe(takeUntil(this.ngUnsubscribe)).subscribe(data => {
            if (data && data.length) {
                this.allRegCategories = data;
            }
        });

when i go for testing getting error as:

this.store.pipe(select(subscribe.getRegCategories)).pipe(takeUntil(this.ngUnsubscribe)).subscribe(data => {

TypeError: Cannot read property 'pipe' of undefined

how to provide the pipe here? what is the correct way to solve this?

Here is my test spec file:

import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { Store, select } from '@ngrx/store';
import { RouterTestingModule } from '@angular/router/testing';
import { HttpClientModule } from '@angular/common/http';
import { ShellViewProgMgmtComponent } from './shell-view-prog-mgmt.component';
import { ViewProgMgmtComponent } from './../../components/view-prog-mgmt/view-prog-mgmt.component';
import * as actions from './../../state/actions/setup-config.actions';

describe('ShellViewProgMgmtComponent', () => {
    let component: ShellViewProgMgmtComponent;
    let fixture: ComponentFixture<ShellViewProgMgmtComponent>;

    beforeEach(async(() => {
        TestBed.configureTestingModule({
            declarations: [ShellViewProgMgmtComponent, ViewProgMgmtComponent],
            imports: [HttpClientModule, RouterTestingModule],
            providers: [
            {
                provide: Store,
                useValue: {
                    dispatch: jest.fn(),
                    pipe: jest.fn()
                }
            }
            ]
        })
        .compileComponents();
    }));

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

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

    describe('ngOnInit()', () => {

        it('should dispatch an event resetEditPage action in ngOnit lifecycle', () => {

            const store = TestBed.get(Store);
            const action = actions.resetEditPage();
            const spy = jest.spyOn(store, 'dispatch');

            fixture.detectChanges();
            expect(spy).toHaveBeenCalledWith(action);

        });

    });
});

Answer 1

Please don't mock your own Store.

Instead use MockStore and/or mock selectors, as it will make your life easier. You can take a look at the implementation to find how you have to create a mock store, if this is what you want.

For more info about testing projects that use NgRx, see Testing an NgRx project.