ngrx/store - 测试，抛出 TypeError：无法读取未定义的属性“管道”

Question

这是我的 ts 文件：

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

当我去测试时出现错误：

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

TypeError: Cannot read property 'pipe' of undefined

这里如何提供管道？解决这个问题的正确方法是什么？

这是我的测试规范文件：

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

请不要嘲笑自己的商店。

相反，使用MockStore和/或模拟选择器，因为它会让你的生活更轻松。如果您想要的话，您可以查看实现以了解如何创建模拟商店。

有关测试使用 NgRx 的项目的更多信息，请参阅测试 NgRx 项目。