效果规范文件中的 SnackBar

Question

我正在尝试测试我的效果规范文件。我在效果文件中使用 matSnackBar。 当我 运行 它时，_snackbar 被声明为未定义，然后是测试字段。 这就是我试图做的：

describe('InquiryWizardEffects', () => {
let actions: Observable<any>;
let effects: InquiryWizardEffects;
let inquiryService: MockInquiryService;
let _snackBar: MatSnackBar;

beforeEach(() => {
    TestBed.configureTestingModule({
        imports: [
            NxModule.forRoot(),
            StoreModule.forRoot({}),
            EffectsModule.forRoot([]),
            MatSnackBarModule,
        ],
        providers: [
            InquiryWizardEffects,
            DataPersistence,
            provideMockActions(() => actions),
            { provide: InquiriesService, useClass: MockInquiryService },
            { provide: MatSnackBar}
        ]
    });
    _snackBar= TestBed.get(MatSnackBar);
    effects = TestBed.get(InquiryWizardEffects);
    inquiryService = TestBed.get(InquiriesService);
});

我做错了什么？

编辑

这是我得到的错误：

'Cannot read property 'openFromComponent' of undefined '

它在我做的时候来了:

this._snackBar.openFromComponent(CreatedEntitySnackBarComponent, {
            duration:  environment.longDurationSnackBar,
            panelClass: [style],
            horizontalPosition: 'right',
            data: {
                title: title,
                entityId: entityId
            }
        });
    }

Answer 1

您可以使用 "useValue" 提供 SnackBar 并伪造它。

describe('InquiryWizardEffects', () => {
let actions: Observable<any>;
let effects: InquiryWizardEffects;
let inquiryService: MockInquiryService;
beforeEach(() => {
    TestBed.configureTestingModule({
        imports: [
            NxModule.forRoot(),
            StoreModule.forRoot({}),
            EffectsModule.forRoot([]),
            MatSnackBarModule,
        ],
        providers: [
            InquiryWizardEffects,
            DataPersistence,
            provideMockActions(() => actions),
            { provide: InquiriesService, useClass: MockInquiryService },
            { provide: MatSnackBar, useVale: {openFromComponent: (param1, param2) => { return; }}},
        ]
    });
    effects = TestBed.get(InquiryWizardEffects);
    inquiryService = TestBed.get(InquiriesService);
});

试试看是否可行。