Angular TypeError:无法读取属性';订阅';使用karma运行jasmine测试时未定义的
我在使用jasmine和karma运行以下角度测试时出错。我怀疑的是打电话给 带订单组件中的getCurrencyCodes方法。它调用tradeservice getCurrencyCodes方法,该方法返回一个可观察值。 是嘲笑我做错了吗Angular TypeError:无法读取属性';订阅';使用karma运行jasmine测试时未定义的,angular,jasmine,Angular,Jasmine,我在使用jasmine和karma运行以下角度测试时出错。我怀疑的是打电话给 带订单组件中的getCurrencyCodes方法。它调用tradeservice getCurrencyCodes方法,该方法返回一个可观察值。 是嘲笑我做错了吗 TypeError: Cannot read property 'subscribe' of undefined StripOrdercomponent html ngOnInit() { this.getCurrencyCodes()
TypeError: Cannot read property 'subscribe' of undefined
StripOrdercomponent html
ngOnInit() {
this.getCurrencyCodes();
}
private getCurrencyCodes() {
this.tradeService.getCurrencyCodes()
.subscribe(
data => {
this.currencyList = data;
},
error => {
this.messageViewerModel.messages.push("Unable to get Currency codes");
});
}
带钢订单规格文件
class MockDateService {
}
class MockTradeService {
getCurrencyCodes() {
return;
}
}
class MockAuthService {
}
class MockOrderService {
}
class MockValueDateService {
}
class MockClientService {
}
class MockMessageViewerModel {
title: string;
messages: string[];
}
@Component({
selector: 'app-message-viewer',
template: ''
})
class MockMessageViewerComponent {
@Input()
messageViewer: MockMessageViewerModel;
}
describe('StripOrderComponent', () => {
let component: StripOrderComponent;
let clientService: ClientService;
let tradeService: TradeService;
let fixture: ComponentFixture<StripOrderComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
imports: [
HttpClientModule,
RouterTestingModule,
FormsModule,
TranslateModule.forRoot({
loader: {
provide: TranslateLoader,
useClass: TranslateLanguageLoader
}
})
],
declarations: [
StripOrderComponent,
MockMessageViewerComponent,
],
providers: [
[{ provide: DateService, useClass: MockDateService }],
[{ provide: TradeService, useClass: MockTradeService }],
[{ provide: AuthService, useClass: MockAuthService }],
[{ provide: OrderService, useClass: MockOrderService }],
[{ provide: ValueDateService, useClass: MockValueDateService }],
[{ provide: ClientService, useClass: MockClientService }]
],
schemas: [NO_ERRORS_SCHEMA]
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(StripOrderComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it('should be created', () => {
// spyOn(MockTradeService, 'getCurrencyCodes').and.returnValue({ subscribe: () => {} })
expect(component).toBeTruthy();
});
});
类MockDateService{
}
类MockTradeService{
getCurrencyCodes(){
返回;
}
}
类MockAuthService{
}
类MockOrderService{
}
类MockValueDateService{
}
类MockClientService{
}
类MockMessageViewerModel{
标题:字符串;
消息:字符串[];
}
@组成部分({
选择器:“应用程序消息查看器”,
模板:“”
})
类MockMessageViewerComponent{
@输入()
messageViewer:MockMessageViewerModel;
}
描述('StripOrderComponent',()=>{
let组件:StripOrderComponent;
let clientService:clientService;
让tradeService:tradeService;
let夹具:组件夹具;
beforeach(异步(()=>{
TestBed.configureTestingModule({
进口:[
HttpClientModule,
路由器测试模块,
FormsModule,
TranslateModule.forRoot({
加载器:{
提供:TranslateLoader,
useClass:TranslateLanguageLoader
}
})
],
声明:[
StripOrderComponent,
MockMessageViewerComponent,
],
供应商:[
[{提供:日期服务,useClass:MockDateService}],
[{provide:TradeService,useClass:MockTradeService}],
[{提供:AuthService,useClass:MockAuthService}],
[{提供:OrderService,useClass:MockOrderService}],
[{提供:ValueDateService,useClass:MockValueDateService}],
[{提供:ClientService,useClass:MockClientService}]
],
架构:[无错误\u架构]
})
.compileComponents();
}));
在每个之前(()=>{
fixture=TestBed.createComponent(StripOrderComponent);
组件=fixture.componentInstance;
fixture.detectChanges();
});
它('应该创建',()=>{
//spyOn(MockTradeService,'getCurrencyCodes').and.returnValue({subscribe:()=>{})
expect(component.toBeTruthy();
});
});
getCurrencyCodes必须返回Observable,以便您可以订阅它。因此,您需要返回可观察的(在模拟或spyOn中)。几个例子:
class MockTradeService {
getCurrencyCodes(): Observable<number> {
return from([1, 4, 5]);
}
}
如果要返回另一个值,请指定:
spyOn(MockTradeService, 'getCurrencyCodes').and.returnValue(from([9, 11, 7]));
因为您的`getCurrencyCodes()`返回
未定义的
spyOn(MockTradeService, 'getCurrencyCodes').and.returnValue(from([9, 11, 7]));