我是测试领域的新手,刚刚开始为现有的 Angular 2 代码编写单元测试。我有一个函数confirmDelete
返回Obserable<boolean>
和内部使用ConfirmationService
PrimeNG 来获取用户对弹出窗口的反馈。
该函数的定义如下:
confirmDelete(): Observable<boolean> {
let confirmObservable = Observable.create((observer: Observer<boolean>) => {
this.confirmationService.confirm({
header: 'Delete Confirmation',
message: 'Do you really want to delete this record?',
accept: () => {
observer.next(true);
observer.complete();
},
reject: () => {
observer.next(false);
observer.complete();
}
});
});
return confirmObservable;
}
我想为这段代码编写一个单元测试。我计划为ConfirmationService
但因为我是单元测试世界的新手,我发现很难设置这些东西。
我的问题是在这种特定情况下编写单元测试的正确方法是什么。
EDIT:-
我尝试了 @peeskillet 提出的解决方案,但后来我开始收到类型不匹配错误ConfirmationService
and MockConfirmationService
.
以下是声明ConfirmationService
and Confirmation
PrimeNG 库中找到的类。
export interface Confirmation {
message: string;
icon?: string;
header?: string;
accept?: Function;
reject?: Function;
acceptVisible?: boolean;
rejectVisible?: boolean;
acceptEvent?: EventEmitter<any>;
rejectEvent?: EventEmitter<any>;
}
export declare class ConfirmationService {
private requireConfirmationSource;
private acceptConfirmationSource;
requireConfirmation$: Observable<Confirmation>;
accept: Observable<Confirmation>;
confirm(confirmation: Confirmation): this;
onAccept(): void;
}
我可能会让模拟保留参考文献accept
and reject
功能。然后在测试中您可以调用它们来检查它们是否发出正确的布尔值。就像是
class MockConfirmationService {
accept: Function;
reject: Function;
confirm(config: any) {
this.accept = config.accept;
this.reject = config.reject;
}
}
然后在你的测试中只需调用accept
测试一下true
被发出,并调用reject
测试一下false
被发射。
describe('serivce: ModalService', () => {
let modalService: ModalService;
let confirmService: MockConfirmationService;
beforeEach(() => {
confirmService = new MockConfirmationService();
TestBed.configureTestingModule({
providers: [
ModalService,
{ provide: ConfirmationService, useValue: confirmService }
]
});
modalService = TestBed.get(ModalService);
});
it('should return true when accepted', async(() => {
modalService.confirmDelete().subscribe(result => {
expect(result).toBe(true);
console.log('accepted test complete');
});
confirmService.accept();
}));
it('should return false when rejected', async(() => {
modalService.confirmDelete().subscribe(result => {
expect(result).toBe(false);
console.log('rejected test complete');
});
confirmService.reject();
}));
});
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