测试服务从 http.get 返回错误

Question

我有这项服务：

@Injectable({providedIn: 'root'})
export class CaseManagementService {

    constructor(private http: HttpService) {
    }

    getDocumentDetails(caseId: string, docId: string): Observable<DocumentDetails> {
        return this.http.get<DocumentDetails>(UrlConstants.CASES_URL + `/${caseId}/Documents/${docId}/Details`);
    }
}

出于测试目的，我创建了以下茉莉花测试：

it('should handle error when retrieving document details', () => {
    const errorResponse = new HttpErrorResponse({ error: 'error', status: 500 });
    spyOn(service['http'], 'get').and.returnValue(of(errorResponse));

    service.getDocumentDetails('case1', 'doc1').subscribe({
        next: () => fail('expected an error, not document details'),
        error: error => expect(error.message).toContain('error')
    });

    expect(service['http'].get).toHaveBeenCalledWith(UrlConstants.CASES_URL + '/case1/Documents/doc1/Details');
});

无论我做什么，我都会以我的

next

的

subscribe

部分结束，如果有人能向我解释我做错了什么，我将不胜感激。

Answer 1

您应该使用 throwError 而不是

of

。

import { throwError } from 'rxjs';

it('should handle error when retrieving document details', () => {
    const errorResponse = new HttpErrorResponse({ error: 'error', status: 500 });
    spyOn(service['http'], 'get').and.returnValue(throwError(() => errorResponse));

    service.getDocumentDetails('case1', 'doc1').subscribe({
        next: () => fail('expected an error, not document details'),
        error: error => expect(error.message).toContain('error')
    });

    expect(service['http'].get).toHaveBeenCalledWith(UrlConstants.CASES_URL + '/case1/Documents/doc1/Details');
});

HttpErrorResponse

本身不会抛出错误，并且

of

创建一个成功的可观察对象并发出一个值。