模拟服务的角度单元测试

Question

我想对一个组件的功能进行单元测试。因此，我需要一个模拟服务（根据角度测试指南）。

这里是我的测试床：

            TestBed.configureTestingModule({
            declarations: [LanguageSelectorComponent],
            providers: [
                { provide: LanguageSelectorService, useValue: userServiceStub }]
        });

            let userServiceStub: Partial<LanguageSelectorService>;
        userServiceStub = {
            _languages:
                [
                    {
                        ID: '',
                        Name: '',
                        ImageSrc: ''
                    },
                    {
                        ID: '',
                        Name: '',
                        ImageSrc: ''
                    }
                ]
        };

那么，嘲笑服务价值的正确方法是什么呢？

弗兰克

Answer 1

服务代码：

    @Injectable()
export class LanguageSelectorService {
    _projectsUrl = 'languages.json';
    _configurationtemplatesUrl = 'configurationtemplates.json';
    _configurationtemplatePDFUrl = 'configurationtemplatePDF.json';
    _baseUrl: string;
    public _languages: Observable<ILanguage[]>;

    constructor(private _http: HttpClient, private _logger: NGXLogger) {
        this._baseUrl = '../../api';
        this._languages = this._http
            .get<ILanguage[]>(`${this._baseUrl}/${this._projectsUrl}`);
    }

    getLanguages(): Observable<ILanguage[]> {
        return this._languages;
    }
}