我的.ts文件中有下一个代码：

import { getBuildUrl } from '../../service/navigationService';

const appUtils = require('../../utils/appUtils');

describe('Report Title suite tests', () => {

let getHostNameStub = jest.spyOn(appUtils, 'getHostName')
let getOrganizationNameStub = jest.spyOn(appUtils, 'getOrganizationName')
let getProjectNameStub = jest.spyOn(appUtils, 'getProjectName')

  describe('returnBuildUrl', () => {
    getHostNameStub.mockReturnValue("HostNametest")
    getOrganizationNameStub.mockReturnValue("OrganizationTest")
    getProjectNameStub.mockReturnValue("ProjectNameTest")
    
    it('should display title and description without report URL', async () => {
      expect(getBuildUrl("IdTest")).toBeDefined();
      expect(getBuildUrl("IdTest")).toEqual("https://HostNametest/OrganizationTest/ProjectNameTest/_build/results?buildId=IdTest")
    });
  });
});

正如您所看到的，appUtils方法是模拟的，但我在appUtils类中有下面的代码：const VSS_SDK = VSS;，例如：

const VSS_SDK = VSS;

    /**
     * return host name
     */
    export function getHostName() {
      return VSS_SDK.getWebContext().host.authority;
    }

VSS是在项目环境中提供的库
运行测试后，我收到错误：

Test suite failed to run

    ReferenceError: VSS is not defined

       8 |
       9 | // eslint-disable-next-line no-undef
    > 10 | const VSS_SDK = VSS;

是否可以模拟VSS库以避免此类错误？
getWebContext函数看起来像这样：

/**
        * Get the web context from the parent host
        */
function getWebContext(): WebContext;

和WebContext接口：

interface WebContext {
    account: HostContext;
    /**
    * Information about the Collection used in the current request (may be null)
    */
    collection: HostContext;
    /**
    * Information about the current request context's host
    */
    host: ExtendedHostContext;
    /**
    * Information about the project used in the current request (may be null)
    */
    project: ContextIdentifier;
    /**
    * Information about the team used in the current request (may be null)
    */
    team: TeamContext;
    /**
    * Information about the current user
    */
    user: UserContext;
}

使用建议的解决方案，我得到下一个错误：

Type '() => { host: { authority: string; }; }' is not assignable to type '() => WebContext'.
  Type '{ host: { authority: string; }; }' is missing the following properties from type 'WebContext': account, collection, project, team, userts(2322)
VSS.SDK.d.ts(201, 14): The expected type comes from property 'getWebContext' which is declared here on type 'typeof VSS