Typescript 为什么我不能创建新对象并设置属性？

我正在为TypeScript应用程序编写单元测试，无法定义新对象并设置属性。我的所有其他不需要对象类的测试都能正常工作，这只发生在测试期间，而不是在生产方法中使用非常相似的代码时

无法设置未定义的属性“eId”

候选者。ts

export class Candidate {
    public eId: string;
    public firstName: string;
    public lastName: string;
    public email: string;
    public address: string;
    public job: {
        title: string,
        eId: string,
    };
}

import { Candidate } from '../../../src/api/models/JCandidate';

test('Parse API model to API V2', async (done) => {
    const cController = new CController(cService, log)
    const jCandidate = new Candidate();
    jCandidate.eId = '23423'; //Error here
    jCandidate.email = 'Rogers@test.com';
    jCandidate.address = '123 Test Ave';
    jCandidate.job.eId = '1235';
    jCandidate.job.title = 'Test Job Title';
    jCandidate.firstName = 'Test';
    jCandidate.lastName = 'Name';
    const kCandidate = await cController.parseJCandidateToK(jCandidate);
    expect(kCandidate.name).toBe(jCandidate.firstName + ' ' + jCandidate.lastName);
    expect(kCandidate.jobId).toBe(jCandidate.job.eId);
    done();
});

测试.ts

export class Candidate {
    public eId: string;
    public firstName: string;
    public lastName: string;
    public email: string;
    public address: string;
    public job: {
        title: string,
        eId: string,
    };
}

import { Candidate } from '../../../src/api/models/JCandidate';

test('Parse API model to API V2', async (done) => {
    const cController = new CController(cService, log)
    const jCandidate = new Candidate();
    jCandidate.eId = '23423'; //Error here
    jCandidate.email = 'Rogers@test.com';
    jCandidate.address = '123 Test Ave';
    jCandidate.job.eId = '1235';
    jCandidate.job.title = 'Test Job Title';
    jCandidate.firstName = 'Test';
    jCandidate.lastName = 'Name';
    const kCandidate = await cController.parseJCandidateToK(jCandidate);
    expect(kCandidate.name).toBe(jCandidate.firstName + ' ' + jCandidate.lastName);
    expect(kCandidate.jobId).toBe(jCandidate.job.eId);
    done();
});

---

我看不出在您标记的行上会出现错误，但我希望在

jCandidate.job.eId='1235；'行，因为您从未创建
jCandidate.job
子对象。尝试替换：

jCandidate.job.eId = '1235';
jCandidate.job.title = 'Test Job Title';

与：