Javascript 在已解析的promise对象上测试hasOwnProperty（），并按承诺使用chai

我正在尝试运行以下测试：

describe('set()', function () {
    var returnedUser = session.set(user);

    it('should return a User object', function () {
        //this works fine
        return returnedUser.should.eventually.equal(user);
    });

    it('returned User object should have sessionId appended', function() {
        //DOES NOT WORK; always passes
        return returnedUser.should.eventually.hasOwnProperty('thisdoesnotexist');
    });
});

---

我试图找出正确的语法来测试返回的

User

对象是否包含

'sessionId'

属性。有人知道怎么做吗？

通过更仔细地观察Chaij一家发现了这一点

it('returned User object should have sessionId appended', function() {
    return returnedUser.should.eventually.include.keys('sessionId');
});