纯Javascript回调问题

Question

我的代码中有以下两种方法：

    this.getUserForTest = function(usedPhoneNumber, userShouldBeRegistered, done) {
userShouldBeRegistered);
    getUser(usedPhoneNumber, function (isExist) {
        if(isExist === !userShouldBeRegistered) {
            usedPhoneNumber++;
            _that.getUserForTest(usedPhoneNumber, userShouldBeRegistered, done);
        } else {
            _that.testedPhoneNumber = usedPhoneNumber;
            console.log("found user number: " + usedPhoneNumber);
            deleteUserRegistrationAttmepts(_that.testedPhoneNumber, done);
        }
    });
};

this.cleanUpUser = function (phone, done) {
    loginUser(phone, function(userLoggedIn) {
        if (userLoggedIn === true) {
            getOauthToken(phone, function(gotOuth) {
                if (gotOuth === true) {
                    deleteUser(phone, done);
                }
            });
        }
    });
};

这些方法是我们通过以下命令运行的茉莉花测试套件的一部分：

beforeEach(function (done) {
        e2eHelperMethods.getUserForTest(initPhoneNumber, false, done);
        browser.get(e2eHelperMethods.defaultWebsiteUri);
    });

    afterEach(function (done) {
        e2eHelperMethods.cleanUpUser(e2eHelperMethods.testedPhoneNumber, done);
    });

当我尝试加入以下两个方法时，我收到一个错误，这可能意味着我遇到了一些异步问题：

this.cleanUpAndGetTestUser = function (phone, userShouldBeRegistered, done) {
    _that.cleanUpUser(phone, function(isDone) {
        if (isDone === true) {
            _that.getUserForTest(phone, userShouldBeRegistered, done);
        }
    });
};

如果有人可以指出我手边的问题，我将非常感激 - 必须有一个回调的东西，我忘了......