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我想知道如何为npm包Inquirer.js编写单元测试，这是使CLI包更容易使用的工具。我已经阅读了这篇文章，但无法使其正常工作。

这是我的代码，需要进行测试：

const questions = [
                {
                    type: 'input',
                    name: 'email',
                    message: "What's your email ?",
                },
                {
                    type: 'password',
                    name: 'password',
                    message: 'Enter your password (it will not be saved neither communicate for other purpose than archiving)'
                }
            ];

            inquirer.prompt(questions).then(answers => {
                const user = create_user(answers.email, answers.password);
                let guessing = guess_unix_login(user);
                guessing.then(function (user) {
                    resolve(user);
                }).catch(function (message) {
                    reject(message);
                });
            } );

...这是用Mocha编写的测试：

describe('#create_from_stdin', function () {
            this.timeout(10000);
            check_env(['TEST_EXPECTED_UNIX_LOGIN']);
            it('should find the unix_login user and …