Proxyquire:无法存根Cassandra-驱动程序

Question

我试图为单元测试用例模拟cassandra，我使用npm Cassandra-driver来连接/查询Cassandra。为了模拟存根，这是我的代码。

beforeEach(function () {
        let CassandraClient = sinon.stub();
    CassandraClient.prototype.execute = sinon.stub().returns(new Promise((fulfill, reject) => {
        console.log("Inside execute method");
        fulfill(cassndaraExperimentQueryData);
    }));
    const CassandraClientWrapper = proxyquire('../../../../api/services/index.js', { 'cassandra-driver': { Client: CassandraClient } });
    console.log(typeof CassandraClientWrapper);
    CassandraClientWrapper.init();
    });

这是我的index.js的样子

   const cassandra = require('cassandra-driver');
    module.exports = class DBServices {
    init(){
    const contactPoint = process.env['cassndraIP'] || '127.0.0.1';
    var casssandraClient = new cassandra.Client({
              contactPoints: [contactPoint]
            });
let persistentObject  = new persistent(redisMockClient, casssandraClient)
    }
    }

但在这里，它不是创建模拟对象，而是从连接到实际数据库的Cassandra-driver创建对象。