How to stub SOAP request with sinon in Node JS?

I am using strong-soap module to get data from SOAP request.

var soap = require('strong-soap').soap;

soap.createClient(url, options, function (err, client) {
     var method = client.GetInfoSOAP;
     method(requestQuery, function (err, info) {
      // bla bla
     }
}

I am getting the required data. Now I want to write unit test case to mock the SOAP request using sinon stub, but didn't get any success. Any help would be appreciated.

via s__k