//features/signin.usefeature

        Scenario: I sign in as "user-1" with email "user1@user1"
            Given I sign in as "user-1"
            Then I should be signed in
            Then I should see message "user1@user1"

//DevelopmentAuth.feature

      Scenario: I want to sign in as "user-1" with included steps
        Given I sign in as "user-1" with email "user1@user1": use steps "features/signin.usefeature"

      Scenario: I want to sign in as "user-2" with included steps
        Given I sign in as "user-2" with email "user2@user2": use steps "features/signin.usefeature"

// world.js
        var uze = require('cucumber.usesteps');
        uze.setSilent(false);
        uze.setRootDir(__dirname + '/../');

//features/support/Auth.js
    module.exports = function () {

        // just share steps
        require('cucumber.usesteps').share(this);

        this.Given(/^I am on the home page$/, function (callback) {
            this.iVisit('/', callback);
        });

        // ....
    }