Unit testing Backbone Views

Unit testing with mocha,sinon,chai , jsdom.

When I unit test Backbone Views, I get the error $el.toolTip is not a function.

toolTip is actually defined in bootstrap.js file.

I am not sure whether I have to load bootstrap in nodejs env. (since the tests run in nodejs).

How to load the bootstrap file in nodejs env or in jsdom?

Can someone help here?