Including backbone installed through bower in a node.js test script

I am having a gulp based project, and use browserify and debowerify to build the application. The application

1. Depends on Backbone - installed as bower component.
2. Has some additional domain classes which requires backbone.

I build 1 above as vendor.js and 2 above as app.js ,and include both these files in the html file, which runs fine

Now I am about to set up testing using tape, and I started off with testing the model class:

var todoModel = require('../../libs/todo/model/todo.js').Todo;
var test = require('tape');
var aTodo = new todoModel();

test('todo model test',function(t){
  eyes.inspect(atodo, "one");
  t.equal(1,one.valueOf(),'one should be equal to one');
  t.end();
});

libs/todo/model/todo.js:

  var Backbone = require('backbone');
  var Storage = require('../helpers/storage.js');
  var Todo = Backbone.Model.extend({
      ...
  })

When I run this test as tape test/model-test.js, I am getting an (expteced) error as Error: Cannot find module 'backbone'. So now, how do I make the bower candidate backbone be available to my node.js test script

Note: A simple workaround is to add the backbone as a node dependency, but what if a hypothetical library is available only in bower?