Coffee script factory pattern

gistfile1.coffee

class MyNamespace.MyView extends Backbone.View
  @Factory: ->
    create: ->
      new MyView

# then pass it in router initialization

class MyRouter extends Backbone.Router
  initialize: (opts = {}) ->
    myview_factory = opts.myview_factory || new MyNamespace.MyView.Factory

# why not just create new view in router? Answer: router becomes difficult to test as it is impossible to sensibly mock the view
# but this way it is dead simple:

describe 'MyRouter', ->
  it 'respondes to #foo with contents of MyView', ->
    myview = { render: @spy() }
    myview_factory = { create: @stub().returns(myview) }

    new MyRouter(myview_factory: myview_factory)

    expect(myview.render).toHaveBeenCalled()