Question

I got a custom Backbone.Collection class in Coffeescript.

I named it (it is responsible for pagination):

class SI.PaginatedCollection extends Backbone.Collection

I want to write Jasmine spec which will test do I extends that particular class.

Sorry for my English, I now it is probably horrible. 😉

PS I can parse Javascript, but Coffeescript would be ideal.

Answer 1

It seems like overkill to me to test this, but you could do something like this:

describe "SI.PaginatedCollection", ->

  beforeEach ->
    @collection = new SI.PaginatedCollection()

  it "is a subclass of Backbone.Collection", ->
    expect(@collection instanceof Backbone.Collection).toBeTruthy()

If you’re going to be checking instanceof a lot and/or you care about descriptive Jasmine output, it would be worth making a custom matcher so you could write this:

expect(@collection).toBeInstanceOf(Backbone.Collection)