Testing _.extend() for underscore/lodash

gistfile1.coffee

describe "Underscore Extend", ->
  describe "simple objects", ->
    it "bequeaths properties", ->
      obj = 
        prop: "value"
      expect(_.extend({}, obj).prop).toEqual("value")
    
    it "bequeaths methods", ->
      obj = 
        meth: () ->
          "value"
      expect(_.extend({}, obj).meth()).toEqual("value")
    
  describe "defined classes", ->
    class Ancestor
      prop: "prop value"
      constructor: () ->
        @var = "var value"
  
      meth: () ->
        "meth value"
    
    it "bequeaths properties", ->
      # Fails in non-underscore lodash
      expect(_.extend({}, new Ancestor()).prop).toEqual("prop value") 
    
    it "bequeaths variables", ->
      expect(_.extend({}, new Ancestor()).var).toEqual("var value") 
    
    it "bequeaths instances", ->
      # Fails in non-underscore lodash
      expect(_.extend({}, new Ancestor()).meth?()).toEqual("meth value")