Display extended variant name in quick cart

spec/javascripts/unit/darkswarm/services/cart_spec.js.coffee

@@ -6,7 +6,10 @@ describe 'Cart service', ->
 
   beforeEach ->
     module 'Darkswarm'
-    variant = {id: 1}
+    variant =
+      id: 1
+      name_to_display: 'name'
+      product_name: 'name'
     order = {
       line_items: [
         variant: variant
@@ -23,6 +26,9 @@ describe 'Cart service', ->
   it "registers variants with the Variants service", ->
     expect(Variants.variants[1]).toBe variant
 
+  it "generates extended variant names", ->
+    expect(Cart.line_items[0].variant.extended_name).toEqual "name"
+
   it "creates and backreferences new line items if necessary", ->
     Cart.register_variant(v2 = {id: 2})
     expect(Cart.line_items[1].variant).toBe v2
@@ -37,3 +43,23 @@ describe 'Cart service', ->
     expect(Cart.line_items_present()).toEqual []
     order.line_items[0].quantity = 2
     expect(Cart.total_item_count()).toEqual 2
+
+  describe "generating an extended variant name", ->
+    it "returns the product name when it is the same as the variant name", ->
+      variant = {product_name: 'product_name', name_to_display: 'product_name'}
+      expect(Cart.extendedVariantName(variant)).toEqual "product_name"
+
+    describe "when the product name and the variant name differ", ->
+      it "returns a combined name when there is no options text", ->
+        variant =
+          product_name: 'product_name'
+          name_to_display: 'name_to_display'
+        expect(Cart.extendedVariantName(variant)).toEqual "product_name - name_to_display"
+
+      it "returns a combined name when there is some options text", ->
+        variant =
+          product_name: 'product_name'
+          name_to_display: 'name_to_display'
+          options_text: 'options_text'
+
+        expect(Cart.extendedVariantName(variant)).toEqual "product_name - name_to_display (options_text)"