Move ShopVariantCtrl to own file and spec it

spec/javascripts/unit/darkswarm/controllers/checkout/shop_variant_controller_spec.js.coffee

@@ -0,0 +1,91 @@
+describe "ShopVariantCtrl", ->
+  ctrl = null
+  scope = null
+
+  beforeEach ->
+    module 'Darkswarm'
+    scope =
+      $watchGroup: ->
+      variant: {
+        on_demand: true
+        product: {group_buy: false}
+        line_item: {
+          quantity: 0
+          max_quantity: 0
+        }
+      }
+
+    inject ($controller, $modal)->
+      ctrl = $controller 'ShopVariantCtrl', {$scope: scope, $modal: $modal, Cart: null}
+
+  it "adds an item to the cart", ->
+    scope.add 1
+    expect(scope.variant.line_item.quantity).toEqual 1
+
+  it "adds to the existing quantity", ->
+    scope.add 1
+    scope.add 5
+    expect(scope.variant.line_item.quantity).toEqual 6
+
+  it "adds to the max quantity", ->
+    scope.addMax 5
+    expect(scope.variant.line_item.quantity).toEqual 0
+    expect(scope.variant.line_item.max_quantity).toEqual 5
+
+  it "adds to the max quantity to be at least min quantity", ->
+    scope.variant.product.group_buy = true
+    scope.variant.line_item.max_quantity = 2
+
+    scope.add 3
+
+    expect(scope.variant.line_item.quantity).toEqual 3
+    expect(scope.variant.line_item.max_quantity).toEqual 3
+
+  it "decreases the min quantity to not exceed max quantity", ->
+    scope.variant.product.group_buy = true
+    scope.variant.line_item.quantity = 3
+    scope.variant.line_item.max_quantity = 5
+
+    scope.addMax -3
+
+    expect(scope.variant.line_item.quantity).toEqual 2
+    expect(scope.variant.line_item.max_quantity).toEqual 2
+
+  it "allows adding when variant is on demand", ->
+    expect(scope.canAdd(5000)).toEqual true
+
+  it "denies adding if variant is out of stock", ->
+    scope.variant.on_demand = false
+    scope.variant.on_hand = 0
+
+    expect(scope.canAdd(1)).toEqual false
+
+  it "denies adding if stock is limitted", ->
+    scope.variant.on_demand = false
+    scope.variant.on_hand = 5
+
+    expect(scope.canAdd(4)).toEqual true
+    expect(scope.canAdd(5)).toEqual true
+    expect(scope.canAdd(6)).toEqual false
+
+    scope.add 3
+    expect(scope.canAdd(2)).toEqual true
+    expect(scope.canAdd(3)).toEqual false
+
+  it "denies declaring max quantity before item is in cart", ->
+    expect(scope.canAddMax(1)).toEqual false
+
+  it "allows declaring max quantity when item is in cart", ->
+    scope.add 1
+    expect(scope.canAddMax(1)).toEqual true
+
+  it "denies adding if stock is limitted", ->
+    scope.variant.on_demand = false
+    scope.variant.on_hand = 5
+    scope.variant.line_item.quantity = 1
+    scope.variant.line_item.max_quantity = 1
+
+    expect(scope.canAddMax(3)).toEqual true
+    expect(scope.canAddMax(4)).toEqual true
+    expect(scope.canAddMax(5)).toEqual false
+    expect(scope.canAddMax(6)).toEqual false