add line item specs

Signed-off-by: Chris Boertien <[email protected]>

app/models/line_item_decorator.rb

@@ -2,9 +2,11 @@
   before_update :check_volume_pricing
 
   private
+
   def check_volume_pricing
     if changed? && changes.keys.include?("quantity")
       self.price = variant.volume_price(quantity)
     end
   end
 end
+

spec/models/line_item_spec.rb

@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+describe LineItem do
+  before :each do
+    @order = Factory(:order)
+    @variant = Factory(:variant, :price => 10)
+    @variant.volume_prices.create! :amount => 9, :range => '(2+)'
+    @order.add_variant(@variant, 1)
+    @line_item = @order.line_items.first
+  end
+
+  it 'should update the line item price when the quantity changes to match a range' do
+    @line_item.price.to_f.should == 10.00
+    @order.add_variant(@variant, 1)
+    @line_item.price.to_f.should == 9.00
+  end
+end
+