Add basic support for adding discounts to subscriptions.

README.md

@@ -12,7 +12,7 @@ Currently in alpha (i.e. it does not support every Braintree call).
 
 ### Customer
 * `Braintree::Customer.find`
-* `Braintree::Customer.create`
+* `Braintree::Customer.create` (including adding add-ons and discounts)
 * `Braintree::Customer.update`
 * `Braintree::Customer.delete`
 

lib/fake_braintree/subscription.rb

@@ -25,7 +25,7 @@ def subscription_hash
       subscription_hash["id"]                   ||= subscription_id
       subscription_hash["transactions"]         = []
       subscription_hash["add_ons"]              = added_add_ons
-      subscription_hash["discounts"]            = []
+      subscription_hash["discounts"]            = added_discounts
       subscription_hash["plan_id"]              = @subscription_hash["plan_id"]
       subscription_hash["next_billing_date"]    = braintree_formatted_date(1.month.from_now)
       subscription_hash["payment_method_token"] = @subscription_hash["payment_method_token"]
@@ -60,5 +60,13 @@ def added_add_ons
         []
       end
     end
+
+    def added_discounts
+      if @subscription_hash["discounts"] && @subscription_hash["discounts"]["add"]
+        @subscription_hash["discounts"]["add"].map { |discount| { "id" => discount["inherited_from_id"] } }
+      else
+        []
+      end
+    end
   end
 end

spec/fake_braintree/subscription_spec.rb

@@ -60,6 +60,15 @@
     add_ons.size.should == 1
     add_ons.first.id.should == add_on_id
   end
+
+  it "returns discounts added with the subscription" do
+    discount_id = "def456"
+    subscription_id = create_subscription(:discounts => { :add => [{ :inherited_from_id => discount_id, :amount => BigDecimal.new("15.00") }]}).subscription.id
+    subscription = Braintree::Subscription.find(subscription_id)
+    discounts = subscription.discounts
+    discounts.size.should == 1
+    discounts.first.id.should == discount_id
+  end
 end
 
 describe "Braintree::Subscription.update" do