Add Registration::Addon.to_register

Which will return the addons pending to be registered.

src/lib/registration/addon.rb

@@ -71,6 +71,13 @@ def accepted
         selected.reject(&:eula_refused?)
       end
 
+      # Returns only those selected addons with accepted EULA but pending to be registered
+      #
+      # @return [Array<Addon>]
+      def to_register
+        accepted - registered
+      end
+
       # return add-ons which are registered but not installed in the system
       # and are available to install
       # @return [Array<Addon>] the list of add-ons

test/addon_spec.rb

@@ -140,11 +140,11 @@
     let(:registered) { Registration::Addon.new(addon_generator(params)) }
     let(:not_selected) { Registration::Addon.new(addon_generator(params)) }
     let(:available_addons) { [wo_eula, refused, accepted, registered, not_selected] }
-
-    let(:registration) { double(
-      get_addon_list: available_addons
+    let(:registration) do
+      double(
+        get_addon_list: available_addons
       )
-    }
+    end
 
     before do
       available_addons.each(&:selected)