[TBT-393] update plan addons list on the UI (#1382)

* add freeto model and renderer for addon

* fix specs

* correct spec

Author: nikolaTrichkovski

lib/travis/api/v3/models/v2_addon.rb

@@ -1,13 +1,14 @@
 module Travis::API::V3
   class Models::V2Addon
-    attr_reader :id, :name, :type, :current_usage, :recurring
+    attr_reader :id, :name, :type, :current_usage, :recurring, :free
 
     def initialize(attrs)
       @id = attrs.fetch('id')
       @name = attrs.fetch('name')
       @type = attrs.fetch('type')
       @current_usage = attrs['current_usage'] && Models::V2AddonUsage.new(attrs['current_usage'])
       @recurring = attrs['recurring']
+      @free = attrs['free']
     end
   end
 end

lib/travis/api/v3/renderer/v2_addon.rb

@@ -1,7 +1,7 @@
 module Travis::API::V3
   class Renderer::V2Addon < ModelRenderer
-    representation(:standard, :id, :name, :type, :current_usage, :recurring)
-    representation(:minimal, :id, :name, :type, :current_usage, :recurring)
+    representation(:standard, :id, :name, :type, :current_usage, :recurring, :free)
+    representation(:minimal, :id, :name, :type, :current_usage, :recurring, :free)
 
     def current_usage
       Renderer.render_model(model.current_usage, mode: :standard) unless model.current_usage.nil?

spec/support/billing_spec_helper.rb

@@ -167,6 +167,7 @@ def billing_addons_response_body
           "name" => "OSS Build Credits",
           "type" => "credit_public",
           "recurring" => false,
+          "free" => false,
           "current_usage" => {
               "id" => 1,
               "addon_id" => 1,
@@ -184,6 +185,7 @@ def billing_addons_response_body
           "name" => "Build Credits",
           "type" => "credit_private",
           "recurring" => false,
+          "free" => false,
           "current_usage" => {
             "id" => 2,
             "addon_id" => 2,

spec/v3/services/v2_subscriptions/all_spec.rb

@@ -185,6 +185,7 @@
               'name' => 'OSS Build Credits',
               'type' => 'credit_public',
               'recurring' => false,
+              'free' => false,
               'current_usage' => {
                 '@type' => 'v2_addon_usage',
                 '@representation' => 'standard',
@@ -206,6 +207,7 @@
               'name' => 'Build Credits',
               'type' => 'credit_private',
               'recurring' => false,
+              'free' => false,
               'current_usage' =>
               {
                 '@type' => 'v2_addon_usage',

spec/v3/services/v2_subscriptions/create_spec.rb

@@ -159,6 +159,7 @@
               'created_at': '2017-11-28T00:09:59.502Z',
               'updated_at': '2017-11-28T00:09:59.502Z',
               'current_usage_id': 7,
+              'free': false,
               'current_usage': {
                 'id': 7,
                 'addon_id': 7,
@@ -309,6 +310,7 @@
             'name' => 'OSS Build Credits',
             'type' => 'credit_public',
             'recurring' => nil,
+            'free' => false,
             'current_usage' => {
               '@type' => 'v2_addon_usage',
               '@representation' => 'standard',