1 files changed, 12 insertions, 0 deletions
diff --git a/activemodel/test/models/topic.rb b/activemodel/test/models/topic.rb
index ff34565bdb..c9af78f595 100644
--- a/activemodel/test/models/topic.rb
+++ b/activemodel/test/models/topic.rb
@@ -2,6 +2,10 @@ class Topic
   include ActiveModel::Validations
   include ActiveModel::Validations::Callbacks
 
+  def self._validates_default_keys
+    super | [ :message ]
+  end
+
   attr_accessor :title, :author_name, :content, :approved
   attr_accessor :after_validation_performed
 
@@ -25,4 +29,12 @@ class Topic
     self.after_validation_performed = true
   end
 
+  def my_validation
+    errors.add :title, "is missing" unless title
+  end
+
+  def my_validation_with_arg(attr)
+    errors.add attr, "is missing" unless send(attr)
+  end
+
 end