Add AR integration tests

test/fixtures/active_record.rb

@@ -6,15 +6,16 @@ ActiveRecord::Base.establish_connection(
 )
 
 ActiveRecord::Schema.define do
-  create_table :ar_models, :force => true do |t|
-    t.string :attr1
-    t.string :attr2
+  create_table :ar_profiles, :force => true do |t|
+    t.string :name
+    t.string :description
+    t.string :comments
   end
 end
 
-class ARModel < ActiveRecord::Base
+class ARProfile < ActiveRecord::Base
 end
 
-class ARModelSerializer < ActiveModel::Serializer
-  attributes :attr1, :attr2
+class ARProfileSerializer < ActiveModel::Serializer
+  attributes :name, :description
 end

test/integration/active_record/active_record_test.rb

@@ -0,0 +1,31 @@
+require 'test_helper'
+require 'fixtures/active_record'
+require 'active_model/serializer'
+
+module ActiveModel
+  class Serializer
+    class ActiveRecordTest < ActiveModel::TestCase
+      def setup
+        @profile = ARProfile.new({ name: 'Name 1', description: 'Description 1', comments: 'Comments 1' })
+        @profile_serializer = ARProfileSerializer.new(@profile)
+      end
+
+      def test_attributes_definition
+        assert_equal(['name', 'description'],
+                     @profile_serializer.class._attributes)
+      end
+
+      def test_attributes_serialization_using_serializable_hash
+        assert_equal({
+          'name' => 'Name 1', 'description' => 'Description 1'
+        }, @profile_serializer.serializable_hash)
+      end
+
+      def test_attributes_serialization_using_as_json
+        assert_equal({
+          'name' => 'Name 1', 'description' => 'Description 1'
+        }, @profile_serializer.as_json)
+      end
+    end
+  end
+end