Add ActiveRecord-backed fixtures.

test/fixtures/active_record.rb

@@ -0,0 +1,58 @@
+require 'active_record'
+
+ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
+ActiveRecord::Schema.define do
+  create_table :posts, force: true do |t|
+    t.string :title
+    t.text :body
+    t.references :author
+    t.timestamps null: false
+  end
+  create_table :authors, force: true do |t|
+    t.string :name
+    t.timestamps null: false
+  end
+  create_table :comments, force: true do |t|
+    t.text :contents
+    t.references :author
+    t.references :post
+    t.timestamp null: false
+  end
+end
+
+module ARModels
+  class Post < ActiveRecord::Base
+    has_many :comments
+    belongs_to :author
+  end
+
+  class Comment < ActiveRecord::Base
+    belongs_to :post
+    belongs_to :author
+  end
+
+  class Author < ActiveRecord::Base
+    has_many :posts
+  end
+
+  class PostSerializer < ActiveModel::Serializer
+    attributes :id, :title, :body
+    params :title, :body
+
+    has_many :comments
+    belongs_to :author
+    url :comments
+  end
+
+  class CommentSerializer < ActiveModel::Serializer
+    attributes :id, :contents
+
+    belongs_to :author
+  end
+
+  class AuthorSerializer < ActiveModel::Serializer
+    attributes :id, :name
+
+    has_many :posts
+  end
+end

test/test_helper.rb

@@ -34,6 +34,8 @@ require 'support/stream_capture'
 
 require 'support/rails_app'
 
-require 'fixtures/poro'
-
 require 'support/test_case'
+
+require 'fixtures/active_record'
+
+require 'fixtures/poro'