Spec for linked resource type name demodulization

test/fixtures/poro.rb

@@ -47,6 +47,8 @@ Author = Class.new(Model)
 Bio = Class.new(Model)
 Blog = Class.new(Model)
 Role = Class.new(Model)
+module Spam; end
+Spam::UnrelatedLink = Class.new(Model)
 
 PostSerializer = Class.new(ActiveModel::Serializer) do
   attributes :title, :body, :id
@@ -56,6 +58,15 @@ PostSerializer = Class.new(ActiveModel::Serializer) do
   url :comments
 end
 
+SpammyPostSerializer = Class.new(ActiveModel::Serializer) do
+  attributes :id
+  has_many :related
+
+  def self.root_name
+    'posts'
+  end
+end
+
 CommentSerializer = Class.new(ActiveModel::Serializer) do
   attributes :id, :body
 
@@ -123,3 +134,7 @@ PostPreviewSerializer = Class.new(ActiveModel::Serializer) do
   has_many :comments, serializer: CommentPreviewSerializer
   belongs_to :author, serializer: AuthorPreviewSerializer
 end
+
+Spam::UnrelatedLinkSerializer = Class.new(ActiveModel::Serializer) do
+  attributes :id
+end