Add hooks for ApplicationMetalController

NEWS.md

@@ -3,7 +3,7 @@
 User-visible changes worth mentioning.
 
 ## master
-
+- [#873] Add hooks to Doorkeeper::ApplicationMetalController
 - [#871] Allow downstream users to better utilize doorkeeper spec factories by
   eliminating name conflict on `:user` factory.
 

app/controllers/doorkeeper/application_metal_controller.rb

@@ -11,5 +11,7 @@ class ApplicationMetalController < ActionController::Metal
     MODULES.each do |mod|
       include mod
     end
+
+    ActiveSupport.run_load_hooks(:doorkeeper_metal_controller, self)
   end
 end

spec/controllers/application_metal_controller.rb

@@ -0,0 +1,10 @@
+require "spec_helper_integration"
+
+describe Doorkeeper::ApplicationMetalController do
+  it "lazy run hooks" do
+    i = 0
+    ActiveSupport.on_load(:doorkeeper_metal_controller) { i += 1 }
+
+    expect(i).to eq 1
+  end
+end