From 1c361ea356aba4936347c83213b2adf50e2f4af2 Mon Sep 17 00:00:00 2001
From: Benjamin Fleischer <github@benjaminfleischer.com>
Date: Sun, 6 Dec 2015 16:49:52 -0600
Subject: Test ActionController::Renderers::use_renderers

---
 actionpack/CHANGELOG.md                            |  4 +++
 .../lib/action_controller/metal/renderers.rb       | 34 ++++++++++++++++++
 actionpack/test/abstract_unit.rb                   |  6 ++++
 actionpack/test/controller/metal/renderers_test.rb | 42 ++++++++++++++++++++++
 4 files changed, 86 insertions(+)
 create mode 100644 actionpack/test/controller/metal/renderers_test.rb

diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index b4b4e44383..ac767652b8 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Add tests and documentation for `ActionController::Renderers::use_renderers`.
+
+    *Benjamin Fleischer*
+
 *   Fix `ActionController::Parameters#convert_parameters_to_hashes` to return filtered
     or unfiltered values based on from where it is called, `to_h` or `to_unsafe_h`
     respectively.
diff --git a/actionpack/lib/action_controller/metal/renderers.rb b/actionpack/lib/action_controller/metal/renderers.rb
index 22e0bb5955..1f77f9ecaa 100644
--- a/actionpack/lib/action_controller/metal/renderers.rb
+++ b/actionpack/lib/action_controller/metal/renderers.rb
@@ -26,6 +26,40 @@ module ActionController
     end
 
     module ClassMethods
+
+      # Adds, by name, a renderer or renderers to the +_renderers+ available
+      # to call within controller actions.
+      #
+      # It is useful when rendering from an <tt>ActionController::Metal</tt> controller or
+      # otherwise to add an available renderer proc to a specific controller.
+      #
+      # Both <tt>ActionController::Base</tt> and <tt>ActionController::API</tt>
+      # include <tt>ActionController::Renderers::All</tt>, making all renderers
+      # avaialable in the controller. See <tt>Renderers::RENDERERS</tt> and <tt>Renderers.add</tt>.
+      #
+      # Since <tt>ActionController::Metal</tt> controllers cannot render, the controller
+      # must include <tt>AbstractController::Rendering</tt>, <tt>ActionController::Rendering</tt>,
+      # and <tt>ActionController::Renderers</tt>, and have at lest one renderer.
+      #
+      # Rather than including <tt>ActionController::Renderers::All</tt> and including all renderers,
+      # you may specify which renderers to include by passing the renderer name or names to
+      # +use_renderers+. For example, a controller that includes only the <tt>:json</tt> renderer
+      # (+_render_with_renderer_json+) might look like:
+      #
+      #   class MetalRenderingController < ActionController::Metal
+      #     include AbstractController::Rendering
+      #     include ActionController::Rendering
+      #     include ActionController::Renderers
+      #
+      #     use_renderers :json
+      #
+      #     def show
+      #       render json: record
+      #     end
+      #   end
+      #
+      # You must specify a +use_renderer+, else the +controller.renderer+ and
+      # +controller._renderers+ will be <tt>nil</tt>, and the action will fail.
       def use_renderers(*args)
         renderers = _renderers + args
         self._renderers = renderers.freeze
diff --git a/actionpack/test/abstract_unit.rb b/actionpack/test/abstract_unit.rb
index ef7aab72c6..604ba267d6 100644
--- a/actionpack/test/abstract_unit.rb
+++ b/actionpack/test/abstract_unit.rb
@@ -371,6 +371,12 @@ module RoutingTestHelpers
   end
 end
 
+class MetalRenderingController < ActionController::Metal
+  include AbstractController::Rendering
+  include ActionController::Rendering
+  include ActionController::Renderers
+end
+
 class ResourcesController < ActionController::Base
   def index() head :ok end
   alias_method :show, :index
diff --git a/actionpack/test/controller/metal/renderers_test.rb b/actionpack/test/controller/metal/renderers_test.rb
new file mode 100644
index 0000000000..007866a559
--- /dev/null
+++ b/actionpack/test/controller/metal/renderers_test.rb
@@ -0,0 +1,42 @@
+require 'abstract_unit'
+require 'active_support/core_ext/hash/conversions'
+
+class MetalRenderingJsonController < MetalRenderingController
+  class Model
+    def to_json(options = {})
+      { a: 'b' }.to_json(options)
+    end
+
+    def to_xml(options = {})
+      { a: 'b' }.to_xml(options)
+    end
+  end
+
+  use_renderers :json
+
+  def one
+    render json: Model.new
+  end
+
+  def two
+    render xml: Model.new
+  end
+end
+
+class RenderersMetalTest < ActionController::TestCase
+  tests MetalRenderingJsonController
+
+  def test_render_json
+    get :one
+    assert_response :success
+    assert_equal({ a: 'b' }.to_json, @response.body)
+    assert_equal 'application/json', @response.content_type
+  end
+
+  def test_render_xml
+    get :two
+    assert_response :success
+    assert_equal(" ", @response.body)
+    assert_equal 'text/plain', @response.content_type
+  end
+end
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