Add support to render :once.

This will be used internally by sprockets to ensure requires are executed just once.

1 files changed, 73 insertions, 0 deletions

diff --git a/actionpack/test/controller/new_base/render_once_test.rb b/actionpack/test/controller/new_base/render_once_test.rb
new file mode 100644
index 0000000000..12892b7255
--- /dev/null
+++ b/actionpack/test/controller/new_base/render_once_test.rb
@@ -0,0 +1,73 @@
+require 'abstract_unit'
+
+module RenderTemplate
+  class RenderOnceController < ActionController::Base
+    layout false
+
+    RESOLVER = ActionView::FixtureResolver.new(
+      "test/a.html.erb"       => "a",
+      "test/b.html.erb"       => "<>",
+      "test/c.html.erb"       => "c",
+      "test/one.html.erb"     => "<%= render :once => 'test/result' %>",
+      "test/two.html.erb"     => "<%= render :once => 'test/result' %>",
+      "test/three.html.erb"   => "<%= render :once => 'test/result' %>",
+      "test/result.html.erb"  => "YES!",
+      "layouts/test.html.erb" => "l<%= yield %>l"
+    )
+
+    self.view_paths = [RESOLVER]
+
+    def multiple
+      render :once => %w(test/a test/b test/c)
+    end
+
+    def once
+      render :once => %w(test/one test/two test/three)
+    end
+
+    def duplicate
+      render :once => %w(test/a test/a test/a)
+    end
+
+    def with_layout
+      render :once => %w(test/a test/b test/c), :layout => "test"
+    end
+  end
+
+  module Tests
+    def test_mutliple_arguments_get_all_rendered
+      get :multiple
+      assert_response "a\n<>\nc"
+    end
+
+    def test_referenced_templates_get_rendered_once
+      get :once
+      assert_response "YES!\n\n"
+    end
+
+    def test_duplicated_templates_get_rendered_once
+      get :duplicate
+      assert_response "a"
+    end
+
+    def test_layout_wraps_all_rendered_templates
+      get :with_layout
+      assert_response "la\n<>\ncl"
+    end
+  end
+
+  class TestWithResolverCache < Rack::TestCase
+    testing RenderTemplate::RenderOnceController
+    include Tests
+  end
+
+  # TODO This still needs to be implemented and supported.
+  # class TestWithoutResolverCache < Rack::TestCase
+  #   testing RenderTemplate::RenderOnceController
+  #   include Tests
+  #
+  #   def setup
+  #     RenderTemplate::RenderOnceController::RESOLVER.stubs(:caching?).returns(false)
+  #   end
+  # end
+end