Share ActionView::TestCase's output_buffer with view for concat support.

[#3467 state:resolved]

Signed-off-by: Eloy Duran <eloy.de.enige@gmail.com>

actionpack/lib/action_view/test_case.rb

@@ -120,6 +120,7 @@ module ActionView
       def _view
         view = ActionView::Base.new(ActionController::Base.view_paths, _assigns, @controller)
         view.class.send :include, _helpers
+        view.output_buffer = self.output_buffer
         view
       end
 

actionpack/test/template/test_case_test.rb

@@ -38,6 +38,11 @@ module ActionView
         assert_equal 'Eloy', render('developers/developer', :developer => stub(:name => 'Eloy'))
       end
 
+      test "can render a layout with block" do
+        assert_equal "Before (ChrisCruft)\n!\nAfter",
+                      render(:layout => "test/layout_for_partial", :locals => {:name => "ChrisCruft"}) {"!"}
+      end
+
       helper AnotherTestHelper
       test "additional helper classes can be specified as in a controller" do
         assert test_case.ancestors.include?(AnotherTestHelper)