Add a test for 'render :layout'

To make sure it will show block contents if it is placed after 'render
:partial'

[#5557 state:resolved]

Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>

actionpack/test/fixtures/test/_layout_with_partial_and_yield.html.erb

@@ -0,0 +1,4 @@
+Before
+<%= render :partial => "test/partial.html.erb" %>
+<%= yield %>
+After

actionpack/test/template/render_test.rb

@@ -209,6 +209,11 @@ module RenderTestCases
     @view.formats = nil
   end
 
+  def test_render_layout_with_block_and_other_partial_inside
+    render = @view.render(:layout => "test/layout_with_partial_and_yield.html.erb") { "Yield!" }
+    assert_equal "Before\npartial html\nYield!\nAfter\n", render
+  end
+
   def test_render_inline
     assert_equal "Hello, World!", @view.render(:inline => "Hello, World!")
   end