add test case for js.erb partials on *.js formatted requests

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6735 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/test/controller/render_test.rb

@@ -388,6 +388,11 @@ def test_should_render_html_formatted_partial_with_rjs
     assert_equal %(Element.replace("foo", "partial html");), @response.body
   end
 
+  def test_should_render_js_partial
+    xhr :get, :partial, :format => 'js'
+    assert_equal 'partial js', @response.body
+  end
+
   protected
     def assert_deprecated_render(&block)
       assert_deprecated(/render/, &block)

actionpack/test/fixtures/test/_partial.js.erb

@@ -0,0 +1 @@
+partial js