Make sure assert_select_rjs gets counted, Closes #10278 [tarmo]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8237 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_controller/assertions/selector_assertions.rb

@@ -439,6 +439,7 @@ module ActionController
         end
 
         if matches
+          assert_block("") { true } # to count the assertion
           if block_given? && !([:remove, :show, :hide, :toggle].include? rjs_type)
             begin
               in_scope, @selected = @selected, matches
@@ -603,4 +604,4 @@ module ActionController
         end
     end
   end
-end
+end