work around bust encodings passed in to method

spec/helpers/application_helper_spec.rb

@@ -2,7 +2,16 @@ require 'spec_helper'
 
 describe ApplicationHelper do
 
-  describe 'mobile_view?' do
+  describe "escape_unicode" do
+    it "encodes tags" do
+      helper.escape_unicode("<tag>").should == "\u003ctag>"
+    end
+    it "survives junk text" do
+      helper.escape_unicode("hello \xc3\x28 world").should =~ /hello.*world/
+    end
+  end
+
+  describe "mobile_view?" do
     context "enable_mobile_theme is true" do
       before do
         SiteSetting.stubs(:enable_mobile_theme).returns(true)