add mynyml's scope test (needs to be integrated)

test/scope.rb

@@ -0,0 +1,25 @@
+#!/usr/bin/env ruby
+require 'rubygems'
+require 'johnson/tracemonkey'
+require 'envjs/runtime'
+
+require 'nanotest'
+include Nanotest
+
+rt = Johnson::Runtime.new
+rt.extend(Envjs::Runtime)
+
+rt.evaluate('window.location = "http://example.com"')
+assert { 'Example Web Page' == rt.evaluate('window.document.title') }
+assert { 'Example Web Page' == rt.evaluate('this.document.title') }
+assert { 'Example Web Page' == rt.evaluate('document.title') }
+
+rt.evaluate('window.location = "http://montrealrb.org"')
+assert { 'Montreal.rb' == rt.evaluate('window.document.title') }
+
+# correct
+# assert { 'Montreal.rb' == rt.evaluate('this.document.title') }
+# buggy
+assert { 'Example Web Page' == rt.evaluate('this.document.title') }
+
+assert { 'Example Web Page' == rt.evaluate('document.title') }