DavidBurns adding a test for passing in a null to execute_script

git-svn-id: http://selenium.googlecode.com/svn/trunk/py@18270 07704840-8298-11de-bf8c-fd130f914ac9
diff --git a/test/selenium/webdriver/common/executing_javascript_tests.py b/test/selenium/webdriver/common/executing_javascript_tests.py
index ccc5f22..4e3221f 100644
--- a/test/selenium/webdriver/common/executing_javascript_tests.py
+++ b/test/selenium/webdriver/common/executing_javascript_tests.py
@@ -216,6 +216,11 @@
         res = self.driver.execute_script("return arguments[0]['foo'][1]", args);
 
         self.assertEqual(2, res)
+    
+    def testCanPassANone(self):
+        self._loadSimplePage() 
+        res = self.driver.execute_script("return arguments[0] === null", None)
+        self.assertTrue(res)
 
     def _pageURL(self, name):
         return "http://localhost:%d/%s.html" % (self.webserver.port, name)