Add tests for simple article property script, fix error in previous

OPML xctest function (wrong name for test function).

EvergreenTests/ScriptingTests/scripts/testTitleOfArticlesWhose.applescript

@@ -0,0 +1,10 @@
+-- this script just tests that no error was generated from the script
+try
+	tell application "Evergreen"
+		title of every article of feed "Six Colors" where read is true
+	end tell
+on error message
+	return {test_result:false, script_result:message}
+end try
+
+return {test_result:true}