Implement attribute transforms for required attributes. I can now confidently say that output will always be valid.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@256 48356398-32a2-884e-a903-53898d9a118a

tests/HTMLPurifier/AttrTransform/BdoDirTest.php

@@ -0,0 +1,36 @@
+<?php
+
+require_once 'HTMLPurifier/AttrTransform/BdoDir.php';
+
+class HTMLPurifier_AttrTransform_BdoDirTest extends HTMLPurifier_AttrTransformHarness
+{
+    
+    function test() {
+        
+        $this->transform = new HTMLPurifier_AttrTransform_BdoDir();
+        
+        $inputs = array();
+        $expect = array();
+        $config = array();
+        
+        // add dir
+        $inputs[0] = array();
+        $expect[0] = array('dir' => 'ltr');
+        
+        // leave existing dir alone
+        $inputs[1] = array('dir' => 'rtl');
+        $expect[1] = array('dir' => 'rtl');
+        
+        $config_rtl = HTMLPurifier_Config::createDefault();
+        $config_rtl->set('Attr', 'DefaultTextDir', 'rtl');
+        $inputs[2] = array();
+        $expect[2] = array('dir' => 'rtl');
+        $config[2] = $config_rtl;
+        
+        $this->assertTransform($inputs, $expect, $config);
+        
+    }
+    
+}
+
+?>