diff --git a/tests/main/inc/lib/xht.lib.test.php b/tests/main/inc/lib/xht.lib.test.php
new file mode 100644
index 0000000000..8bd8d7b78e
--- /dev/null
+++ b/tests/main/inc/lib/xht.lib.test.php
@@ -0,0 +1,85 @@
+<?php
+
+class TestXht extends UnitTestCase {
+
+	public $xhtdoc;
+	public function TestXht(){
+		$this->UnitTestCase('test the library that define xht_htmlwchars & class xhtdoc with methods');
+	}
+	public function setUp(){
+		$this->xhtdoc = new xhtdoc();
+	}
+	
+	public function tearDown(){
+		$this->xhtdoc = null;
+	}
+	
+	public function testXhtHtmlwchars(){
+		global $charset;
+		$s='';
+		$res = xht_htmlwchars($s);
+		$this->assertTrue(is_string($res));
+		//var_dump($res);
+	}
+	
+	public function testXhtIsAssoclist(){
+		$s ='';
+		$res = xht_is_assoclist($s);
+		$this->assertTrue(is_bool($res));
+		$this->assertTrue($res === true || $res === false);
+		//var_dump($res);
+	}	
+	
+	public function testXhtExplodeAssoclist(){
+		$S =array(aaasasa);
+		$res = xht_explode_assoclist($S);
+		if(is_array($res))
+		$this->assertTrue(is_array($res));
+		else
+		$this->assertFalse(is_array($res));
+		//var_dump($res);
+	}
+	
+	public function testXhtFillTemplate(){
+		$template_name=null;
+		$cur_elem = 0;
+		$res = xhtdoc::xht_fill_template($template_name, $cur_elem);
+		$this->assertTrue(is_string($res));
+		//var_dump($res);
+	}
+	
+	public function testxhtSubstitute(){
+		global $charset;
+		$subtext='';
+		$cur_elem = 0; 
+		$pre = ''; 
+		$post = '';
+		$res = xhtdoc::xht_substitute($subtext, $cur_elem = 0, $pre = '', $post = '');
+		$this->assertTrue(is_string($res));
+		//var_dump($res);
+	}
+	
+	public function testXhtAddTemplate(){
+		$template_name='';
+		$httext='';
+		$res = xhtdoc::xht_add_template($template_name, $httext);
+		$this->assertTrue(is_null($res));
+		//var_dump($res);
+	}
+	
+	public function testXhtdoc(){
+		$htt_file_contents='document';
+		$res = xhtdoc::xhtdoc($htt_file_contents);
+		$this->assertTrue(is_null($res));
+		//var_dump($res);
+	}
+	
+	public function testShowParam(){
+		global $charset;
+		$result = '';
+		$res = xhtdoc::_show_param();
+		$this->assertTrue(is_string($res));
+		var_dump($res);
+	}
+}
+?>