test.php

<?php

public function testException() {                                                                                   

  $this->expectExceptionMessage('DOMDocument::loadXML(): Opening and ending tag mismatch: baz line 3 and root in Entity, line: 4');                                                                                                     

  // invalid xml                                                                                                    
  $xml = '<root>
           <foo>bar</foo>
           <baz>
         </root>';                                                                                  

  $doc = new DOMDocument();
  $doc->loadXML($xml);

}