Add new test

tests/classes/interface_and_extends.phpt

@@ -0,0 +1,26 @@
+--TEST--
+ZE2 a class cannot extend an interface 
+--SKIPIF--
+<?php if (version_compare(zend_version(), '2.0.0-dev', '<')) die('skip ZendEngine 2 needed'); ?>
+--FILE--
+<?php
+
+interface Test
+{
+	function show();
+}
+
+class Tester extends Test
+{
+	function show() {
+		echo __METHOD__ . "\n";
+	}
+}
+
+$o = new Tester;
+$o->show();
+
+?>
+===DONE===
+--EXPECTF--
+Fatal error: Class Tester cannot extend from interfac Test in %sinterface_and_extends.php on line %d