Add test

Co-authored-by: divinity76 <[email protected]>

Author: nielsdos

ext/dom/tests/gh13960.phpt

@@ -0,0 +1,17 @@
+--TEST--
+GH-13960 (NULL bytes in XPath query)
+--EXTENSIONS--
+dom
+--FILE--
+<?php
+$domd = new DOMDocument();
+@$domd->loadHTML("<foo>tes\x00t</foo>");
+$xp = new DOMXPath($domd);
+try {
+    $xp->query("//foo[contains(text(), " . $xp->quote("tes\x00t") . ")]");
+} catch (ValueError $e) {
+    echo $e->getMessage(), "\n";
+}
+?>
+--EXPECT--
+DOMXPath::quote(): Argument #1 ($str) must not contain any null bytes