Add additional test for special cases for C14N

Author: nielsdos

ext/dom/tests/canonicalization_special_nodes.phpt

@@ -0,0 +1,37 @@
+--TEST--
+Test: Canonicalization with special nodes
+--EXTENSIONS--
+dom
+--FILE--
+<?php
+$xml = <<<EOXML
+<?xml version="1.0"?>
+<!DOCTYPE doc [
+]>
+<doc xmlns="">
+    <![CDATA[bar]]>
+    <!-- x -->
+    <temp xmlns=""/>
+    <?pi-no-data          ?>
+</doc>
+EOXML;
+
+$dom = new DOMDocument();
+$dom->loadXML($xml);
+$doc = $dom->documentElement;
+echo $doc->C14N(withComments: true);
+echo $doc->C14N(withComments: false);
+
+?>
+--EXPECT--
+<doc>
+    bar
+    <!-- x -->
+    <temp></temp>
+    <?pi-no-data?>
+</doc><doc>
+    bar
+    
+    <temp></temp>
+    <?pi-no-data?>
+</doc>