add test

Author: devnexen

ext/reflection/tests/gh21768.phpt

@@ -0,0 +1,21 @@
+--TEST--
+GH-21768: Assertion failure in ReflectionProperty::is{Readable,Writable}() on internal virtual properties
+--EXTENSIONS--
+dom
+--FILE--
+<?php
+
+$rc = new ReflectionClass('DOMDocument');
+foreach ($rc->getProperties() as $rp) {
+    if (!$rp->isVirtual())
+	    continue;
+    if (!$rp->isReadable(null))
+	    die("$rp should be readable");
+    if (!$rp->isWritable(null))
+	    die("$rp should be writable");
+}
+echo "done\n";
+
+?>
+--EXPECT--
+done