--- /dev/null
+--TEST--
+#523: assertAttributeEquals does not work with classes extending ArrayIterator
+--FILE--
+<?php
+$_SERVER['argv'][1] = '--no-configuration';
+$_SERVER['argv'][2] = 'Issue523Test';
+$_SERVER['argv'][3] = dirname(__FILE__) . '/523/Issue523Test.php';
+
+require __DIR__ . '/../../bootstrap.php';
+PHPUnit_TextUI_Command::main();
+?>
+--EXPECTF--
+PHPUnit %s by Sebastian Bergmann and contributors.
+
+.
+
+Time: %s, Memory: %s
+
+OK (1 test, 1 assertion)