diff --git a/tests/classes/array_conversion_keys.phpt b/tests/classes/array_conversion_keys.phpt
new file mode 100644
index 000000000000..e3bd7e03313d
--- /dev/null
+++ b/tests/classes/array_conversion_keys.phpt
@@ -0,0 +1,18 @@
+--TEST--
+Verifies the correct conversion of objects to arrays
+--FILE--
+<?php
+class foo
+{
+	private $private = 'private';
+	protected $protected = 'protected';
+	public $public = 'public';
+}
+var_export((array) new foo);
+?>
+--EXPECTF--
+array (
+  '' . "\0" . 'foo' . "\0" . 'private' => 'private',
+  '' . "\0" . '*' . "\0" . 'protected' => 'protected',
+  'public' => 'public',
+)
diff --git a/tests/classes/private_members_serialization.phpt b/tests/classes/private_members_serialization.phpt
new file mode 100644
index 000000000000..c8dd3ab248a0
--- /dev/null
+++ b/tests/classes/private_members_serialization.phpt
@@ -0,0 +1,23 @@
+--TEST--
+Verifies that it is possible to return private member names of parent classes in __sleep
+--FILE--
+<?php
+class foo
+{
+	private $private = 'private';
+	protected $protected = 'protected';
+	public $public = 'public';
+}
+
+class bar extends foo
+{
+	public function __sleep()
+	{
+		return array("\0foo\0private", 'protected', 'public');
+	}
+}
+
+var_dump(str_replace("\0", '\0', serialize(new bar())));
+?>
+--EXPECTF--
+string(114) "O:3:"bar":3:{s:12:"\0foo\0private";s:7:"private";s:12:"\0*\0protected";s:9:"protected";s:6:"public";s:6:"public";}"