Undefined tests

Author: jmikola

tests/bson/bson-undefined-serialization-001.phpt

@@ -1,5 +1,8 @@
 --TEST--
-MongoDB\BSON\Undefined serialization
+MongoDB\BSON\Undefined serialization (Serializable interface)
+--SKIPIF--
+<?php require __DIR__ . "/../utils/basic-skipif.inc"; ?>
+<?php skip_if_php_version('>=', '7.4.0'); ?>
 --FILE--
 <?php
 

tests/bson/bson-undefined-serialization-002.phpt

@@ -0,0 +1,22 @@
+--TEST--
+MongoDB\BSON\Undefined serialization (__serialize and __unserialize)
+--SKIPIF--
+<?php require __DIR__ . "/../utils/basic-skipif.inc"; ?>
+<?php skip_if_php_version('<', '7.4.0'); ?>
+--FILE--
+<?php
+
+var_dump($undefined = MongoDB\BSON\toPHP(MongoDB\BSON\fromJSON('{ "undefined": {"$undefined": true} }'))->undefined);
+var_dump($s = serialize($undefined));
+var_dump(unserialize($s));
+
+?>
+===DONE===
+<?php exit(0); ?>
+--EXPECTF--
+object(MongoDB\BSON\Undefined)#%d (%d) {
+}
+string(34) "O:22:"MongoDB\BSON\Undefined":0:{}"
+object(MongoDB\BSON\Undefined)#%d (%d) {
+}
+===DONE===