Test::serialize()
Exception: Test::serialize() must return a string or NULL
===DONE===
+--UEXPECT--
+==========
+unicode(6) "String"
+Test::__construct(String)
+Test::serialize(String)
+Test::unserialize(String)
+object(Test)#1 (1) {
+ [u"data"]=>
+ unicode(6) "String"
+}
+object(Test)#1 (1) {
+ [u"data"]=>
+ unicode(6) "String"
+}
+==========
+NULL
+Test::__construct()
+Test::serialize()
+NULL
+==========
+int(42)
+Test::__construct(42)
+Test::serialize(42)
+Exception: Test::serialize() must return a string or NULL
+==========
+bool(false)
+Test::__construct()
+Test::serialize()
+Exception: Test::serialize() must return a string or NULL
+===DONE===