fix test

Author: NathanFreeman

ext/mbstring/tests/gh9535.phpt

@@ -79,6 +79,12 @@ foreach($encodings as $encoding) {
     echo $encoding.': '.$reconverted_str.PHP_EOL;
 }
 
+echo PHP_EOL;
+
+foreach($encodings as $encoding) {
+    var_dump(mb_strcut($input, 0, $bytes_length, $encoding));
+}
+
 ?>
 --EXPECTF--
 BASE64: 宛如繁
@@ -180,3 +186,23 @@ ISO-2022-JP-MOBILE#KDDI: ??
 CP50220: ??
 CP50221: ??
 CP50222: ??
+
+string(0) ""
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"
+string(2) "??"