--- /dev/null
+--TEST--
+Bug #3513 Support of RFC2231 in header fields. (ISO-2022-JP)
+--SKIPIF--
+--FILE--
+<?php
+mb_internal_encoding('ISO-2022-JP');
+$testEncoded="GyRCRnxLXDhsGyhCLnR4dA==";
+$test = base64_decode($testEncoded); // Japanese filename in ISO-2022-JP charset.
+require_once('Mail/mime.php');
+
+$Mime = new Mail_Mime();
+$Mime->addAttachment('testfile',"text/plain", $test, FALSE, 'base64', 'attachment', 'iso-2022-jp', '');
+
+$content = $Mime->get();
+$content = str_replace("\n", '', $content);
+
+if (preg_match('/filename([^\s]+)/i', $content, $matches)) {
+ echo $matches[1];
+}
+?>
+--EXPECT--
+*=iso-2022-jp''%1B$BF|K%5C8l%1B%28B.txt;
+