diff --git a/tests/Unit/File/X509/X509Test.php b/tests/Unit/File/X509/X509Test.php
index 375a4549..5a166b28 100644
--- a/tests/Unit/File/X509/X509Test.php
+++ b/tests/Unit/File/X509/X509Test.php
@@ -9,6 +9,55 @@ require_once 'File/X509.php';
 
 class Unit_File_X509_X509Test extends PhpseclibTestCase
 {
+    public function testExtensionMapping()
+    {
+        $test = '-----BEGIN CERTIFICATE-----
+MIIG1jCCBL6gAwIBAgITUAAAAA0qg8bE6DhrLAAAAAAADTANBgkqhkiG9w0BAQsF
+ADAiMSAwHgYDVQQDExcuU2VjdXJlIEVudGVycHJpc2UgQ0EgMTAeFw0xNTAyMjMx
+NTE1MDdaFw0xNjAyMjMxNTE1MDdaMD8xFjAUBgoJkiaJk/IsZAEZFgZzZWN1cmUx
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+0CmBJALIxtyz5P7sZhaHZFNdpKnx82QsauErqjP9H0RXc6VXX5qt+tEDvYfSlFcc
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+XW/TOP5m7JI/GrmvdlzI1AgwJ+zO8fOmCDuif99pDb1CvkzQ65RZ8p5J1ZV6hzlb
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+833K6qyjgHJT+fUzSEYpiwF5rSBJIGClOCY=
+-----END CERTIFICATE-----';
+
+        $x509 = new File_X509();
+
+        $cert = $x509->loadX509($test);
+
+        $this->assertInternalType('array', $cert['tbsCertificate']['extensions'][3]['extnValue']);
+    }
+
     public function testLoadUnsupportedExtension()
     {
         $test = '-----BEGIN CERTIFICATE-----