Fix test_gpg_binary_version_str() to detect correct output from 'gpg --version'.

test_gnupg.py

@@ -125,10 +125,15 @@ class GPGTestCase(unittest.TestCase):
     def test_gpg_binary_version_str(self):
         "That that 'gpg --version' returns the expected output"
         proc = self.gpg._open_subprocess(['--version'])
-        result = io.StringIO()
+        result = ""
         self.gpg._collect_output(proc, result, stdin=proc.stdin)
-        result.fpr
-        self.assertGreater((result.find("AES")), 0)
+        expected = """gpg (GnuPG) 1.4.12
+Copyright (C) 2012 Free Software Foundation, Inc.
+License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permit"""
+        logger.debug("'gpg --version' returned output:n%s" % result)
+        self.assertEqual(result, expected)
 
     def test_gpg_binary_not_abs(self):
         "Test that a non-absolute path to gpg results in a full path"