Add failing transcoding test

An attachment with Content-Type application/octet is transcoded to
utf-8, originally the attachment is in latin1 (although that doen't
matter, no charset can be asumed for a binary-only attachment).

Author: schlatterbeck

test/test_mailgw.py

@@ -668,6 +668,35 @@ def testNewIssueNoAuthorEmail(self):
 _______________________________________________________________________
 ''')
 
+    octetstream_msg = '''From: mary <[email protected]>
+To: [email protected]
+Message-Id: <followup_dummy_id>
+In-Reply-To: <dummy_test_message_id>
+Subject: [issue1] Testing...
+Content-Type: multipart/mixed; boundary="uh56ypi7view24rr"
+Content-Disposition: inline
+
+--uh56ypi7view24rr
+Content-Type: text/plain; charset=us-ascii
+Content-Disposition: inline
+
+Attach a file with non-ascii characters in it (encoded latin-1 should
+make it as-is through roundup due to Content-Type
+application/octet-stream)
+-- 
+Ralf Schlatterbeck             email: [email protected]
+
+--uh56ypi7view24rr
+Content-Type: application/octet-stream
+Content-Disposition: attachment; filename=testfile
+Content-Transfer-Encoding: quoted-printable
+
+This is a file containing text
+in latin-1 format =E4=F6=FC=C4=D6=DC=DF
+
+--uh56ypi7view24rr--
+'''
+
     multipart_msg = '''From: mary <[email protected]>
 To: [email protected]
 Message-Id: <followup_dummy_id>
@@ -803,6 +832,22 @@ def testNewIssueNoAuthorEmail(self):
 --001485f339f8f361fb049188dbba--
 '''
 
+    def testOctetStreamTranscoding(self):
+        self.doNewIssue()
+        self._handle_mail(self.octetstream_msg)
+        messages = self.db.issue.get('1', 'messages')
+        messages.sort()
+        msg = self.db.msg.getnode (messages[-1])
+        assert(len(msg.files) == 1)
+        names = {0 : 'testfile'}
+        content = ['''This is a file containing text
+in latin-1 format \xE4\xF6\xFC\xC4\xD6\xDC\xDF
+''']
+        for n, id in enumerate (msg.files):
+            f = self.db.file.getnode (id)
+            self.assertEqual(f.name, names.get (n, 'unnamed'))
+            self.assertEqual(f.content, content [n])
+
     def testMultipartKeepAlternatives(self):
         self.doNewIssue()
         self._handle_mail(self.multipart_msg)