add test test_unknown_cte_value

that tests if a message with unknown content-transfer-encoding header,
but otherwise correct ascii encoded payload, is warned about.

2 files changed, 21 insertions, 0 deletions

diff --git a/tests/db/utils_test.py b/tests/db/utils_test.py
index 160ef453..6656aae5 100644
--- a/tests/db/utils_test.py
+++ b/tests/db/utils_test.py
@@ -750,3 +750,15 @@ class TestRemoveCte(unittest.TestCase):
         # We expect no Exceptions but a complaint in the log
         logmsg = 'INFO:root:Unknown Content-Transfer-Encoding: "7bit;"'
         self.assertEqual(cm.output, [logmsg])
+
+    def test_unknown_cte_value(self):
+        with open('tests/static/mail/malformed-header-CTE-2.eml') as fp:
+            mail = email.message_from_file(fp)
+
+        with self.assertLogs(level='DEBUG') as cm:  # keep logs
+            utils.remove_cte(mail, as_string=True)
+
+        # We expect no Exceptions but a complaint in the log
+        logmsg = 'DEBUG:root:failed to interpret Content-Transfer-Encoding: '\
+                 '"normal"'
+        self.assertIn(logmsg, cm.output)
diff --git a/tests/static/mail/malformed-header-CTE-2.eml b/tests/static/mail/malformed-header-CTE-2.eml
new file mode 100644
index 00000000..898cf2ec
--- /dev/null
+++ b/tests/static/mail/malformed-header-CTE-2.eml
@@ -0,0 +1,9 @@
+Subject: malformed Content-Transfer-Encoding v2
+To: lucc@github
+From: test@alot
+MIME-Version: 1.0;
+Content-Type: text/plain; charset=iso-8859-1;
+Content-Transfer-Encoding: normal
+
+This message contains an invalid header value for the "Content-Transfer-Encoding":
+issue #1301