Add test for In-Reply-To

1 files changed, 15 insertions, 0 deletions

diff --git a/distixlib/msg_id_extractor_tests.py b/distixlib/msg_id_extractor_tests.py
index 0b5c82a..74a4886 100644
--- a/distixlib/msg_id_extractor_tests.py
+++ b/distixlib/msg_id_extractor_tests.py
@@ -63,3 +63,18 @@ Wherefore art thou?
         self.assertEqual(
             distixlib.get_ids_from_message(msg),
             set(['capulet123@verona', 'capulet456@verona']))
+
+    def test_returns_ids_from_in_reply_to(self):
+        msg_text = '''\
+From: user@example.com
+To: other@example.com
+Subject: O, Romeo
+In-Reply-To: <capulet123@verona>,  <capulet456@verona>
+
+Wherefore art thou?
+'''
+
+        msg = email.message_from_string(msg_text)
+        self.assertEqual(
+            distixlib.get_ids_from_message(msg),
+            set(['capulet123@verona', 'capulet456@verona']))