Fix missing subject (#16)

* Add missing subject to email (thx @indrif)

Author: indrif

src/mail_panel/backend.py

@@ -17,6 +17,7 @@ def __init__(self, message):
         message.message()  # triggers header validation
 
         super(MailToolbarBackendEmail, self).__init__(
+            subject=message.subject,
             to=message.to,
             cc=message.cc,
             bcc=message.bcc,

tests/test_toolbar.py

@@ -32,6 +32,7 @@ def setUp(self):
 
     @staticmethod
     def get_fake_message(
+            subject=None,
             to=None,
             cc=None,
             bcc=None,
@@ -42,6 +43,7 @@ def get_fake_message(
     ):
         # TODO Use Faker (https://github.com/joke2k/faker)
         return mail.EmailMultiAlternatives(
+            subject=subject or 'fake subject',
             to=to or ['[email protected]'],
             cc=cc or ['[email protected]'],
             bcc=bcc or ['[email protected]'],
@@ -73,6 +75,7 @@ def test_backend_email(self):
         message = MailToolbarBackendEmail(fake_message)
 
         # Check email fields
+        self.assertEqual(message.subject, fake_message.subject)
         self.assertEqual(message.to, fake_message.to)
         self.assertEqual(message.cc, fake_message.cc)
         self.assertEqual(message.bcc, fake_message.bcc)