def test_message_selection(self):
# Create new message from another author
other_message = Message(user=self.users[1], text='Another message')
other_message.save()
message = Message(user=self.author, text='s/nothing/todo')
modified = message.substitute()
self.assertEqual(modified.user, self.author)
self.assertEqual(modified.text, 'Hello World!')
# Remove the other message
other_message.delete()
