'Specifying \'Reply-To\' in headers should override reply_to.'

def test_reply_to_header(self):

    email = EmailMessage('Subject', 'Content', 'bounce@example.com', ['to@example.com'], reply_to=['foo@example.com'], headers={'Reply-To': 'override@example.com'})
    message = email.message()
    self.assertEqual(message['Reply-To'], 'override@example.com')
