Add NotificationSender, one test

atst/utils/notification_sender.py

@@ -0,0 +1,20 @@
+from atst.queue import ATSTQueue
+from atst.database import db
+from atst.models import NotificationRecipient
+
+
+class NotificationSender(object):
+    EMAIL_SUBJECT = "ATST notification"
+
+    def __init__(self, queue: ATSTQueue):
+        self.queue = queue
+
+    def send(self, body, type_=None):
+        recipients = self._get_recipients(type_)
+        self.queue.send_mail(recipients, self.EMAIL_SUBJECT, body)
+
+    def _get_recipients(self, type_):
+        return [
+            recipient.email
+            for recipient in db.session.query(NotificationRecipient).all()
+        ]