Add test for sending email while service restricted

tests/app/celery/test_tasks.py

@@ -400,6 +400,32 @@ def test_should_send_email_if_restricted_service_and_valid_email(notify_db, noti
     )
 
 
+def test_should_not_send_email_if_restricted_service_and_invalid_email_address(notify_db, notify_db_session, mocker):
+    user = sample_user(notify_db, notify_db_session)
+    service = sample_service(notify_db, notify_db_session, user=user, restricted=True)
+    template = sample_template(
+        notify_db, notify_db_session, service=service, template_type='email', subject_line='Hello'
+    )
+
+    notification = {
+        "template": template.id,
+        "to": "test@example.com"
+    }
+    mocker.patch('app.encryption.decrypt', return_value=notification)
+    mocker.patch('app.aws_ses_client.send_email')
+
+    notification_id = uuid.uuid4()
+    now = datetime.utcnow()
+    send_sms(
+        service.id,
+        notification_id,
+        "encrypted-in-reality",
+        now.strftime(DATETIME_FORMAT)
+    )
+
+    aws_ses_client.send_email.assert_not_called()
+
+
 def test_should_send_template_to_correct_sms_provider_and_persist_with_job_id(sample_job, mocker):
     notification = {
         "template": sample_job.template.id,