Add dao to delete inbound sms after seven days

tests/app/dao/test_inbound_sms_dao.py

@@ -1,11 +1,16 @@
-from datetime import datetime
+from datetime import datetime, timedelta
 
 from freezegun import freeze_time
 
-from app.dao.inbound_sms_dao import dao_get_inbound_sms_for_service, dao_count_inbound_sms_for_service
-
+from app.dao.inbound_sms_dao import (
+    dao_get_inbound_sms_for_service,
+    dao_count_inbound_sms_for_service,
+    delete_inbound_sms_created_more_than_a_week_ago
+)
 from tests.app.db import create_inbound_sms, create_service
 
+from app.models import InboundSms
+
 
 def test_get_all_inbound_sms(sample_service):
     inbound = create_inbound_sms(sample_service)
@@ -57,3 +62,27 @@ def test_count_inbound_sms_for_service(notify_db_session):
     create_inbound_sms(service_two)
 
     assert dao_count_inbound_sms_for_service(service_one.id) == 2
+
+
+@freeze_time("2017-01-01 12:00:00")
+def test_should_delete_inbound_sms_older_than_seven_days(sample_service):
+    older_than_seven_days = datetime.utcnow() - timedelta(days=7, seconds=1)
+    create_inbound_sms(sample_service, created_at=older_than_seven_days)
+    delete_inbound_sms_created_more_than_a_week_ago()
+
+    assert len(InboundSms.query.all()) == 0
+
+
+@freeze_time("2017-01-01 12:00:00")
+def test_should_not_delete_inbound_sms_before_seven_days(sample_service):
+    yesterday = datetime.utcnow() - timedelta(days=1)
+    just_before_seven_days = datetime.utcnow() - timedelta(days=6, hours=23, minutes=59, seconds=59)
+    older_than_seven_days = datetime.utcnow() - timedelta(days=7, seconds=1)
+
+    create_inbound_sms(sample_service, created_at=yesterday)
+    create_inbound_sms(sample_service, created_at=just_before_seven_days)
+    create_inbound_sms(sample_service, created_at=older_than_seven_days)
+
+    delete_inbound_sms_created_more_than_a_week_ago()
+
+    assert len(InboundSms.query.all()) == 2