add updated_at to provider_details

it's set to utcnow from dao_update_provider_details

tests/app/dao/test_provider_details_dao.py

@@ -1,3 +1,7 @@
+from datetime import datetime
+
+from freezegun import freeze_time
+
 from app.models import ProviderDetails, ProviderDetailsHistory
 from app import clients
 from app.dao.provider_details_dao import (
@@ -45,18 +49,21 @@ def test_should_not_error_if_any_provider_in_code_not_in_database(restore_provid
     assert clients.get_sms_client('mmg')
 
 
+@freeze_time('2000-01-01T00:00:00')
 def test_update_adds_history(restore_provider_details):
     ses = ProviderDetails.query.filter(ProviderDetails.identifier == 'ses').one()
     ses_history = ProviderDetailsHistory.query.filter(ProviderDetailsHistory.id == ses.id).one()
 
     assert ses.version == 1
     assert ses_history.version == 1
+    assert ses.updated_at is None
 
     ses.active = False
 
     dao_update_provider_details(ses)
 
     assert not ses.active
+    assert ses.updated_at == datetime(2000, 1, 1, 0, 0, 0)
 
     ses_history = ProviderDetailsHistory.query.filter(
         ProviderDetailsHistory.id == ses.id
@@ -66,6 +73,8 @@ def test_update_adds_history(restore_provider_details):
 
     assert ses_history[0].active
     assert ses_history[0].version == 1
+    assert ses_history[0].updated_at is None
 
     assert not ses_history[1].active
     assert ses_history[1].version == 2
+    assert ses_history[1].updated_at == datetime(2000, 1, 1, 0, 0, 0)

tests/app/provider_details/test_rest.py

@@ -43,7 +43,9 @@ def test_get_provider_details_contains_correct_fields(client, notify_db):
         headers=[create_authorization_header()]
     )
     json_resp = json.loads(response.get_data(as_text=True))['provider_details']
-    allowed_keys = {"id", "display_name", "identifier", "priority", 'notification_type', "active", "version"}
+    allowed_keys = {
+        "id", "display_name", "identifier", "priority", 'notification_type', "active", "version", "updated_at"
+    }
     assert allowed_keys == set(json_resp[0].keys())
 
 
@@ -81,7 +83,11 @@ def test_should_be_able_to_update_status(client, restore_provider_details):
     assert not provider.active
 
 
-@pytest.mark.parametrize('field,value', [('identifier', 'new'), ('version', 7)])
+@pytest.mark.parametrize('field,value', [
+    ('identifier', 'new'),
+    ('version', 7),
+    ('updated_at', None)
+])
 def test_should_not_be_able_to_update_disallowed_fields(client, restore_provider_details, field, value):
     provider = ProviderDetails.query.first()