add only_active flag to GET /services/

does what it says on the tin

tests/app/conftest.py

@@ -129,6 +129,7 @@ def sample_service(notify_db,
                    notify_db_session,
                    service_name="Sample service",
                    user=None,
+                   active=True,
                    restricted=False,
                    limit=1000,
                    email_from=None):
@@ -139,7 +140,7 @@ def sample_service(notify_db,
     data = {
         'name': service_name,
         'message_limit': limit,
-        'active': True,
+        'active': active,
         'restricted': restricted,
         'email_from': email_from,
         'created_by': user

tests/app/service/test_rest.py

@@ -38,6 +38,23 @@ def test_get_service_list(notify_api, service_factory):
             assert json_resp['data'][2]['name'] == 'three'
 
 
+def test_get_service_list_with_only_active_flag(client, service_factory):
+    inactive = service_factory.get('one', email_from='one')
+    active = service_factory.get('two', email_from='two')
+
+    inactive.active = False
+
+    auth_header = create_authorization_header()
+    response = client.get(
+        '/service?only_active=True',
+        headers=[auth_header]
+    )
+    assert response.status_code == 200
+    json_resp = json.loads(response.get_data(as_text=True))
+    assert len(json_resp['data']) == 1
+    assert json_resp['data'][0]['id'] == str(active.id)
+
+
 def test_get_service_list_by_user(notify_db, notify_db_session, client, sample_user, service_factory):
     other_user = create_sample_user(notify_db, notify_db_session, email='foo@bar.gov.uk')
     service_factory.get('one', sample_user, email_from='one')