Add tests for account ACL model

Add string repr to account ACL model

tests/test_database_account_acl.py

@@ -0,0 +1,12 @@
+import json
+
+import peewee
+from fixtures import demo_database
+
+from keyosk import database
+
+
+def test_formatting(demo_database):
+    for acl in database.AccountACLEntry.select():
+        assert dict(acl) == json.loads(json.dumps(dict(acl)))
+        assert str(acl.uuid) not in str(acl)