Add tests

tests/test_mail.py

@@ -0,0 +1,11 @@
+#!/usr/bin/python
+# -*- coding: UTF-8 -*-
+
+import pytest
+from stacosys.service import mailer
+
+def test_configure_and_check():
+	mailer.configure_smtp("localhost", 2525, "admin", "admin")
+	mailer.configure_destination("admin@mydomain.com")
+	with pytest.raises(ConnectionRefusedError):
+		mailer.check()