diff --git a/.gitignore b/.gitignore
index 9bbe995..ba9b650 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,4 +14,9 @@ config.ini
 *.pem
 
 # nix
-result
\ No newline at end of file
+result
+
+# python
+*.pyc
+__pycache__
+.coverage
\ No newline at end of file
diff --git a/default.nix b/default.nix
index 05aa0d8..59ce8f2 100644
--- a/default.nix
+++ b/default.nix
@@ -19,7 +19,7 @@ pkgs.python3Packages.buildPythonPackage rec {
     cryptography
   ];
 
-  # nativeCheckInputs = [ pkgs.python3Packages.pytestCheckHook ];
+  nativeCheckInputs = [ pkgs.python3Packages.pytestCheckHook ];
   pythonImportsCheck = [ "smtprd_ng" ];
 
   meta = {
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_smtprd_ng.py b/tests/test_smtprd_ng.py
new file mode 100644
index 0000000..ceb5486
--- /dev/null
+++ b/tests/test_smtprd_ng.py
@@ -0,0 +1,46 @@
+#     SMTP forwarding relay daemon with signing and encryption
+#
+#     Copyright (C) 2024  F. Brandes (additions to original code)
+#
+#     This program is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU Affero General Public License as
+#     published by the Free Software Foundation, either version 3 of the
+#     License, or (at your option) any later version.
+#
+#     This program is distributed in the hope that it will be useful,
+#     but WITHOUT ANY WARRANTY; without even the implied warranty of
+#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#     GNU Affero General Public License for more details.
+#
+#     You should have received a copy of the GNU Affero General Public License
+#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+Tests for smtprd_ng
+"""
+# pylint: disable=protected-access
+
+import configparser
+from pathlib import Path
+
+from smtprd_ng import smtprd
+
+
+def test_config_from_config():
+    """Test opening and readig the config file"""
+    config_parser: configparser.ConfigParser = configparser.ConfigParser()
+    with open(Path("config.example"), "r", encoding="utf8") as fp:
+        config_parser.read_file(fp)
+    cfg = smtprd.Config._from_config(config_parser)
+    assert cfg.server.hostname == "localhost"
+    assert cfg.client.port == 465
+    assert cfg.client.smime_cert == ""
+
+
+def test_config_from_ini():
+    """Test parsing the config file and using fallbacks"""
+    cfg = smtprd.Config.from_ini(Path("config.example"))
+    assert cfg.server.hostname == "localhost"
+    assert cfg.client.port == 465
+    assert cfg.client.smime_cert == ""
+    assert cfg.client.use_tls is True