Add configuration tests.

* tests/test_config.py: New file.

Author: mbakke

tests/test_config.py

@@ -0,0 +1,34 @@
+import os
+import unittest
+import tomli
+
+import pytest
+from pydantic.error_wrappers import ValidationError
+
+import zabbix_auto_config.models as models
+
+class TestConfig(unittest.TestCase):
+    @staticmethod
+    def get_sample_config():
+        with open(os.path.dirname(os.path.dirname(__file__)) +
+                  "/config.sample.toml") as config:
+            return config.read()
+
+    def setUp(self):
+        self.sample_config = self.get_sample_config()
+
+    def test_sample_config(self):
+        models.Settings(**tomli.loads(self.sample_config))
+
+    def test_invalid_config(self):
+        config = tomli.loads(self.sample_config)
+        config["foo"] = "bar"
+        with pytest.raises(ValidationError) as exc_info:
+            models.Settings(**config)
+        assert exc_info.value.errors() == [{'loc': ('foo',),
+                                            'msg': 'extra fields not permitted',
+                                            'type': 'value_error.extra'}]
+
+
+if __name__ == "__main__":
+    unittest.main()