chore: add base config and package structure

tests/test_config_and_structure.py

@@ -0,0 +1,43 @@
+import importlib
+import unittest
+from unittest.mock import patch
+
+from app import create_app
+
+
+class ConfigAndStructureTest(unittest.TestCase):
+    def test_create_app_loads_environment_config(self):
+        env = {
+            "CHIS_BASE_URL": "http://chis.example.test/chis",
+            "CHIS_PUBLIC_KEY": "PUBLIC_KEY_PLACEHOLDER",
+            "REDIS_URL": "redis://localhost:6379/0",
+            "LOG_DIR": "logs",
+            "ARCHIVE_DIR": "archives",
+        }
+
+        with patch.dict("os.environ", env, clear=False):
+            app = create_app({"TESTING": True})
+
+        self.assertEqual(app.config["CHIS_BASE_URL"], env["CHIS_BASE_URL"])
+        self.assertEqual(app.config["CHIS_PUBLIC_KEY"], env["CHIS_PUBLIC_KEY"])
+        self.assertEqual(app.config["REDIS_URL"], env["REDIS_URL"])
+        self.assertEqual(app.config["LOG_DIR"], env["LOG_DIR"])
+        self.assertEqual(app.config["ARCHIVE_DIR"], env["ARCHIVE_DIR"])
+
+    def test_architecture_packages_are_importable(self):
+        package_names = [
+            "app.middleware",
+            "app.services",
+            "app.mappers",
+            "app.chis",
+            "app.repositories",
+            "app.validators",
+        ]
+
+        for package_name in package_names:
+            with self.subTest(package_name=package_name):
+                self.assertIsNotNone(importlib.import_module(package_name))
+
+
+if __name__ == "__main__":
+    unittest.main()