diff --git a/possible-solution/client/package-lock.json b/possible-solution/client/package-lock.json
index 9d943ef..e21e875 100644
--- a/possible-solution/client/package-lock.json
+++ b/possible-solution/client/package-lock.json
@@ -8,7 +8,7 @@
 			"name": "client",
 			"version": "0.0.1",
 			"devDependencies": {
-				"@sveltejs/adapter-auto": "^4.0.0",
+				"@sveltejs/adapter-auto": "^7.0.1",
 				"@sveltejs/kit": "^2.17.1",
 				"svelte": "^5.19.10",
 				"svelte-check": "^4.1.4",
@@ -783,14 +783,11 @@
 			]
 		},
 		"node_modules/@sveltejs/adapter-auto": {
-			"version": "4.0.0",
-			"resolved": "https://registry.npmjs.org/@sveltejs/adapter-auto/-/adapter-auto-4.0.0.tgz",
-			"integrity": "sha512-kmuYSQdD2AwThymQF0haQhM8rE5rhutQXG4LNbnbShwhMO4qQGnKaaTy+88DuNSuoQDi58+thpq8XpHc1+oEKQ==",
+			"version": "7.0.1",
+			"resolved": "https://registry.npmjs.org/@sveltejs/adapter-auto/-/adapter-auto-7.0.1.tgz",
+			"integrity": "sha512-dvuPm1E7M9NI/+canIQ6KKQDU2AkEefEZ2Dp7cY6uKoPq9Z/PhOXABe526UdW2mN986gjVkuSLkOYIBnS/M2LQ==",
 			"dev": true,
 			"license": "MIT",
-			"dependencies": {
-				"import-meta-resolve": "^4.1.0"
-			},
 			"peerDependencies": {
 				"@sveltejs/kit": "^2.0.0"
 			}
diff --git a/possible-solution/client/package.json b/possible-solution/client/package.json
index c205637..23680c7 100644
--- a/possible-solution/client/package.json
+++ b/possible-solution/client/package.json
@@ -10,7 +10,7 @@
 		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch"
 	},
 	"devDependencies": {
-		"@sveltejs/adapter-auto": "^4.0.0",
+		"@sveltejs/adapter-auto": "^7.0.1",
 		"@sveltejs/kit": "^2.17.1",
 		"svelte": "^5.19.10",
 		"svelte-check": "^4.1.4",
diff --git a/possible-solution/server/test_app.py b/possible-solution/server/test_app.py
new file mode 100644
index 0000000..71bffd7
--- /dev/null
+++ b/possible-solution/server/test_app.py
@@ -0,0 +1,78 @@
+import importlib
+import io
+import os
+import sys
+import unittest
+from pathlib import Path
+from unittest.mock import patch
+
+
+SERVER_DIR = Path(__file__).parent
+
+
+class FakeModel:
+    def __init__(self):
+        self.inputs = None
+
+    def predict_proba(self, inputs):
+        self.inputs = inputs
+        return [FakePrediction()]
+
+
+class FakePrediction:
+    def __str__(self):
+        return "[0.25 0.75]"
+
+
+class AppRoutesTests(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.original_cwd = Path.cwd()
+        os.chdir(SERVER_DIR)
+        sys.path.insert(0, str(SERVER_DIR))
+        cls.model = FakeModel()
+
+        # Importing app loads the model at module scope. Keep this test
+        # independent of the binary model and its optional dependencies.
+        with patch("pickle.load", return_value=cls.model), patch(
+            "builtins.open", return_value=io.BytesIO()
+        ):
+            cls.app = importlib.import_module("app")
+
+        cls.client = cls.app.app.test_client()
+
+    @classmethod
+    def tearDownClass(cls):
+        os.chdir(cls.original_cwd)
+        sys.path.remove(str(SERVER_DIR))
+
+    def test_airports_returns_sorted_airports_with_numeric_ids(self):
+        response = self.client.get("/airports")
+
+        self.assertEqual(response.status_code, 200)
+        airports = response.get_json()
+        self.assertIsInstance(airports, list)
+        self.assertTrue(airports)
+        self.assertEqual(
+            airports,
+            sorted(airports, key=lambda airport: airport["name"]),
+        )
+        self.assertTrue(all(isinstance(airport["id"], int) for airport in airports))
+        self.assertTrue(all(set(airport) == {"id", "name"} for airport in airports))
+
+    def test_predict_converts_query_values_and_returns_probability_fields(self):
+        response = self.client.get("/predict?day_of_week=3&airport_id=14771")
+
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(self.model.inputs, [[3, 14771]])
+        self.assertEqual(response.get_json(), {"certainty": 0.25, "delay": 0.75})
+        self.assertEqual(response.headers["Access-Control-Allow-Origin"], "*")
+
+    def test_predict_rejects_missing_query_values(self):
+        response = self.client.get("/predict?day_of_week=3")
+
+        self.assertEqual(response.status_code, 500)
+
+
+if __name__ == "__main__":
+    unittest.main()