WIP before rebase

tests/test_app.py

@@ -3,26 +3,13 @@ sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
 
 import app
 
-
-def test_chat_function_exists():
-    """Check that the app has a chat() function."""
-    assert hasattr(app, "chat")
-    assert callable(app.chat)
-
-
-def test_chat_returns_string():
-    """chat() should return a non-empty string for minimal input."""
-    result = app.chat(
-        messages="I'm buying a bottle of water.",
-        history=[],
-        car_km=0,
-        bus_km=0,
-        train_km=0,
-        air_km_month=0,
-        meat_meals=0,
-        vegetarian_meals=0,
-        vegan_meals=0,
+def test_calculate_footprint():
+    """Check CO2 footprint calculation."""
+    total, stats = app.calculate_footprint(
+        car_km=10, bus_km=5, train_km=2, air_km_week=50,
+        meat_meals=3, vegetarian_meals=2, vegan_meals=1,
     )
 
-    assert isinstance(result, str)
-    assert len(result) > 0
+    assert total > 0
+    assert "trees" in stats
+    assert isinstance(stats["trees"], int)