Adding more simulation tests

tests/test_simulations.py

 """Live integration tests for SimStadt workflows. Skipped if SimStadt is not installed."""
 
 from pathlib import Path
+import rich
 
 import pytest
 
@@ -29,9 +30,14 @@ def test_heat_demand():
 
     assert "Heated area" in kpis
     assert "Yearly Heating demand" in kpis
-    # TODO: More detailed tests
     assert kpis["Yearly Heating demand"].value > 0
-    assert kpis["Heated area"].value > 0
+    assert kpis["Yearly Heating demand"].unit == "kWh / a"
+    assert kpis["Specific Heating Demand"].value == pytest.approx(100, abs=30)
+    assert kpis["Specific Heating Demand"].unit == "kWh / (m² · a)"
+    assert kpis["Mean Uvalue"].value == pytest.approx(1, abs=0.2)
+    assert kpis["Mean Uvalue"].unit == "W / (m² · K)"
+    assert kpis["Year of construction"].value == pytest.approx(1950, abs=50)
+    assert kpis["Year of construction"].unit == None
 
 
 @pytest.mark.integration
@@ -43,6 +49,7 @@ def test_pv():
         description="PV – MiniBuchwald",
     )
     kpis = to_dict(results.kpis)
+    rich.print(kpis)
 
     assert "PV potential yield" in kpis
     assert "Roof area for PV" in kpis
@@ -59,6 +66,7 @@ def test_load_profile():
         description="Load profile – MiniBuchwald",
     )
     kpis = to_dict(results.kpis)
+    rich.print(kpis)
 
     assert "Number of buildings" in kpis
     assert "Total load [MWh]" in kpis or any("load" in k.lower() for k in kpis)