Added limited flat roof insulaton

recommendations/RoofRecommendations.py

@@ -123,6 +123,7 @@ class RoofRecommendations:
         for material in materials:
 
             for depth, cost_per_unit in zip(material["depths"], material["cost"]):
+
                 # We make sure we hit a depth of 270mm. We should factor in any existing insulation if the
                 # loft is already partially insulated
                 if (depth + insulation_thickness) < self.MINIMUM_LOFT_ISULATION_MM:

recommendations/tests/test_roof_recommendations.py

@@ -55,7 +55,7 @@ flat_roof_insulation_materials = [
         'description': 'Example flat roof insulation',
         'depths': [50, 150, 220, 270, 300], 'depth_unit': 'mm', 'cost': [9, 10, 11, 12, 13],
         'cost_unit': 'gbp_sq_meter',
-        'r_value_per_mm': 0.022727273, 'r_value_unit': 'square_meter_kelvin_per_watt',
+        'r_value_per_mm': 0.032727273, 'r_value_unit': 'square_meter_kelvin_per_watt',
         'thermal_conductivity': 0.044, 'thermal_conductivity_unit': 'watt_per_meter_kelvin',
         'link': None, 'is_active': True
     }
@@ -343,11 +343,6 @@ class TestRoofRecommendations:
                "Insulate your room roof with 270mm of Example room roof insulation"
 
     def test_flat_no_insulation(self):
-        # Desriptions to handle:
-        # 'Flat, limited insulation (assumed)',
-        #
-        # 'Flat, insulated (assumed)'
-
         property_instance11 = Property(id=11, address1="fake", postcode="fake", epc_client=Mock())
         property_instance11.age_band = "D"
         property_instance11.floor_area = 150
@@ -405,3 +400,35 @@ class TestRoofRecommendations:
         roof_recommender12.recommend()
 
         assert not roof_recommender12.recommendations
+
+    def test_flat_limited_insulation(self):
+        property_instance13 = Property(id=12, address1="fake", postcode="fake", epc_client=Mock())
+        property_instance13.age_band = "D"
+        property_instance13.floor_area = 150
+        property_instance13.roof = {
+            'original_description': 'Flat, limited insulation (assumed)',
+            'clean_description': 'Flat, limited insulation',
+            'thermal_transmittance': None, 'thermal_transmittance_unit': None, 'is_pitched': False,
+            'is_roof_room': False,
+            'is_loft': False, 'is_flat': True, 'is_thatched': False, 'is_at_rafters': False, 'is_assumed': True,
+            'has_dwelling_above': False, 'is_valid': True, 'insulation_thickness': 'below average'
+        }
+
+        roof_recommender13 = RoofRecommendations(
+            property_instance=property_instance13, materials=flat_roof_insulation_materials
+        )
+
+        assert not roof_recommender13.recommendations
+
+        roof_recommender13.recommend()
+
+        assert len(roof_recommender13.recommendations) == 1
+
+        assert roof_recommender13.recommendations[0]["parts"][0]["depths"] == [220]
+
+        assert roof_recommender13.recommendations[0]["new_u_value"] == 0.14
+
+        assert roof_recommender13.recommendations[0]["starting_u_value"] == 2.3
+
+        assert roof_recommender13.recommendations[0]["description"] == \
+               "Insulate the home's flat roof with 220mm of Example flat roof insulation"