Allow instructeurs to download a GeoJSON document for a given dossier

spec/factories/geo_area.rb

@@ -1,8 +1,10 @@
 FactoryBot.define do
   factory :geo_area do
-    source { GeoArea.sources.fetch(:cadastre) }
-    numero { '42' }
-    feuille { 'A11' }
+    trait :cadastre do
+      source { GeoArea.sources.fetch(:cadastre) }
+      numero { '42' }
+      feuille { 'A11' }
+    end
 
     trait :quartier_prioritaire do
       source { GeoArea.sources.fetch(:quartier_prioritaire) }
@@ -13,5 +15,25 @@ FactoryBot.define do
     trait :selection_utilisateur do
       source { GeoArea.sources.fetch(:selection_utilisateur) }
     end
+
+    trait :polygon do
+      geometry do
+        {
+          "type": "Polygon",
+          "coordinates": [
+            [
+              [2.428439855575562, 46.538476837725796],
+              [2.4284291267395024, 46.53842148758162],
+              [2.4282521009445195, 46.53841410755813],
+              [2.42824137210846, 46.53847314771794],
+              [2.428284287452698, 46.53847314771794],
+              [2.428364753723145, 46.538487907747864],
+              [2.4284291267395024, 46.538491597754714],
+              [2.428439855575562, 46.538476837725796]
+            ]
+          ]
+        }
+      end
+    end
   end
 end