diff --git a/spec/controllers/champs/carte_controller_spec.rb b/spec/controllers/champs/carte_controller_spec.rb
new file mode 100644
index 000000000..fadf1fa1a
--- /dev/null
+++ b/spec/controllers/champs/carte_controller_spec.rb
@@ -0,0 +1,51 @@
+require 'spec_helper'
+
+describe Champs::CarteController, type: :controller do
+  let(:user) { create(:user) }
+  let(:procedure) { create(:procedure, :published) }
+  let(:dossier) { create(:dossier, user: user, procedure: procedure) }
+  let(:params) do
+    {
+      dossier: {
+        champs_attributes: {
+          '1' => { value: selection.to_json }
+        }
+      },
+      position: '1',
+      champ_id: champ.id
+    }
+  end
+  let(:champ) do
+    create(:type_de_champ_carte, options: {
+      quartiers_prioritaires: true
+    }).champ.create(dossier: dossier)
+  end
+
+  describe 'POST #show' do
+    render_views
+
+    before { sign_in user }
+    before do
+      allow_any_instance_of(ApiCarto::QuartiersPrioritairesAdapter)
+        .to receive(:results)
+        .and_return([{ code: "QPCODE1234", geometry: { type: "MultiPolygon", coordinates: [[[[2.38715792094576, 48.8723062632126], [2.38724851642619, 48.8721392348061]]]] } }])
+
+      post :show, params: params, format: 'js'
+    end
+
+    context 'when coordinates are empty' do
+      let(:selection) { [] }
+
+      it { expect(response.body).to include("DS.drawMapData(\".carte-1\", {\"position\":{\"lon\":\"2.428462\",\"lat\":\"46.538192\",\"zoom\":\"13\"},\"selection\":[],\"quartiersPrioritaires\":[],\"cadastres\":[]});") }
+    end
+
+    context 'when coordinates are informed' do
+      let(:selection) { [[{ "lat": 48.87442541960633, "lng": 2.3859214782714844 }, { "lat": 48.87273183590832, "lng": 2.3850631713867183 }, { "lat": 48.87081237174292, "lng": 2.3809432983398438 }, { "lat": 48.8712640169951, "lng": 2.377510070800781 }, { "lat": 48.87510283703279, "lng": 2.3778533935546875 }, { "lat": 48.87544154230615, "lng": 2.382831573486328 }, { "lat": 48.87442541960633, "lng": 2.3859214782714844 }]] }
+
+      it { expect(response.body).not_to be_nil }
+      it { expect(response.body).to include('QPCODE1234') }
+      it { expect(response.body).to include('MultiPolygon') }
+      it { expect(response.body).to include('[2.38715792094576,48.8723062632126]') }
+    end
+  end
+end