Add tests for GeoJSON validation

spec/factories/geo_area.rb

@@ -57,6 +57,22 @@ FactoryBot.define do
       end
     end
 
+    trait :invalid_right_hand_rule_polygon do
+      geometry do
+        {
+          "type": "Polygon",
+          "coordinates": [
+            [
+              [1.9116157293319704, 49.758172033960115],
+              [1.9116157293319704, 49.758172033960115],
+              [1.91162645816803, 49.75818243044436],
+              [1.9116157293319704, 49.758172033960115]
+            ]
+          ]
+        }
+      end
+    end
+
     trait :polygon_with_extra_coordinate do
       geometry do
         {

spec/models/geo_area_spec.rb

@@ -52,4 +52,32 @@ RSpec.describe GeoArea, type: :model do
       it { expect(geo_area.safe_geometry).to eq(polygon) }
     end
   end
+
+  describe '#valid?' do
+    let(:geo_area) { build(:geo_area, :polygon) }
+
+    context 'polygon' do
+      it { expect(geo_area.valid?).to be_truthy }
+    end
+
+    context 'hourglass_polygon' do
+      let(:geo_area) { build(:geo_area, :hourglass_polygon) }
+      it { expect(geo_area.valid?).to be_falsey }
+    end
+
+    context 'line_string' do
+      let(:geo_area) { build(:geo_area, :line_string) }
+      it { expect(geo_area.valid?).to be_truthy }
+    end
+
+    context 'point' do
+      let(:geo_area) { build(:geo_area, :point) }
+      it { expect(geo_area.valid?).to be_truthy }
+    end
+
+    context 'invalid_right_hand_rule_polygon' do
+      let(:geo_area) { build(:geo_area, :invalid_right_hand_rule_polygon) }
+      it { expect(geo_area.valid?).to be_falsey }
+    end
+  end
 end