Setup a test order cycle with its exchanges

spec/serializers/api/cached_enterprise_serializer_spec.rb

@@ -23,4 +23,37 @@ describe Api::CachedEnterpriseSerializer do
       expect(properties).to eq([property, different_property])
     end
   end
+
+  describe '#distributed_properties' do
+    let(:cached_enterprise_serializer) { described_class.new(shop, options) }
+
+    let(:enterprise_injection_data) do
+      instance_double(OpenFoodNetwork::EnterpriseInjectionData, active_distributors: [])
+    end
+    let(:options) { { data: enterprise_injection_data } }
+    let(:shop) { create(:distributor_enterprise, name: 'Distributor') }
+
+    let(:property) { create(:property, presentation: 'One') }
+
+    before do
+      producer = create(:supplier_enterprise, name: 'Supplier')
+      product = create(:product, supplier: producer, properties: [property])
+
+      order_cycle = build(:simple_order_cycle, coordinator: shop)
+
+      incoming_exchange = build(:exchange, sender: producer, receiver: shop, incoming: true)
+      outgoing_exchange = build(:exchange, sender: shop, receiver: shop, incoming: false)
+      outgoing_exchange.variants << product.variants.first
+
+      order_cycle.exchanges << incoming_exchange
+      order_cycle.exchanges << outgoing_exchange
+
+      order_cycle.save
+    end
+
+    it 'does not duplicate properties' do
+      properties = cached_enterprise_serializer.distributed_properties
+      expect(properties).to eq([property])
+    end
+  end
 end