Add spec for SuppliedProduct serializer

engines/dfc_provider/app/serializers/dfc_provider/enterprise_serializer.rb

@@ -18,7 +18,7 @@ module DfcProvider
     def id
       dfc_provider_routes.api_dfc_provider_enterprise_url(
         id: object.id,
-        host: root_url
+        host: host
       )
     end
 

engines/dfc_provider/app/serializers/dfc_provider/person_serializer.rb

@@ -28,7 +28,7 @@ module DfcProvider
     def id
       dfc_provider_routes.api_dfc_provider_person_url(
         id: object.id,
-        host: root_url
+        host: host
       )
     end
 

engines/dfc_provider/app/serializers/dfc_provider/supplied_product_serializer.rb

@@ -20,7 +20,7 @@ module DfcProvider
       dfc_provider_routes.api_dfc_provider_enterprise_supplied_product_url(
         enterprise_id: object.product.supplier_id,
         id: object.id,
-        host: root_url
+        host: host
       )
     end
 

engines/dfc_provider/spec/serializers/dfc_provider/supplied_product_serializer_spec.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe DfcProvider::SuppliedProductSerializer do
+  let!(:product) { create(:simple_product ) }
+  let!(:variant) { product.variants.first }
+
+  subject { described_class.new(variant) }
+
+  describe '#id' do
+    it 'returns the expected value' do
+      expect(subject.id).to eq(
+        DfcProvider::Engine.routes.url_helpers.api_dfc_provider_enterprise_supplied_product_url(
+          enterprise_id: product.supplier_id,
+          id: variant.id,
+          host: 'http://test.host'
+        )
+      )
+    end
+  end
+
+  describe '#unit' do
+    it 'returns the rdfs label value' do
+      expect(subject.unit).to eq(
+        {
+          '@id' => '/unit/piece',
+          'rdfs:label' => 'piece'
+        }
+      )
+    end
+  end
+end