Expose the descriptive metadata as an endpoint

This will be consumed by common-accessioning and argo.
We can then move that class to dor-services from dor-services-app

.rubocop_todo.yml

@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2019-05-01 10:13:09 -0500 using RuboCop version 0.65.0.
+# on 2019-05-01 14:31:04 -0500 using RuboCop version 0.65.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new

app/controllers/metadata_controller.rb

@@ -8,4 +8,9 @@ def dublin_core
     service = DublinCoreService.new(@item)
     render xml: service
   end
+
+  def descriptive
+    service = Dor::PublicDescMetadataService.new(@item)
+    render xml: service
+  end
 end

config/routes.rb

@@ -42,6 +42,7 @@
       resources :metadata, only: [] do
         collection do
           get 'dublin_core'
+          get 'descriptive'
         end
       end
 

spec/requests/metadata_spec.rb

@@ -2,7 +2,7 @@
 
 require 'rails_helper'
 
-RSpec.describe 'Refresh metadata' do
+RSpec.describe 'Display metadata' do
   let(:user) { Settings.DOR.SERVICE_USER }
   let(:password) { Settings.DOR.SERVICE_PASSWORD }
   let(:basic_auth) { ActionController::HttpAuthentication::Basic.encode_credentials(user, password) }
@@ -13,10 +13,27 @@
     allow(Dor).to receive(:find).and_return(object)
   end
 
-  it 'returns the DC xml' do
-    get '/v1/objects/druid:mk420bs7601/metadata/dublin_core',
-        headers: { 'Authorization' => basic_auth }
-    expect(response).to be_successful
-    expect(response.body).to include '<dc:title>Hello</dc:title>'
+  describe 'dublin core' do
+    it 'returns the DC xml' do
+      get '/v1/objects/druid:mk420bs7601/metadata/dublin_core',
+          headers: { 'Authorization' => basic_auth }
+      expect(response).to be_successful
+      expect(response.body).to include '<dc:title>Hello</dc:title>'
+    end
+  end
+
+  describe 'descriptive' do
+    it 'returns the DC xml' do
+      get '/v1/objects/druid:mk420bs7601/metadata/descriptive',
+          headers: { 'Authorization' => basic_auth }
+      expect(response).to be_successful
+      expect(response.body).to be_equivalent_to <<~XML
+        <mods xmlns="http://www.loc.gov/mods/v3" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="3.6" xsi:schemaLocation="http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-6.xsd">
+          <titleInfo>
+            <title>Hello</title>
+          </titleInfo>
+        </mods>
+      XML
+    end
   end
 end