mock existence of default admin set in spec

Author: bkiahstroud

spec/requests/work_depositor_role_spec.rb

@@ -73,6 +73,7 @@
     end
 
     it 'can see the work form' do
+      allow(AdminSet).to receive(:first).and_return(OpenStruct.new(id: 'admin_set/default'))
       get new_hyrax_generic_work_path
 
       expect(response).to have_http_status(:success)