Optional path argument and corresponding test

app/jobs/moab_to_catalog_job.rb

@@ -11,8 +11,9 @@ class MoabToCatalogJob < ApplicationJob
 
   # @param [MoabStorageRoot] root mount containing the Moab
   # @param [String] druid
-  # @param [String] path
-  def perform(root, druid, path)
+  # @param [String] optional path
+  def perform(root, druid, path=nil)
+    path = "#{root.storage_location}/#{DruidTools::Druid.new(druid).tree.join('/')}" if path? nil
     moab = Moab::StorageObject.new(druid, path)
     PreservedObjectHandler.new(druid, moab.current_version_id, moab.size, root).check_existence
   end

spec/jobs/moab_to_catalog_job_spec.rb

@@ -20,4 +20,18 @@
       job.perform(msr, druid, path)
     end
   end
+
+  describe '#perform without path' do
+    let(:msr) { create :moab_storage_root }
+    let(:path) { 'spec/fixtures/moab_storage_root01/sdr2objects/bj/102/hs/9687/bj102hs9687' }
+    let(:handler) { instance_double(PreservedObjectHandler) }
+
+    it 'builds a PreservedObjectHandler from MoabStorageRoot and druid if path is missing' do
+      expect(Moab::StorageObject).to receive(:new).with(druid, path).and_return(moab)
+      expect(PreservedObjectHandler).to receive(:new)
+        .with(druid, moab.current_version_id, moab.size, msr).and_return(handler)
+      expect(handler).to receive(:check_existence)
+      job.perform(msr, druid)
+    end
+  end
 end