Add lettings allocation field to import field rake task

lib/tasks/data_import_field.rake

@@ -9,7 +9,7 @@ namespace :core do
 
     # We only allow a reduced list of known fields to be updatable
     case field
-    when "tenant_code", "major_repairs"
+    when "tenant_code", "major_repairs", "lettings_allocation"
       Imports::CaseLogsFieldImportService.new(storage_service).update_field(field, path)
     else
       raise "Field #{field} cannot be updated by data_import_field"

spec/lib/tasks/date_import_field_spec.rb

@@ -42,6 +42,20 @@ describe "rake core:data_import_field", type: :task do
       end
     end
 
+    context "and we update the lettings_allocation fields" do
+      let(:field) { "lettings_allocation" }
+
+      it "properly configures the storage service" do
+        expect(StorageService).to receive(:new).with(paas_config_service, instance_name)
+        task.invoke(field, fixture_path)
+      end
+
+      it "calls the expected update method with parameters" do
+        expect(import_service).to receive(:update_field).with(field, fixture_path)
+        task.invoke(field, fixture_path)
+      end
+    end
+
     context "and we update the major repairs fields" do
       let(:field) { "major_repairs" }