test: update tests

app/services/imports/scheme_import_service.rb

@@ -49,12 +49,6 @@ module Imports
       attributes["arrangement_type"] = string_or_nil(xml_doc, "arrangement_type")
       attributes["owning_org_old_id"] = string_or_nil(xml_doc, "institution")
       attributes["owning_organisation_id"] = find_owning_organisation_id(attributes["owning_org_old_id"])
-      attributes["management_org_old_visible_id"] = safe_string_as_integer(xml_doc, "agent")
-      attributes["managing_organisation_id"] = find_managing_organisation_id(attributes["management_org_old_visible_id"])
-
-      if attributes["arrangement_type"] == "D" && attributes["managing_organisation_id"].nil?
-        attributes["managing_organisation_id"] = attributes["owning_organisation_id"]
-      end
 
       attributes
     end
@@ -65,14 +59,5 @@ module Imports
 
       organisation.id
     end
-
-    def find_managing_organisation_id(old_visible_id)
-      return unless old_visible_id
-
-      organisation = Organisation.find_by(old_visible_id:)
-      raise "Organisation not found with legacy visible ID #{old_visible_id}" if organisation.nil?
-
-      organisation.id
-    end
   end
 end