Home Learning Center Loan Delivery Test Environment Learning Center Loan Delivery Test Environment Learning Center Fannie Mae-delivering lenders can use the Loan Delivery Test Environment (LDTE) to test their production-ready Uniform Loan Delivery Dataset (ULDD) data. Job Aids Loan Delivery Test Environment Online Learning Loan Delivery Quick Start for Whole Loans Other Resources Test Case Scenarios Fannie Mae Test Cases (Excel) Appendix B DU and Appraisal Doc File ID Test Case Scenarios DU Test Files