Software testing in an ERP system like SAP would span several categories; from testing of the actual product (done by the vendor, SAP) to testing of individual customer developments (done by the developers/development coordinators within the actual client company). Not sure what you're thinking of here, but yes, SAP has it's own suite of testing tools; predominantly eCatt (Computer-aided testing tool), allowing to device and test a wide range of scenarios for specific developments. Check SAP documentation (search for eCatt) for more details.
