ETSI TC INT has been working on a number of Conformance Test Suites for different Diameter interfaces: Rx, Gx ..
All of these standardized Diameter TTCN-3 test suites have been validated by ETSI members.
Diameter
Note that next to an Diameter implementation under test other TTCN-3 test system components, i.e., proper TTCN-3 codec, TTCN-3 SUT Adapter and a real time Platform Adapter, are needed in order to execute these test suites.