This project contains clasess to create a SMP Client based on the BDXL and SMP specifications developed by the OASIS BDXR Technical Committee and its predecessors developed within PEPPOL.
It actually is the Hex representation of the hash, so the most complete name here would even be MD5_HASH_HEX :-)
But as its just in a test class and the meaning still clear this change is also low prio.
Since that is what it actually is... ;-)
https://github.com/holodeck-b2b/bdxr-common/blob/821cd50d99b2f144bcb31b23b59b4c12e25a7b52/generic-client/src/test/java/org/holodeckb2b/bdxr/sml/PEPPOLHostNameGeneratorTest.java#L34