In re-running all our tests in Eclipse I have noticed the oddly-named directory '${sys:stardog.home}' being created whenever one of the tests runs, in the Eclipse workspace where the test was invoked.
It always contains the two files stardog.log and zookeeper.log, both of which are empty. Example:
[conradL@qimr13054 groovy]$ pwd
/home/conradL/workspace/groovy
[conradL@qimr13054 groovy]$ ls
${sys:stardog.home} bin lib src test
[conradL@qimr13054 groovy]$ ls '${sys:stardog.home}'
stardog.log zookeeper.log
[conradL@qimr13054 groovy]$ ls -l '${sys:stardog.home}'/*.log
-rw-rw-r-- 1 conradL conradL 0 Nov 27 15:09 ${sys:stardog.home}/stardog.log
-rw-rw-r-- 1 conradL conradL 0 Nov 27 15:09 ${sys:stardog.home}/zookeeper.log
The creation of the '${sys:stardog.home}' directory doesn't seem dependent on what is in the test, and the tests are all pretty simple client-side stuff that connect to a Stardog database and check whether we can create/update/delete things, whereas those logs look like server-side logs.
Obviously a lot of the context is specific to us so I have been a bit hand-wavy in the description, but perhaps you can give me a pointer as to what might be going on here...