It's important to close all Graph instances opened by a test in the test suite (as it can cause problems for some providers executing the tests). Typically the test suite handles that for you, but you definitely have to take care when spinning up your own from the test base classes. I've created this issue:
https://issues.apache.org/jira/browse/TINKERPOP3-983 that when implemented will hopefully act as an early warning system for test writers (if possible, i might also try to include auto-cleanup for open graphs, if possible). In the mean time please try take care that Graph instances don't leak from a test. Thanks, Stephen
