Added test case for checking the return code when an xid does not exist.
Merge branch 'handle-rollback-xid-not-found' into xa-not-found-testcase
Added fail condition in test case to detect if the expected exception is not thrown.
Merge pull request #73 from whitingjr/xa-not-found-testcase

Added test case for checking the return code when an xid does not exist.