sunspot_solr still running after finishing the tests

[rocket-turtle]

After I run my tests the sunspot_solr is still alive.

at_exit { Process.kill("TERM", pid) } does not run the ./solr stop.
server.start and server.stop can be used to workaround this.
I would be happy to provide a PR if someone is going to merge it.

sunspot_test/lib/sunspot_test.rb

Line 32 in 45a2b31

at_exit { Process.kill("TERM", pid) }

$ ps aux | grep java
xxx 52735 0,1 0,3 4509468  53744 s001 S 2:11pm 0:21.76 /usr/bin/java -server -Xss256k -Xms512m -Xmx512m -XX:NewRatio=3 -XX:SurvivorRatio=4 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=8 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:ConcGCThreads=4 -XX:ParallelGCThreads=4 -XX:+CMSScavengeBeforeRemark -XX:PretenureSizeThreshold=64m -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=50 -XX:CMSMaxAbortablePrecleanTime=6000 -XX:+CMSParallelRemarkEnabled -XX:+ParallelRefProcEnabled -verbose:gc -XX:+PrintHeapAtGC -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+PrintTenuringDistribution -XX:+PrintGCApplicationStoppedTime -Xloggc:/Users/xxx/.rvm/gems/ruby-2.2.7@yyy/gems/sunspot_solr-2.2.7/solr/server/logs/solr_gc.log -Djetty.port=50176 -DSTOP.PORT=49176 -DSTOP.KEY=solrrocks -Duser.timezone=UTC -Djetty.home=/Users/xxx/.rvm/gems/ruby-2.2.7@yyy/gems/sunspot_solr-2.2.7/solr/server -Dsolr.solr.home=/Users/xxx/rails/develop/project/solr -Dsolr.install.dir=/Users/xxx/.rvm/gems/ruby-2.2.7@yyy/gems/sunspot_solr-2.2.7/solr -jar start.jar --module=http

Update:
The issue in sunspot has been fixed.
sunspot/sunspot#843

Note there is a Problem with server.stop so we should use at_exit { fork { server.stop } }