Expressions don't expand in single quotes. This is why a real test suite is needed.
Expressions don't expand in single quotes. This is why a real test suite
is needed.

pblittle/docker-logstash,eternnoir/docker-logstash,TaylorMonacelli/docker-logstash-pblittle,dant3/docker-logstash,awyrough/docker-logstash