GROOVY-9922: make test more robust on CI environments
GROOVY-9922: make test more robust on CI environments

apache/groovy,paulk-asert/groovy,apache/incubator-groovy,paulk-asert/groovy,apache/incubator-groovy,apache/groovy,paulk-asert/groovy,apache/incubator-groovy,apache/groovy,apache/groovy,apache/incubator-groovy,paulk-asert/groovy