fixes #546 Tests are not thread-safe
fixes #546 Tests are not thread-safe

JackDunaway/featherweight-nanomsg,reqshark/nanomsg,snikulov/nanomsg,reqshark/nanomsg,JackDunaway/featherweight-nanomsg,snikulov/nanomsg,thisco-de/nanomsg,yan97ao/nanomsg,yan97ao/nanomsg,wirebirdlabs/featherweight-nanomsg,wirebirdlabs/featherweight-nanomsg,reqshark/nanomsg,imp/nanomsg,featherweight/ftw-kernel-nanomsg,imp/nanomsg,wirebirdlabs/featherweight-nanomsg,thisco-de/nanomsg,featherweight/ftw-kernel-nanomsg,yan97ao/nanomsg,JackDunaway/featherweight-nanomsg,imp/nanomsg