Add verbose message to random failed assertion
for example: http://ci.rvm.jp/results/trunk-random1@phosphorus-docker/3111251 http://ci.rvm.jp/results/trunk-random1@phosphorus-docker/3109195
Add verbose message to random failed assertion
for example:
http://ci.rvm.jp/results/trunk-random1@phosphorus-docker/3111251
http://ci.rvm.jp/results/trunk-random1@phosphorus-docker/3109195