when you call io:format in common_test, where does it go?

io:format calls in common_test modules don't come to the 开发者_运维百科user console, although error_log messages do. I can't figure out where io:format calls DO go, either. Running ack in my repo on relevant strings turns up nothing. Does anyone know where they go?

Define {logdir, "logs"}. in your spec and then the io:format goes to the log. It is done by setting the group_leader via erlang:group_leader/2 to capture the IO output from your tests.

The actual output is underneath the respective test case in the log output of that test case. logs/index.html is your starting point to peruse.

Finally, it is somewhat loosely documented in http://www.erlang.org/doc/apps/common_test/run_test_chapter.html section 6.9.