This is the situation: you have an Erlang/OTP project you have tests in test directory (cool!) you have one or more sub-directories in your test directory containing source files you just got upgraded to rebar3 version 3.14 and your tests started to fail You might get an undef error because modules in test sub-directories are […]

Common Test code coverage and usage is documented here and here, but: there are no examples given documentation fails to state what the minimum required configuration is to turn on code coverage the implementation has no sane defaults and by default code coverage is disabled So, here’s the minimum sane default: create a cover.spec file […]