Useful Code Coverage Reports with Etap
This evening I added the etap_report module to the etap project. This module can be used to create nice looking, well-formatted html code coverage reports. This is a great way to get a quick view into your project’s code coverage and determine what areas need to be focused on when creating test code.
Using the etap_report module is simple. It exports the create/0 function which is called in the directory that your coverdata files are created in. The process looks something like this.
$ cd ~/dev/erlang_protobuffs
$ COVER=1 make test
$ erl -eval 'etap_report:create()' -s init stop
$ open protobuffs_report.html
An example can be found here: http://ngerakines.github.com/erlang_protobuffs/coverage/protobuffs_report.html
Just remember: When do I test?