Cover plugin is an integration of Erlang cover tool with ErlIde. It provides a friendly graphical user interface that helps configuring and viewing coverage analysis for your project. That is how it simplifies a process of testing Erlang projects developed with ErlIde.
To learn more about cover click the following link http://www.erlang.org/doc/apps/tools/cover_chapter.html. Cover reference manual can be found here http://www.erlang.org/doc/man/cover.html.
Cover plugin is meant to be integrated with any testing Plugin (EUnit, Common Test, QuickCheck) through Cover API plugin (for details see: https://github.com/esl/erlide/wiki/Cover-notes)
If you want to understand the source code go here
You can find examples how to use this plugin here
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