This used to be ERT, a tool for automated testing in Emacs Lisp. ERT is now included in Emacs trunk; this repository is no longer maintained. To get ERT, either build Emacs from trunk, or grab the following files which represent the last state of ERT before its installation into Emacs: https://github.com/ohler/ert/blob/c619b56c5bc6a866e33787489545b87d79973205/lisp/emacs-lisp/ert.el https://github.com/ohler/ert/blob/75ca9dd0859d16db4da88eec0c15fbc43f25ca97/lisp/emacs-lisp/ert-x.el https://github.com/ohler/ert/blob/bc51e3e8121d51dc88618847f0958e7ec832c7d2/test/automated/ert-tests.el https://github.com/ohler/ert/blob/75ca9dd0859d16db4da88eec0c15fbc43f25ca97/test/automated/ert-x-tests.el