Turtles
Turtles is an Emacs elisp package that helps write ERT-based tests that check how Emacs renders buffers and windows. The ERT tests can be run interactively or in batch mode. You’ll find the source code of this package on https://github.com/szermatt/turtles
Go to Tutorial to get started.
Turtles is especially suited to test:
the effect of display, before-string, after-string text properties
the effect of overlays
text visibility
mode lines
complex minibuffer interactions
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/