Using test blocks in eev

This video is about how I've been documenting complex functions and data structures by putting chunks of executable code in comments (in "test blocks", see below), and how I execute these chunks line by line with eepitch. The "line by line" trick lets me follow what each line does without having to add any comments.

Links to the video (4m45s long):
http://angg.twu.net/eev-videos/2020-test-blocks-1.mp4
http://www.youtube.com/watch?v=fpsF_M55W4o

Links to documentation:
(find-eepitch-intro "3. Test blocks")
(find-eepitch-intro "3.2. Test blocks as documentation")

More videos about eev:
http://angg.twu.net/emacsconf2020.html#more-videos
(find-videos-intro "1. Some videos")

Discussion on Reddit:
https://www.reddit.com/r/emacs/comments/l3tg2x/using_test_blocks_in_eev/