Whenever someone says "most people don't write large Bash scripts", I have to chime in and say that I would consider most GNU/Linux distros to be giant piles of shell scripts.
A year or two ago, Arch Linux migrated the tests for dbscripts (the server-side of how package releases happen) from shUnit2 to BATS. https://git.archlinux.org/dbscripts.git/
A year or two ago, Arch Linux migrated the tests for dbscripts (the server-side of how package releases happen) from shUnit2 to BATS. https://git.archlinux.org/dbscripts.git/