The project is configured for use with clojure or with babashka. The tests work only with clojure, but you can run them using a babashka task.
For example:
# run the day01 with clj
$ clj -M -m aoc.day01
# run the day01 with babashka
$ bb -m aoc.day01
# only test the day01 with clj
$ clj -M:test -n aoc.day01-test
# only test the day01 with babashka (uses clj internaly)
$ bb test -n aoc.day01-test
# all test with clj
$ clj -M:test
# all test with babashka (use clj internaly)
$ bb test
Happy coding!