I will attempt to learn Clojure during this year's AoC.
To run a particular day, cd into the folder and run:
clj -m advent < input.txt
To run tests using Spacemacs and CIDER, first open a CIDER session:
SPC m s i
And run all tests (you might need to run this command in both the src file and the test file to load them):
SPC m t a
Then you can run a single test by moving the cursor on a deftest and run it with:
SPC m t t