-Call `make test` when any file changes in this directory/subdirectory, except
-for everything below `target`:
+```txt
+-w, --watch ./src/ watch the given directory
+-e, --exts js,css watch only the given extensions
+-i, --ignore '*.md' do not watch the given pattern
+-d, --debounce 5000 the minimum number of milleseconds
+ to wait between changes