I use entr to run commands automatically when files change. Here’s how I use it to run tests.

Use:

ls lib/* spec/* | entr -c bin/test

Notes:

• Install: brew install entr
• -c clears the screen before running the command
• find lib spec -name '*.rb' works the similarly to ls, but I can’t always remember the syntax
• git ls-files is another option for watching tracked files in a repo
• watchexec is an alternative to entr, known for being more feature-rich