Supertap simplifies testing command-line interfaces in Node.js. It offers a clean, intuitive syntax built upon the popular Tap testing framework, making it easy to assert expected output and exit codes from your CLI tools. Supertap streamlines the process of verifying the behavior of your command-line applications, leading to more robust and reliable software. Use Supertap to write better CLI tests! Supertap uses promises and await, requiring Node 8 or later.