CLI Testing

Node.js

Testing Node.js CLI Tools with oclif and Jest

Building a CLI tool with oclif is pleasantly structured. Each subcommand is a class with a run() method. Flags and args are declared statically. The framework handles parsing, help generation, and error formatting. The problem is that most teams treat this structure as incidental and test nothing until something breaks

Testing Go CLI Applications with Cobra and testscript

CLI tools are deceptively hard to test. They interact through stdin and stdout, depend on environment variables and working directories, return exit codes instead of values, and often spawn subprocesses. Most teams settle for a few manual smoke tests and call it done. When the CLI breaks in a way