Go CLI Testing: Build and Test a Word Counter

Command-line tools are the backbone of modern software automation, but ensuring they run reliably under different inputs is critical. This text-based course guides you through the core concepts of building and testing terminal applications in Go. You will start by understanding how command-line interfaces work, learning basic Go testing terminology, and setting up your first test suite. By reading through clear explanations and analyzing practical code examples, you will master the art of writing testable Go code. You will transition from manual execution to automated verification, learning how to handle standard input, file arguments, and output formatting. What you'll learn: - Understand foundational Go testing concepts and CLI application architecture - Write automated unit tests using the built-in Go testing package - Implement table-driven tests to easily cover multiple input scenarios and edge cases - Structure your Go CLI code using interfaces to mock standard input and output - Run tests and analyze code coverage using standard command-line flags - Apply best practices for handling errors and edge cases in command-line utilities This course begins with essential definitions and testing fundamentals before walking you through the structure of a command-line word counter. You will learn how to decouple your business logic from terminal operations, making your code clean, modular, and easy to maintain. This course is designed for beginner Go programmers and developers looking to learn how to write testable command-line tools from scratch. No advanced testing experience is required. Start building reliable, automated command-line utilities in Go today.