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Master the Bash Automated Testing System (Bats) to ensure reliability and maintainability in your shell scripts and automation workflows. This skill offers structured guidance on implementing test-driven development (TDD) for CLI tools, creating robust test fixtures, and mocking external dependencies. Whether you are building complex CI/CD pipelines or simple utility scripts, these patterns help you validate behavior across different shell environments like Bash, Sh, and Dash, catching regressions before they reach production.