Bats Testing Patterns

Overview

Bats (Bash Automated Testing System) provides a TAP-compliant testing framework for shell scripts. This skill documents proven patterns for writing effective, maintainable shell script tests that catch bugs early and document expected behavior.

Use this skill when:

• Writing tests for Bash or shell scripts
• Creating test fixtures and mock data for shell testing
• Setting up test infrastructure for shell-based tools
• Debugging failing shell tests
• Integrating shell tests into CI/CD pipelines

Core Testing Patterns

Basic Test Structure

Every Bats test file is a shell script with a .bats extension: