bats-testing-patterns

Comprehensive guidance for writing comprehensive unit tests for shell scripts using Bats (Bash Automated Testing System), including test patterns, fixtures, and best practices for production-grade shell testing. Bats (Bash Automated Testing System) is a TAP (Test Anything Protocol) compliant testing framework for shell scripts that provides: - Writing unit tests for shell scripts - Implementing test-driven development (TDD) for scripts - Setting up automated testing in CI/CD pipelines - Testing edge cases and error conditions - Validating behavior across different shell environments - Building maintainable test suites for scripts - Creating fixtures for complex test scenarios - Testing multiple shell dialects (bash, sh, dash) - Simple, natural test syntax - TAP output format compatible with CI systems - Fixtures and setup/teardown support - Assertion helpers - Parallel test execution - Test one thing per test - Single responsibility principle - Use descriptive test names - Clearly states what is being tested - Clean up after tests - Always remove temporary files in teardown - Test both success and failure paths - Don't just test happy path - Mock external dependencies - Isolate unit under test - Use fixtures for complex data - Makes tests more readable - Run tests in CI/CD - Catch regressions early - Test across shell dialects - Ensure portability - Keep tests fast - Run in...