bats-testing-patternslisted

# 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. ## When to Use This Skill - 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) ## Detailed patterns and worked examples Detailed pattern documentation lives in `references/details.md`. Read that file when the navigation tier above is insufficient. ## Testing Error Conditions ```bash #!/usr/bin/env bats @test "Function fails with missing file" { run my_function "/nonexistent/file.txt" [ "$status" -ne 0 ] [[ "$output" == *"not found"* ]] } @test "Function fails with invalid input" { run my_function "" [ "$status" -ne 0 ] } @test "Function fails with permission denied" { touch "$TMPDIR/readonly.txt" chmod 000 "$TMPDIR/readonly.txt" run my_function "$TMPDIR/readonly.txt" [ "$status" -ne 0 ] chmod 644 "$TMPDIR/readonly.txt" # Cleanup } @test "Function provides helpful error message" { run my_function --invalid-option [ "$status" -ne 0 ] [[ "$output" == *