Specinfra is a Ruby library that provides a common layer for infrastructure testing tools like serverspec and itamae. It offers a unified interface to check system properties (packages, services, files, network configuration, etc.) across diverse operating systems and execution environments. The architecture features a clean separation of concerns: backend abstractions for different execution methods (local, SSH, Docker, WinRM, etc.), a command factory for OS-specific command generation, and modular helpers for system detection and property management. The library dynamically selects the appropriate implementation based on the target system's OS and version, then executes checks via the chosen backend. Key entry points include the main Specinfra module, the Backend system, and the CommandFactory, which together enable extensible infrastructure verification.
Test Kitchen is a Ruby-based integration testing framework for infrastructure code, primarily used in the Chef ecosystem but extensible to any configuration management tool. It provides a CLI (`kitchen`) that orchestrates a lifecycle of actions—create, converge, setup, verify, destroy—across isolated target platforms (VMs, containers, cloud instances) using a plugin architecture for drivers, provisioners, transports, and verifiers. Configuration is defined in YAML files (`.kitchen.yml`) with layered merging (global, project, local) and ERB support. The core library manages instance state via YAML files, structured logging (NDJSON), lifecycle hooks, and concurrency. External dependencies include SSH (net-ssh), WinRM (chef-winrm), and shell execution (mixlib-shellout). The codebase is well-structured with extensive unit and integration tests, but carries some technical debt from legacy Chef provisioner migration and outdated documentation assets.