What is used to automate the testing phase of a NetDevOps automated pipeline?

pyATS (Python Automated Test System) is a comprehensive, open-source, and platform-independent network test automation framework developed by Cisco. It provides rich capabilities for interacting with network devices, parsing outputs, and verifying network states, making it an ideal choice for automating functional and operational tests within a NetDevOps pipeline.

Pillow is a Python Imaging Library (PIL) fork, used for image processing and manipulation, which is unrelated to network test automation.

Flask is a popular micro web framework for Python, used for building web applications and APIs, not for automating network device testing.

Tornado is an asynchronous web framework and networking library for Python, also primarily used for web development and high-performance network applications, not for automating tests on network devices.