Guru Pratap Singh developed a Dockerized test automation environment for the tramlinehq/tramline repository, focusing on aligning local development with CI workflows. He introduced a container-based setup for RSpec, allowing tests to run reproducibly both locally and in continuous integration. By updating the Justfile and docker-compose.yml, he enabled developers to flexibly execute specs either inside a Docker container or on their local machine. The test database was configured to connect seamlessly with a Dockerized PostgreSQL instance, ensuring environment parity. His work leveraged Ruby, Shell, and YAML, demonstrating a thoughtful approach to CI/CD and test orchestration within a Ruby on Rails project.