Addie Beach discusses the challenges of managing data sprawl in testing ecosystems and proposes integrating test data management into infrastructure platforms like Terraform. This approach helps maintain synchronized testing environments, allows for quick provisioning, and supports robust backups. The author highlights the integration of Terraform with Datadog, enabling the creation and management of synthetic tests, including multi-step API and browser tests, while leveraging global variables and tag policies for consistency and ownership tracking. The text emphasizes the flexibility of using Terraform to customize tests and manage configurations, while also allowing non-technical teams to utilize Datadog's UI for code-free test creation. It suggests using subtests to modularize and simplify test creation across teams, ultimately advocating for treating tests as infrastructure to improve efficiency and reliability in test management.