NetDevOps: Testing in CI/CD pipeline

I’m trying to get my head wrapped around something while I’m trying to develop a CI/CD pipeline POC.

This all revolves around the testing portion on a checked out branch using VIRL. We have many sites and data centers all with their own IP address schema and one off environments. Other than that, they are mostly standard. How can one test this in VIRL with all these differences. This works for software, but I’m trying to understand how this works with so many variations in network.