2.1Why Pulumi Changes the Testing Game

Pulumi's fundamental advantage is that infrastructure is defined in real programming languages -- TypeScript, Python, Go, or C#. This means you can use the same testing frameworks, assertion libraries, and CI patterns you already know. There is no need to learn a new DSL or testing tool: if you know pytest, you can test Pulumi Python programs. If you know vitest, you can test Pulumi TypeScript programs.

This is a significant departure from Terraform's HCL, where testing requires either specialized tools (Terratest, written in Go) or JSON plan analysis. With Pulumi, the test is just code testing code.