[brikis98]

I'm one of the creators of Terratest. Happy to answer questions.

The main question I've seen so far seems to be how Terratest compares with various "spec" tools (e.g., inspec, serverspec). Most of the spec tools focus on checking the properties of a single server or resource. For example, is httpd installed and running? Terratest is largely for end-to-end, acceptance style testing, where you deploy your real infrastructure, in a real environment (e.g., AWS), and test the infrastructure actually works as expected.

For example, let's say you wanted to test a module for running Vault (https://github.com/hashicorp/terraform-aws-vault), which is a distributed secret store. With a spec tool, you might test a single Vault node to check that Vault is installed and the process is running. With Terratest, you'd check that the whole Vault cluster deployed correctly, bootstrapped itself (including auto-discovery of the other nodes), that you can initialize the cluster, unseal it store data, retrieve data, and so on.