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There are two types of testing IaC code: manual and automated. The manual method involves simply deploying infrastructure using your code into a sandbox environment and running manual tests against what you have deployed to check your code does what you want. This could be using CURL to validate web access, A SQL client to test access to a database, or remoting into a server and running local tests.
The automated method is by nature of it being automatic far more complicated. This document will focus into automated testing.
Terratest is an open-source Go library that provides patterns and helper functions for testing infrastructure, with first-class support for Terraform, Docker, Packer, and other infrastructure-as-code tools, facilitating the writing and execution of automated tests to ensure the correctness and robustness of the infrastructure.
Terraform testing types primarily include unit testing, integration testing, and end-to-end testing, used to validate individual components, the interactions between components, and the complete functionality of the Terraform code respectively.
Unit tests in Terraform are used to validate the behavior of individual resources or modules, ensuring that they function as expected when given specific input, thereby contributing to the robustness and reliability of the infrastructure as code.
This is a production site.