Terraform Advanced — Testing Pyramid for IaC

less than 1 minute read

Apply the testing pyramid to infrastructure code.

The IaC Testing Pyramid

         ╱╲
        ╱  ╲        End-to-End (E2E)
       ╱    ╲       Deploy real infra, validate, destroy
      ╱──────╲
     ╱        ╲     Integration Tests
    ╱          ╲    Terratest — deploy modules, assert
   ╱────────────╲
  ╱              ╲   Unit Tests
 ╱                ╲  terraform test, plan assertions
╱──────────────────╲
╱                    ╲ Static Analysis
╱                      ╲ TFLint, tfsec, Checkov, OPA

Layer Comparison

Layer Tool Speed Cost What It Catches
Static TFLint, tfsec Seconds Free Syntax, best practices, security
Unit terraform test Seconds Free Logic, variable validation
Integration Terratest Minutes $$ Real API behavior, module composition
E2E Full deploy 10+ min $$$ Everything, including DNS, networking 
Every PR:     Static analysis + unit tests (< 30 seconds)
Nightly:      Integration tests against dev account
Pre-release:  Full E2E in staging

💡 Production Tip: Start with static analysis — it’s free, fast, and catches 80% of issues.

What’s Next?

Set up TFLint and tfsec.

← Testing TFLint & tfsec →

Updated:

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