How to Test Infrastructure as Code Using tflint, Checkov, and Terratest

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A technical guide published on DEV Community outlines three complementary layers for testing Infrastructure as Code (IaC) before deploying to production. The first layer uses tflint for static analysis, catching syntax errors and provider-specific issues in seconds without requiring cloud credentials. The second layer employs Checkov to scan Terraform code against security and compliance policies — such as CIS Benchmarks and PCI-DSS — flagging misconfigurations like open S3 buckets or disabled encryption. The third and deepest layer uses Terratest to run actual cloud deployments in isolated environments, validate results, and tear down resources, ensuring modules work end-to-end. The article recommends running all three layers in sequence within a CI/CD pipeline, failing fast on cheaper checks before reaching the more time-consuming and costly integration tests.

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