Terratest

Terratest is an open-source Go library for writing automated tests for infrastructure code. It suits teams that need to exercise Terraform, Kubernetes, cloud, and related infrastructure workflows; its central trade-off is the Go requirement and the care needed when tests create real resources.

Overview

Rather than replace an infrastructure tool, Terratest gives Go tests helpers for running tools, checking what they deploy, and tearing it down. That makes it a practical fit for teams that want infrastructure checks in an automated test workflow, not just static review. The project is Apache 2.0 licensed, with general questions handled through GitHub Discussions and bug reports or improvement requests through GitHub Issues.

Key features

Tests use Go’s testing framework and can run infrastructure tools, validate deployed infrastructure, then undeploy it. Built-in checks make HTTP requests, call APIs, or connect over SSH; helpers also cover shell commands. This supports checks against running environments, but because deployments can create real resources, cleanup belongs in the test plan rather than as an afterthought.

Terratest provides helpers for Terraform and OpenTofu, Terragrunt, Packer, Docker, Kubernetes, and Helm, along with AWS, Azure, and GCP APIs. Its documentation covers unit, integration, and end-to-end approaches, as well as parallel tests, retries, error handling, and static analysis. The breadth is useful for teams spanning several infrastructure tools; the Go-based framework is less suitable for teams seeking a standalone, language-neutral testing interface.

The quick start requires Go 1.26 or later and OpenTofu or Terraform for its examples. The execution model is local, and the feature set includes provisioning tests, deployed checks, configuration compliance, and policy as code.

Pricing

Terratest is free and open source. The Apache 2.0 open-source license plan costs nothing and requires Go 1.26 or later; it is the natural choice for teams able to work within that toolchain. There are no cheaper tiers with reduced capabilities. Companies relying on Terratest in production can obtain commercial support directly from Gruntwork.

Platforms

Terratest supports Linux. Its local execution model and Go requirement make it a fit for Linux-based development and test environments; no broader platform recommendation follows from that support.

Who it's for

Terratest is best for engineering teams that already use Go and want repeatable tests around infrastructure code, including deployments that need API, HTTP, or SSH validation. Teams should account for real-resource cleanup, and should look elsewhere if they need a non-Go workflow or a broader platform target than Linux.

Pros and cons

• Pros: One Go test workflow can run infrastructure tools, inspect deployed resources, and tear them down, making it useful for integration and end-to-end checks.
• Pros: Helpers span major IaC tools, cloud APIs, and HTTP, SSH, and shell checks, supporting varied infrastructure stacks.
• Pros: Apache 2.0 licensing makes the library free to use, with commercial support available from Gruntwork for production reliance.
• Cons: Go 1.26 or later is required by the quick start, which rules out teams unwilling to adopt that language and version.
• Cons: Tests may provision real infrastructure, so teams must implement cleanup to avoid leaving resources behind.
• Cons: The v1 line receives security fixes only while v2 is in development, a maintenance constraint for teams choosing that line.

Alternatives

Infrastructure Testing Tools is the broader category for comparing options. Choose Test Kitchen if cross-platform support across Linux, macOS, and Windows matters more than Terratest’s Go-based workflow. Checkov is another free, open-source CLI option, with Linux and macOS support.

Chef InSpec may suit readers looking for a free non-production option for personal, non-commercial use, or a 30-day trial. KICS is a free open-source project for readers comparing another infrastructure policy-as-code tool. AWS CloudFormation is worth considering for AWS-focused infrastructure work; CloudFormation itself is free, while underlying AWS resources are billed at their own rates.

Cinc Auditor is a free distribution of Chef InSpec, without formal warranties or support. Conftest is another Apache 2.0 open-source option. Sonobuoy is an open-source alternative.

Verdict

Choose Terratest if your team uses Go and needs to test infrastructure by running tools, checking real deployments, and cleaning them up in one workflow. Its breadth and free Apache 2.0 license are compelling; the Go version requirement, resource-cleanup burden, Linux support, and security-fixes-only v1 maintenance are sound reasons to look elsewhere.