terraform-test

Terraform testing uses .tftest.hcl or .tftest.json files with run blocks for unit tests (plan mode) and integration tests (apply mode), plus assert blocks to validate resource attributes and outputs. This catches configuration errors and regressions before deployment.

Yes, mock providers in Terraform tests simulate cloud behavior for fast, cost-free unit testing. Mock providers let you verify module logic and resource attributes in plan mode without provisioning actual infrastructure.

Assert blocks define conditions to verify resource attributes, plan changes, and outputs. Combine multiple assertions within a run block to validate expected behavior—such as subnet counts, CIDR blocks, or security group rules—against your infrastructure code.

Use variables, providers, and run blocks to construct test scenarios. Define variable values at test time, configure mock or real providers per scenario, and execute run blocks sequentially or in parallel to test different configuration paths and edge cases.

Terraform testing framework integrates into CI/CD systems via test commands and parallel execution. Run tests in your pipeline to catch breaking changes early and ensure infrastructure reliability on every commit.

Test cleanup follows a defined destruction order: resources created during apply are destroyed in reverse dependency order. Control cleanup behavior with test configuration to ensure proper teardown and prevent resource leaks between test runs.