Infrastructure Testing

Modern Testing Approaches

Policy Testing

# OPA policy test example
policy "cloud_resource_naming" {
  enforcement_level = "mandatory"
  
  validate_resource "aws_s3_bucket" {
    name_pattern = "^[a-z0-9-]+$"
    description = "S3 bucket names must be lowercase alphanumeric with hyphens"
  }
}

End-to-End Testing

package test

import (
    "testing"
    "github.com/gruntwork-io/terratest/modules/terraform"
    "github.com/stretchr/testify/assert"
)

func TestTerraformDeployment(t *testing.T) {
    terraformOptions := &terraform.Options{
        TerraformDir: "../examples/complete",
        Vars: map[string]interface{}{
            "environment": "test",
            "region":     "us-west-2",
        },
    }
    
    defer terraform.Destroy(t, terraformOptions)
    terraform.InitAndApply(t, terraformOptions)
    
    output := terraform.Output(t, terraformOptions, "cluster_endpoint")
    assert.NotEmpty(t, output)
}

Compliance Validation

Checkov Implementation

name: IaC Security Scan
on: [pull_request]
jobs:
  scan:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    - name: Run Checkov
      uses: bridgecrewio/checkov-action@v12
      with:
        directory: terraform/
        framework: terraform
        quiet: true
        soft_fail: false

Test Categories

Unit Tests

  • Resource validation

  • Input validation

  • Output validation

  • Variable constraints

Integration Tests

  • Resource dependencies

  • Service connections

  • Network connectivity

  • IAM permissions

Security Tests

  • CIS benchmarks

  • Compliance checks

  • Security group rules

  • IAM policies

Performance Tests

  • Deployment time

  • Resource limits

  • Cost estimation

  • Scaling behavior

Best Practices

  1. Test Environments

    • Isolated testing accounts

    • Clean state management

    • Resource cleanup

    • Cost controls

  2. Continuous Testing

    • Pre-commit hooks

    • CI/CD integration

    • Automated validation

    • Drift detection

  3. Documentation

    • Test coverage reports

    • Compliance documentation

    • Change tracking

    • Test scenarios

Last updated