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