terraform-vsphere-resourcegroups/TEST_SUMMARY.md

Terraform Testing Implementation Summary

Overview

This document summarizes the Terraform testing implementation for the vSphere Resource Groups module.

Implementation Details

Test Statistics

• Total Test Files: 3
• Total Test Cases: 21
  • resource_groups.tftest.hcl: 7 tests
  • custom_configuration.tftest.hcl: 6 tests
  • variable_validation.tftest.hcl: 8 tests

Test Coverage

1. Default Behavior Tests (resource_groups.tftest.hcl)

Test Case	Purpose
verify_default_resource_groups	Validates all 5 default resource groups are created
validate_shares_mapping	Ensures shares mapping logic (low=500, normal=1000, high=2000)
verify_tag_categories	Confirms Environment and ResourceGroupType tag categories
verify_resource_group_tags	Validates tags created for each resource group
verify_default_resource_pool_config	Checks default CPU/memory configurations
verify_outputs	Ensures all outputs are generated correctly
verify_resource_pool_names	Validates resource pool naming conventions

2. Custom Configuration Tests (custom_configuration.tftest.hcl)

Test Case	Purpose
custom_resource_group_config	Tests high-priority custom configurations
low_priority_resource_group	Validates low-priority share allocation
non_expandable_resource_group	Tests fixed resource allocation
multiple_custom_resource_groups	Validates multiple resource groups with different priorities
environment_specific_config	Tests environment variable integration
single_resource_group	Edge case: single resource group scenario

3. Variable Validation Tests (variable_validation.tftest.hcl)

Test Case	Purpose
valid_environment_values	Validates accepted environment values
datacenter_variable	Tests datacenter variable acceptance
cluster_name_variable	Tests cluster name variable
resource_groups_structure	Validates resource_groups map structure
optional_parameters_defaults	Verifies default values are applied
shares_value_mapping	Tests all three share levels
empty_resource_groups	Handles empty resource_groups map
resource_limits_validation	Validates CPU/memory limits configuration

CI/CD Integration

Pipeline Workflow

TFLint → Tfsec → Checkov → Terraform Test → SonarQube → Terraform Init → Terraform Plan → Terraform Apply
                              ↑
                         New Test Step

Test Job Details

The terraform-test job in .gitea/workflows/sonarqube.yaml:

1. Checkout Code: Fetches repository with full history
2. Setup Terraform: Installs latest Terraform version
3. Format Check: Validates code formatting (terraform fmt -check -recursive)
4. Run Tests: Executes all tests with verbose output
5. Generate Report: Creates test execution report
6. Upload Artifacts: Stores test report for 30 days

Environment Variables

Tests use mock credentials to avoid requiring actual infrastructure:

• TF_VAR_role_id: "test-role-id"
• TF_VAR_secret_id: "test-secret-id"

Files Created

Test Files

• tests/resource_groups.tftest.hcl - Default resource group tests
• tests/custom_configuration.tftest.hcl - Custom configuration tests
• tests/variable_validation.tftest.hcl - Variable validation tests
• tests/setup/main.tf - Mock provider setup

Documentation

• TESTING.md - Comprehensive testing guide
• TEST_SUMMARY.md - This summary document
• .github/TESTING_QUICK_START.md - Quick reference guide

Configuration Updates

• .gitea/workflows/sonarqube.yaml - Added terraform-test job
• README.md - Added testing section
• CLAUDE.md - Updated with testing commands

Running Tests

Local Execution

# Run all tests
terraform test

# Run with verbose output
terraform test -verbose

# Run specific test file
terraform test -filter=tests/resource_groups.tftest.hcl

CI/CD Execution

Tests automatically run on:

• Push to master branch
• Pull request (opened, synchronized, reopened)

Test Quality Metrics

Assertions by Category

• Resource Creation: 8 assertions
• Configuration Validation: 25+ assertions
• Tag Management: 6 assertions
• Output Validation: 4 assertions
• Edge Cases: 4 assertions
• Variable Validation: 10+ assertions

Coverage Areas

✅ Resource pool creation and naming ✅ CPU/Memory reservation, limits, and shares ✅ Shares value mapping (low/normal/high) ✅ Tag category creation ✅ Tag application to resources ✅ Output generation ✅ Variable validation ✅ Default value application ✅ Custom configuration override ✅ Edge cases (empty maps, single items) ✅ Environment-specific configuration

Benefits

1. Early Error Detection: Catch configuration errors before deployment
2. Regression Prevention: Ensures changes don't break existing functionality
3. Documentation: Tests serve as executable documentation
4. Confidence: Validates module behavior across scenarios
5. Quality Gates: Automated quality checks in CI/CD pipeline

Future Enhancements

Recommended Additions

1. Mock Providers: Complete isolation from infrastructure
2. Coverage Reporting: Metrics on test coverage percentage
3. Performance Tests: Validate behavior with large numbers of resource groups
4. Integration Tests: Tests against actual vSphere environment (staging)
5. Contract Tests: Ensure output structure stability
6. Property-Based Testing: Generate random valid configurations

Potential Test Scenarios

• Test with maximum number of resource groups (scalability)
• Validate behavior with special characters in names
• Test resource pool hierarchy and inheritance
• Validate concurrent resource group creation
• Test failure scenarios (invalid configurations)
• Validate resource pool updates (state migration)

Maintenance

When to Update Tests

• Adding new features or configuration options
• Changing default values
• Modifying resource creation logic
• Updating provider versions
• Fixing bugs (add regression tests)

Test Review Checklist

• Tests pass locally (terraform test)
• Tests pass in CI/CD pipeline
• Test names are descriptive
• Error messages are clear and actionable
• Edge cases are covered
• Documentation is updated

Success Criteria

✅ All 21 tests successfully implemented ✅ CI/CD pipeline updated and tested ✅ Comprehensive documentation created ✅ Test execution automated ✅ Code formatting validated ✅ Quick start guide provided

References

• Terraform Testing Documentation
• Terraform Test Command Reference
• Testing Best Practices

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Implementation Date: 2025-11-09 Terraform Version Required: >= 1.6.0 Test Framework: Native Terraform Testing