---
gsd_summary_version: 1.0
phase: 03-lab-02-network-vpc
plan: 01
type: execute
wave: 0
completed_date: "2026-03-25"
duration_seconds: 2700
---

# Phase 03 Plan 01: Test Infrastructure (TDD RED Phase) Summary

**One-liner:** Created comprehensive test suite following TDD methodology for Lab 02 Network & VPC, validating Docker bridge network creation, isolation between networks, and INF-02 compliance (no 0.0.0.0 port bindings).

## Overview

Plan 03-01 established the test infrastructure foundation for Lab 02 (Network & VPC) following Test-Driven Infrastructure (TDI) principles. All tests were created in RED phase (failing initially since no implementation exists), enabling students to verify their work as they progress through network isolation and VPC simulation.

## Artifacts Created

| File | Lines | Purpose |
|------|-------|---------|
| `labs/lab-02-network/tests/01-network-creation-test.sh` | 194 | Validate Docker bridge network creation and configuration |
| `labs/lab-02-network/tests/02-isolation-verification-test.sh` | 260 | Verify network isolation between bridge networks |
| `labs/lab-02-network/tests/03-inf02-compliance-test.sh` | 272 | Ensure INF-02 compliance: private networks don't expose ports on 0.0.0.0 |
| `labs/lab-02-network/tests/04-verify-infrastructure.sh` | 244 | Infrastructure verification script |
| `labs/lab-02-network/tests/99-final-verification.sh` | 325 | Student "double check" command for end-to-end validation |
| `labs/lab-02-network/tests/run-all-tests.sh` | 146 | Test suite orchestration with fail-fast behavior |
| `labs/lab-02-network/tests/quick-test.sh` | 196 | Quick validation for development |

**Total:** 1,637 lines of bash test code

## Technical Implementation

### TDD Methodology Applied
- **RED Phase:** Tests fail initially (expected - no infrastructure exists)
- **GREEN Phase:** Ready for next plan (03-03) where implementation will make tests pass
- **REFACTOR Phase:** Future optimization without breaking tests

### Key Technical Decisions

1. **Network Testing Framework**
   - Chose bash for portability and consistency with DevOps tasks
   - Used `set -euo pipefail` for strict error handling
   - Implemented helper functions for consistent test reporting

2. **Network Isolation Testing**
   - Tests verify connectivity between containers in same network
   - Tests verify isolation between containers in different networks
   - Uses `docker exec` with `ping`, `curl`, and `nc` for validation

3. **INF-02 Compliance Verification**
   - Scans docker-compose.yml for 0.0.0.0 port bindings
   - Verifies that private networks use --internal flag
   - Ensures no public exposure from private network containers

4. **Multi-Phase Testing**
   - Phase 1: Network creation validation
   - Phase 2: Isolation verification between networks
   - Phase 3: Security compliance (INF-02)
   - Phase 4: Infrastructure verification
   - Final: End-to-end validation

## Requirements Covered

- **TEST-01:** Test scripts validate network creation and isolation
- **TEST-05:** Test harness can be executed with single command (`run-all-tests.sh`)
- **INF-02:** Private networks don't expose ports on 0.0.0.0
- **LAB-02:** Docker bridge network simulation of VPC/Subnets

## Deviations from Plan

### Additional Artifact Created

**04-verify-infrastructure.sh** - Infrastructure verification script
- **Reason:** Added to provide comprehensive infrastructure validation
- **Lines:** 244
- **Purpose:** Verifies docker-compose.yml configuration and network setup

### Auto-Fixed Issues

None - all tests created successfully without deviations.

## Next Phase Readiness

Test infrastructure is complete and ready for:
- Plan 03-02: Diátaxis documentation creation
- Plan 03-03: Infrastructure implementation (GREEN phase)

The test suite provides comprehensive validation for Docker bridge networks simulating VPC and Subnets, with clear parallels to cloud networking concepts.

---
*Phase: 03-lab-02-network-vpc*
*Plan: 01*
*Completed: 2026-03-25*