# BRIEFING — 2026-10-02T02:51:00Z

## Mission
Develop automated test suites for Milestone 3 covering BiomeTextureManager (JS unit test) and 30 biomes generation & WebApp API integration E2E (Python pytest).

## 🔒 My Identity
- Archetype: test_writer
- Roles: specialist, qa
- Working directory: c:\Projects\FreeExile\.agents\teamwork\test_writer_m3
- Original parent: 327366ba-dd05-4805-b53b-659a199b1450
- Milestone: milestone_3

## 🔒 Key Constraints
- Exclusive write boundaries:
  - tests/unit/test_biome_texture_manager.js (NEW)
  - tests/e2e/test_30_biomes_generation_e2e.py (NEW)
  - Agent folder metadata in .agents/teamwork/test_writer_m3/
- Test behavior, edge cases, contracts; do NOT modify implementation code.
- Must verify 100% pass rate on implemented features, and escalate discovered defects.
- Must verify code hygiene with python tools/lint/check_code_and_doc_hygiene.py --strict.

## Current Parent
- Conversation ID: 327366ba-dd05-4805-b53b-659a199b1450
- Updated: 2026-10-02T02:51:00Z

## Task Summary
- **What to build**:
  1. `tests/unit/test_biome_texture_manager.js`: Unit tests for `BiomeTextureManager` (pattern caching, fallback retrieval, active biome switching, memory cleanup on switch, graceful procedural fallback for un-loaded tiles).
  2. `tests/e2e/test_30_biomes_generation_e2e.py`: E2E tests for procedural generation of 30 biomes (seeds 1..30), binary serialization (header offset 3 = biome_code), zone canonical biome resolution, `/api/map?zone_id=...&biome=...` query param integration.
- **Success criteria**: Genuine tests adhering to 4-tier methodology, 0 facade tests, negative baseline verified, strict hygiene check passes (0 Hard Cap errors).
- **Interface contracts**: PROJECT.md, ORIGINAL_REQUEST.md.
- **Code layout**: tests/unit/, tests/e2e/.

## Key Decisions Made
- Implemented `tests/unit/test_biome_texture_manager.js` (235 lines, <= 350 soft cap) with MockImage and MockContext2D to validate pattern caching, fallback retrieval, active biome switching, memory eviction (< 500 KB RAM), and adversarial edge cases.
- Implemented `tests/e2e/test_30_biomes_generation_e2e.py` (230 lines, <= 350 soft cap) with embedded ephemeral socketserver HTTP test fixture to test actual socket and query parameter handling without port collisions.
- Validated negative baselines: missing `biome_texture_manager.js` is caught cleanly, and missing `/api/map?biome=` handling in `serve_webapp.py` is caught cleanly.
- Verified 318 existing regression tests pass with 0 errors.

## Artifact Index
- tests/unit/test_biome_texture_manager.js — JS unit test suite for BiomeTextureManager
- tests/e2e/test_30_biomes_generation_e2e.py — Python pytest E2E suite for 30 biomes generation and map API

## Loaded Skills
- None explicitly assigned.

## Quality Status
- **Build/test result**:
  - `tests/e2e/test_30_biomes_generation_e2e.py`: 14 passed, 2 failed on missing `?biome=` query param in `serve_webapp.py` (escalated to worker).
  - `tests/unit/test_biome_texture_manager.js`: negative baseline verified (waiting on `biome_texture_manager.js`).
  - Map regression suite (318 tests): 100% PASS (3.82s).
  - LRU stress suite: 100% PASS.
- **Lint status**: 0 Hard Cap violations, 0 Soft Cap warnings for authored test files.
- **Tests added/modified**: 2 new test suites covering 24 test cases/sections.