# BRIEFING — 2026-10-02T02:32:00Z

## Mission
Develop automated unit test suite `tests/unit/test_map_style_assets_integrity.py` verifying the integrity and quality of all 30 map style asset packages.

## 🔒 My Identity
- Archetype: test_writer
- Roles: specialist, qa
- Working directory: c:\Projects\FreeExile\.agents\teamwork\test_writer_m2
- Original parent: 327366ba-dd05-4805-b53b-659a199b1450
- Milestone: M2 - Map Style Assets Integrity Test Suite

## 🔒 Key Constraints
- Write test code only — never implementation code.
- Exclusive write boundary: `tests/unit/test_map_style_assets_integrity.py` and `.agents/teamwork/test_writer_m2/`.
- Verify all 30 style folders under `client/webapp/assets/map/styles/`.
- Verify required files per folder: `floor.png`, `wall.png`, `path.png`, `liquid.png`, `props.png`, `floor_normal.png`, `wall_normal.png`, `path_normal.png`, `liquid_normal.png`.
- Verify valid PNG magic header (`\x89PNG\r\n\x1a\n`).
- Verify image dimensions (floor/path/liquid either 64x32 or 128x64 px; wall 128x128 px).
- Verify normal maps have Blue channel dominant (B > 128) for tangent-space lighting shader standards.
- Verify file size efficiency: individual tile files < 60 KB, total asset folder size < 10 MB.
- Progressive testability: handle test execution cleanly whether assets are already generated or being generated by asset workers.

## Current Parent
- Conversation ID: 327366ba-dd05-4805-b53b-659a199b1450
- Updated: 2026-10-02T02:32:00Z

## Task Summary
- **What to build**: Comprehensive unit test suite `tests/unit/test_map_style_assets_integrity.py` for map style asset packages.
- **Success criteria**: Tests accurately validate all 30 styles, required files, PNG headers, dimensions, normal map blue dominance, and file size constraints.
- **Interface contracts**: `c:\Projects\FreeExile\.agents\teamwork\spec_miner_survey_3\handoff.md`, `c:\Projects\FreeExile\.agents\teamwork\orchestrator_14\PROJECT.md`.
- **Code layout**: `tests/unit/test_map_style_assets_integrity.py`.

## Loaded Skills
- None specified in dispatch.

## Quality Status
- **Build/test result**: 249/249 passed in `test_map_style_assets_integrity.py`, 335/335 passed across map test suite.
- **Lint status**: Clean (zero Hard Cap violations in `check_code_and_doc_hygiene.py --strict`).
- **Tests added/modified**: `tests/unit/test_map_style_assets_integrity.py` (284 lines, <= 350 line soft cap).

## Key Decisions Made
- Parameterized all 30 styles across test methods for granular visibility and regression tracking.
- Implemented robust validator functions for PNG magic bytes (`verify_png_magic_header`) and Blue channel mean (`compute_blue_channel_mean`).
- Added adversarial test suite testing corrupted magic headers, truncated files, non-existent files, sub-128 Blue normal maps, and invalid tile dimensions.

## Artifact Index
- `tests/unit/test_map_style_assets_integrity.py` — Map style assets integrity test suite (249 test cases)