Verifies the saved JSON is readable, that two successive saves
produce byte-identical output, and that re-loading the saved file
recovers the same cell values that were written before saving.
Uses engine.module.dir_of to write the round-trip fixture to the
lib maps/ directory (asset sandbox rejects absolute temp paths).
tile.id is now an integer; the stable string identifier is tile.name.
Updates all tile-record string-id assertions to use .name. Adds
walkable field to stub atlas JSONs so gameplay assertions pass without
the legacy tiles dir. Test bootstrap calls maps.load_textures with
aliases pointing to the test-lib itself as the asset provider. Moves
load_textures calls inline after each set_current (Task 4 and Task 9
blocks) so all tile-record shape and walkability checks use atlas
records throughout. Bumps version to 0.3.0, dep on maps 0.3.0.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Migrates the test-lib content authored alongside lib-core.maps v0.2.0
into its canonical role=test location. Covers packed-u32 GID encode/
decode round-trip, v1 to v2 schema upgrade, schema-v2 validation,
multi-layer load, multi-atlas resolution, per-layer tile lookup with
tile_at backwards-compat, gameplay queries (is_walkable, blocks_walk,
blocks_sight), layer iteration around the entity slot, and v1 JSON
auto-migration on load. 367 assertions total when run via the engine
test-libs harness.
New fixtures: maps/demo_v2.map.json (4x4 multi-layer with roof) and
assets/tiles/walls_tilemap.tilemap.json (second atlas with wall tiles).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
