feat(grid): map YAML schema, 5-10-5 grid, Dijkstra movement, corner LoS/cover

tests/test_los.py

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+"""Tests for corner-rule line of effect and cover (los.py).
+
+Geometry convention: a line is blocked when its relative interior touches a
+blocking square (interior, border, or vertex); lines that merely start or end
+on a blocking square's vertex do not count as passing through it.
+"""
+
+from __future__ import annotations
+
+from pf1e_simulator.grid import Grid
+from pf1e_simulator.los import has_cover, has_line_of_effect
+from pf1e_simulator.map import MapSpec, TerrainType
+
+
+def make_grid(rows: list[str]) -> Grid:
+    legend = {
+        "#": TerrainType(type="wall", move_cost=None, blocks_los=True),
+        ".": TerrainType(type="floor", move_cost=1),
+        "T": TerrainType(type="rubble", move_cost=2),
+        "C": TerrainType(type="pillar", move_cost=None, cover=True),
+    }
+    spec = MapSpec(name="test", terrain=tuple(rows), legend=legend)
+    return Grid.from_spec(spec)
+
+
+def test_los_open_field() -> None:
+    grid = make_grid(["...", "...", "..."])
+    assert has_line_of_effect(grid, (0, 0), (2, 2)) is True
+
+
+def test_los_same_square() -> None:
+    grid = make_grid(["."])
+    assert has_line_of_effect(grid, (0, 0), (0, 0)) is True
+
+
+def test_los_blocked_by_wall_between() -> None:
+    grid = make_grid([".#.", "..."])
+    assert has_line_of_effect(grid, (0, 0), (0, 2)) is False
+
+
+def test_los_through_doorway_gap() -> None:
+    grid = make_grid(["##.##", "##.##"])
+    assert has_line_of_effect(grid, (0, 2), (1, 2)) is True
+
+
+def test_los_pinched_vertex_stays_open() -> None:
+    grid = make_grid([".#.", "#.."])
+    assert has_line_of_effect(grid, (0, 0), (1, 1)) is True
+
+
+def test_los_blocked_past_wall_line() -> None:
+    grid = make_grid(["...#.", "....."])
+    assert has_line_of_effect(grid, (0, 0), (0, 4)) is False
+
+
+def test_cover_open_field() -> None:
+    grid = make_grid([".....", "....."])
+    assert has_cover(grid, (0, 0), (0, 4), ranged=True) is False
+
+
+def test_cover_pillar_between() -> None:
+    grid = make_grid([".....", "..C..", "....."])
+    assert has_cover(grid, (1, 0), (1, 4), ranged=True) is True
+
+
+def test_no_cover_when_pillar_off_axis() -> None:
+    grid = make_grid(["..C..", "....."])
+    assert has_cover(grid, (1, 0), (1, 4), ranged=True) is False
+
+
+def test_no_cover_adjacent_with_wall_behind_target() -> None:
+    grid = make_grid(["..#"])
+    assert has_cover(grid, (0, 0), (0, 1), ranged=True) is False
+
+
+def test_cover_diagonal_past_wall_vertex() -> None:
+    grid = make_grid([".#.", "#.."])
+    assert has_cover(grid, (0, 0), (1, 1), ranged=True) is True
+
+
+def test_cover_melee_uses_same_corner_rule_in_phase0() -> None:
+    grid = make_grid([".#.", "#.."])
+    assert has_cover(grid, (0, 0), (1, 1), ranged=False) is True
+    open_grid = make_grid(["...", "..."])
+    assert has_cover(open_grid, (0, 0), (1, 1), ranged=False) is False
+
+
+def test_cover_same_square_is_false() -> None:
+    grid = make_grid(["."])
+    assert has_cover(grid, (0, 0), (0, 0), ranged=True) is False