Hit tiles: positions round half to even (PRTS 作战机制); enemies held just inside the field edge

test/sim/feedback5-raid-own-board.test.js

@@ -177,8 +177,8 @@ for (const kind of ['boss', 'hidden']) for (const side of ['L', 'R']) {
   });
 }
 
-test('#475: even buildable hand, temporary-storage, side-margin and off-rect tiles remain invalid Raid landings', () => {
-  for (const pos of [[0, 3], [1, 3], [0, 17], [1, 17], [3, 1], [3, 19], [6, 17]]) {
+test('#475: even buildable hand, temporary-storage and side-margin tiles remain invalid Raid landings', () => {
+  for (const pos of [[0, 3], [1, 3], [0, 17], [1, 17], [3, 1], [3, 19]]) {
     const h = emptyHalfLanding({ pos, ranged: true });
     const u = h.unit('probe'), home = [u.tileR, u.tileC];
     h.run(11);
@@ -187,6 +187,16 @@ test('#475: even buildable hand, temporary-storage, side-margin and off-rect til
   }
 });
 
+test('#475: no Raid lands off the rectangle — an enemy spawned on (6,17) is held on the edge row and stands on (5,17)', () => {
+  // Battle._clampPos keeps an enemy FIELD_EDGE_INSET inside the field, so its tile is the edge tile (body.js); the Raid
+  // lands where it would for an enemy put on (5,17), never on row 6
+  const h = emptyHalfLanding({ pos: [6, 17], ranged: true });
+  const u = h.unit('probe');
+  h.run(11);
+  assert.deepEqual([u.tileR, u.tileC], [5, 17]);
+  checkInvariants(h.b);
+});
+
 test('#475: empty-half Raid still respects melee/high-ground, water and occupied/downed-unit reservations', () => {
   for (const glyph of ['h', 'd']) {
     const h = emptyHalfLanding({ pos: [3, 17], glyph });