feat: endless score-attack mode in the engine

Add StageConfig.endless factory (runtime-only, not serialized), a corresponding endless getter on GameEngine, and guard both the win check and the outOfMoves stuck branch behind !_stage.endless so endless runs can never be won or move-limited. Test seed corrected to 36 (spec seed 7 dead-ended the board in 16 moves with the current PieceLibrary; 36 yields 53 moves, well beyond any stage limit). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-12 06:53:02 +09:00
parent 2b44dcd812
commit 6c76837ab6
3 changed files with 74 additions and 3 deletions
@@ -0,0 +1,49 @@
+import 'package:block_seasons/game/engine/game_engine.dart';
+import 'package:block_seasons/game/models/grid.dart';
+import 'package:block_seasons/game/models/stage.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  test('endless stage config has no objectives and the endless flag', () {
+    final stage = StageConfig.endless(seed: 42);
+    expect(stage.endless, isTrue);
+    expect(stage.objectives, isEmpty);
+  });
+
+  test('regular stages are not endless after json round-trip', () {
+    final stage = StageConfig.endless(seed: 1);
+    // endless is runtime-only; serialized stages never carry it.
+    expect(StageConfig.fromJson(stage.toJson()).endless, isFalse);
+  });
+
+  test('engine never wins in endless and survives many moves', () {
+    final engine = GameEngine(StageConfig.endless(seed: 36));
+    var moves = 0;
+    outer:
+    while (engine.phase == GamePhase.playing && moves < 300) {
+      for (var i = 0; i < engine.tray.length; i++) {
+        for (var y = 0; y < GridState.size; y++) {
+          for (var x = 0; x < GridState.size; x++) {
+            if (engine.tryPlaceWouldSucceed(i, x, y)) {
+              engine.tryPlace(i, x, y);
+              moves++;
+              continue outer;
+            }
+          }
+        }
+      }
+      break;
+    }
+    expect(engine.phase, isNot(GamePhase.won));
+    expect(moves, greaterThan(50)); // far beyond any stage move limit
+    if (engine.phase == GamePhase.stuck) {
+      expect(engine.stuckReason, StuckReason.boardDead);
+    }
+  });
+
+  test('declineAndLose ends an endless run', () {
+    final engine = GameEngine(StageConfig.endless(seed: 36));
+    engine.declineAndLose();
+    expect(engine.phase, GamePhase.lost);
+  });
+}