From 0fa09156df577f5632c09c70cbec9a43614581f8 Mon Sep 17 00:00:00 2001
From: Dhanjit Das <dhanjit@users.noreply.github.com>
Date: Thu, 1 Jan 2026 10:44:28 +0530
Subject: [PATCH] Test: Expand AI test suite with chain reactions and full game
 simulation

---
 tests/ai.test.js | 60 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/tests/ai.test.js b/tests/ai.test.js
index 5305431b..671aa48d 100644
--- a/tests/ai.test.js
+++ b/tests/ai.test.js
@@ -62,4 +62,64 @@ describe('DotDot AI Logic', () => {
         expect(isDangerousH).toBe(false);
         expect(isDangerousV).toBe(false);
     });
+
+    test('AI takes multiple squares if possible (Chain Reaction)', () => {
+        // Setup: Two squares side-by-side that can be chained.
+        // Sq(0,0) needs H(1,0). 
+        // Sq(0,1) needs H(1,1).
+
+        game.horizontalLines[0][0] = true;
+        game.verticalLines[0][0] = true;
+        game.verticalLines[0][1] = true;
+
+        game.horizontalLines[0][1] = true;
+        game.verticalLines[0][2] = true;
+
+        // If we place H(1,0), we complete Sq(0,0).
+        // Does AI see both? Yes, `findScoringMoves` returns all.
+
+        const move = ai.getMove(game);
+        expect(ai.doesMoveCompleteSquare(game, move)).toBe(true);
+    });
+
+    test('Full Game Simulation (AI vs Random)', () => {
+        // Ensure AI doesn't crash or freeze throughout a whole game.
+        const simGame = new GameState(5, 5); // 5x5 grid
+        let moves = 0;
+        const maxMoves = 1000; // Safety break
+
+        while (!simGame.gameOver && moves < maxMoves) {
+            moves++;
+            const player = simGame.getCurrentPlayer();
+            let move;
+
+            if (player === 'P1') {
+                // Random player logic for test
+                const available = ai.getAllAvailableMoves(simGame);
+                // Simple random move if available
+                if (available.length > 0) {
+                    move = available[Math.floor(Math.random() * available.length)];
+                } else {
+                    break; // Game over or error
+                }
+            } else {
+                // AI
+                move = ai.getMove(simGame);
+            }
+
+            if (!move) break;
+
+            const result = simGame.placeLine(move.type, move.r, move.c);
+            if (!result.success) {
+                // This might happen if AI returns a move that is already taken?
+                // Should not happen with valid AI.
+                throw new Error(`Invalid move generated by ${player}: ${JSON.stringify(move)}`);
+            }
+        }
+
+        expect(simGame.gameOver).toBe(true);
+        // Scores check?
+        const total = simGame.scores['P1'] + simGame.scores['P2'];
+        expect(total).toBe(16); // 4x4 squares = 16
+    });
 });