diff --git a/tests/core/game-host.test.ts b/tests/core/game-host.test.ts
index f365a78..4d250ec 100644
--- a/tests/core/game-host.test.ts
+++ b/tests/core/game-host.test.ts
@@ -342,4 +342,72 @@ describe('GameHost', () => {
             expect(host.activePromptSchema.value).toBeNull();
         });
     });
+
+    describe('full game', () => {
+        it('should run a complete game of tic-tac-toe with X winning diagonally', async () => {
+            const { host } = createTestHost();
+
+            // Initial state
+            expect(host.state.value.currentPlayer).toBe('X');
+            expect(host.state.value.winner).toBeNull();
+            expect(host.state.value.turn).toBe(0);
+            expect(Object.keys(host.state.value.parts).length).toBe(0);
+
+            // X wins diagonally: (0,0), (1,1), (2,2)
+            // O plays: (0,1), (2,1)
+            const moves = [
+                'play X 0 0', // turn 1: X
+                'play O 0 1', // turn 2: O
+                'play X 1 1', // turn 3: X
+                'play O 2 1', // turn 4: O
+                'play X 2 2', // turn 5: X wins!
+            ];
+
+            // Track prompt events in a queue
+            const promptEvents: PromptEvent[] = [];
+            host.commands.on('prompt', (e) => {
+                promptEvents.push(e);
+            });
+
+            // Start setup command (runs game loop until completion)
+            const setupPromise = host.commands.run('setup');
+
+            for (let i = 0; i < moves.length; i++) {
+                // Wait until the next prompt event arrives
+                while (i >= promptEvents.length) {
+                    await new Promise(r => setTimeout(r, 10));
+                }
+
+                const promptEvent = promptEvents[i];
+                expect(promptEvent.schema.name).toBe('play');
+
+                // Submit the move
+                const error = host.onInput(moves[i]);
+                expect(error).toBeNull();
+            }
+
+            // Wait for setup to complete (game ended with winner)
+            const result = await setupPromise;
+            expect(result.success).toBe(true);
+            if (result.success) {
+                expect(result.result.winner).toBe('X');
+            }
+
+            // Final state checks
+            expect(host.state.value.winner).toBe('X');
+            expect(host.state.value.currentPlayer).toBe('X');
+            expect(Object.keys(host.state.value.parts).length).toBe(5);
+
+            // Verify winning diagonal
+            const parts = Object.values(host.state.value.parts);
+            const xPieces = parts.filter(p => p.player === 'X');
+            expect(xPieces).toHaveLength(3);
+            expect(xPieces.some(p => JSON.stringify(p.position) === JSON.stringify([0, 0]))).toBe(true);
+            expect(xPieces.some(p => JSON.stringify(p.position) === JSON.stringify([1, 1]))).toBe(true);
+            expect(xPieces.some(p => JSON.stringify(p.position) === JSON.stringify([2, 2]))).toBe(true);
+
+            host.dispose();
+            expect(host.status.value).toBe('disposed');
+        });
+    });
 });