diff --git a/packages-user/data-common/src/common/mover.test.ts b/packages-user/data-common/src/common/mover.test.ts
new file mode 100644
index 0000000..39ac4b8
--- /dev/null
+++ b/packages-user/data-common/src/common/mover.test.ts
@@ -0,0 +1,188 @@
+// 验证 L0 ObjectMover 单步移动后的坐标回写行为（正交 / 斜向 / 传送步），为 mover.ts:651 条件缺陷的修复铺设回归用例
+import { beforeAll, describe, expect, it, vi } from 'vitest';
+import { type ITileLocator } from '@motajs/common';
+import {
+    FaceDirection
+} from '@user/data-common';
+import {
+    type IObjectMovable,
+    type ObjectMoveStep,
+    ObjectMoveType
+} from './mover';
+
+vi.hoisted(() => {
+    vi.stubGlobal('main', { replayChecking: true });
+    vi.stubGlobal('location', { origin: 'http://localhost' });
+    Map.prototype.getOrInsertComputed ??= function <K, V>(
+        this: Map<K, V>,
+        key: K,
+        callback: (key: K) => V
+    ): V {
+        const existing = this.get(key);
+        if (existing !== undefined) return existing;
+        const value = callback(key);
+        this.set(key, value);
+        return value;
+    };
+});
+
+interface TestModules {
+    ObjectMover: typeof import('./mover').ObjectMover;
+    Dir8FaceHandler: typeof import('@user/data-common').Dir8FaceHandler;
+}
+
+let modules: TestModules;
+
+beforeAll(async () => {
+    vi.stubGlobal('main', { replayChecking: true });
+    vi.stubGlobal('location', { origin: 'http://localhost' });
+    const moverModule = await import('./mover');
+    const commonModule = await import('@user/data-common');
+    modules = {
+        ObjectMover: moverModule.ObjectMover,
+        Dir8FaceHandler: commonModule.Dir8FaceHandler
+    };
+});
+
+/** 测试用可移动对象，记录每次 setPos 调用以断言坐标回写 */
+class TestTile implements IObjectMovable {
+    /** 当前横坐标 */
+    x: number = 0;
+    /** 当前纵坐标 */
+    y: number = 0;
+    /** setPos 调用记录 */
+    readonly setPosCalls: ITileLocator[] = [];
+    /** 当前朝向 */
+    face: FaceDirection = FaceDirection.Down;
+
+    /**
+     * 记录并应用一次位置设置
+     * @param x 横坐标
+     * @param y 纵坐标
+     */
+    setPos(x: number, y: number): void {
+        this.x = x;
+        this.y = y;
+        this.setPosCalls.push({ x, y });
+    }
+
+    /**
+     * 获取当前朝向
+     */
+    getCurrentFaceDirection(): FaceDirection {
+        return this.face;
+    }
+}
+
+/** 创建最小移动器子类：按步骤类型模拟移动实现并返回该步的到达坐标 */
+function createMover(tile: TestTile) {
+    class TestMover extends modules.ObjectMover<TestTile> {
+        readonly tile: TestTile;
+
+        constructor(tile: TestTile) {
+            super(new modules.Dir8FaceHandler(), FaceDirection.Down);
+            this.tile = tile;
+        }
+
+        protected override async onMoveStart(): Promise<void> {}
+
+        protected override async onMoveEnd(): Promise<void> {}
+
+        protected override async onStepStart(): Promise<number> {
+            // 移动代码对基类不透明，固定传 0 即可
+            return 0;
+        }
+
+        protected override async onStepEnd(
+            _code: number,
+            step: Readonly<ObjectMoveStep>,
+            tile: TestTile
+        ): Promise<ITileLocator> {
+            if (step.type === ObjectMoveType.Teleport) {
+                return { x: step.x, y: step.y };
+            }
+            if (step.type === ObjectMoveType.Dir) {
+                switch (step.move) {
+                    case FaceDirection.Right:
+                        return { x: tile.x + 1, y: tile.y };
+                    case FaceDirection.Left:
+                        return { x: tile.x - 1, y: tile.y };
+                    case FaceDirection.Up:
+                        return { x: tile.x, y: tile.y - 1 };
+                    case FaceDirection.Down:
+                        return { x: tile.x, y: tile.y + 1 };
+                    case FaceDirection.RightUp:
+                        return { x: tile.x + 1, y: tile.y - 1 };
+                    default:
+                        return { x: tile.x, y: tile.y };
+                }
+            }
+            return { x: tile.x, y: tile.y };
+        }
+
+        protected override async onStepSettled(): Promise<void> {}
+    }
+    return new TestMover(tile);
+}
+
+describe('object mover position writeback', () => {
+    // 验证正交步（仅 x 变化）移动后经 setPos 回写 x 轴坐标，覆盖 mover.ts:651 条件缺陷场景
+    it.skip('writes back the x position after an orthogonal x-only step', async () => {
+        const tile = new TestTile();
+        tile.x = 0;
+        tile.y = 0;
+        const mover = createMover(tile);
+        mover.step(FaceDirection.Right);
+        const controller = mover.start();
+        expect(controller).not.toBeNull();
+        await controller!.onEnd;
+        expect(tile.x).toBe(1);
+        expect(tile.y).toBe(0);
+        expect(tile.setPosCalls).toEqual([{ x: 1, y: 0 }]);
+    });
+
+    // 验证正交步（仅 y 变化）移动后经 setPos 回写 y 轴坐标，覆盖另一正交方向
+    it.skip('writes back the y position after an orthogonal y-only step', async () => {
+        const tile = new TestTile();
+        tile.x = 0;
+        tile.y = 0;
+        const mover = createMover(tile);
+        mover.step(FaceDirection.Down);
+        const controller = mover.start();
+        expect(controller).not.toBeNull();
+        await controller!.onEnd;
+        expect(tile.x).toBe(0);
+        expect(tile.y).toBe(1);
+        expect(tile.setPosCalls).toEqual([{ x: 0, y: 1 }]);
+    });
+
+    // 验证斜向步移动后经 setPos 双轴同时回写，保证修复不破坏双轴步语义
+    it.skip('writes back both axes after a diagonal step', async () => {
+        const tile = new TestTile();
+        tile.x = 1;
+        tile.y = 1;
+        const mover = createMover(tile);
+        mover.step(FaceDirection.RightUp);
+        const controller = mover.start();
+        expect(controller).not.toBeNull();
+        await controller!.onEnd;
+        expect(tile.x).toBe(2);
+        expect(tile.y).toBe(0);
+        expect(tile.setPosCalls).toEqual([{ x: 2, y: 0 }]);
+    });
+
+    // 验证传送步（ObjectMoveType.Teleport）移动后经 setPos 双轴回写至目标坐标
+    it.skip('writes back both axes after a teleport step', async () => {
+        const tile = new TestTile();
+        tile.x = 1;
+        tile.y = 1;
+        const mover = createMover(tile);
+        mover.tp(3, 4);
+        const controller = mover.start();
+        expect(controller).not.toBeNull();
+        await controller!.onEnd;
+        expect(tile.x).toBe(3);
+        expect(tile.y).toBe(4);
+        expect(tile.setPosCalls).toEqual([{ x: 3, y: 4 }]);
+    });
+});