diff --git a/docs/gamification-server-plan.md b/docs/gamification-server-plan.md
index b2c4bfd..cd0f687 100644
--- a/docs/gamification-server-plan.md
+++ b/docs/gamification-server-plan.md
@@ -59,13 +59,14 @@
 | G2-4 | 将连续学习改为按挑战组完成计算 | [x] | 每天至少完成 1 组挑战才更新 streak，不再依赖当天正确题数阈值 |
 | G2-5 | 实现连续学习里程碑奖励 | [x] | 3/7/14/30/100 天奖励可发放且不可重复领取 |
 | G2-6 | 实现每日首次进入送红心 | [x] | 每日首次 bootstrap 或专用 check-in 最多补 1 颗，不超过上限 |
-| G2-7 | 添加 XP/streak 测试 | [ ] | 覆盖等级边界、首次知识卡、完成组奖励、全对奖励、看解析奖励、连续学习保护 |
+| G2-7 | 添加 XP/streak 测试 | [x] | 覆盖等级边界、首次知识卡、完成组奖励、全对奖励、看解析奖励、连续学习保护 |
 
 验证记录（2026-05-13）：G2-2 已通过 `./node_modules/.bin/tsc --noEmit` 和 `./node_modules/.bin/eslint .`；`bun` 当前 shell 不在 PATH，`./node_modules/.bin/vitest run` 启动阶段被 macOS 拒绝加载未签名的 `@rolldown/binding-darwin-x64` 原生 binding，需修复本地依赖安装或签名后复跑。
 验证记录（2026-05-13）：G2-3 已通过 `./node_modules/.bin/tsc --noEmit` 和 `./node_modules/.bin/eslint .`；定向运行 `./node_modules/.bin/vitest run src/__tests__/services/progress/xp-service.test.ts src/__tests__/services/learning/challenge-service.test.ts` 仍在启动阶段被同一个 `@rolldown/binding-darwin-x64` 原生 binding 签名问题阻塞。
 验证记录（2026-05-13）：G2-4 已通过 `./node_modules/.bin/tsc --noEmit` 和 `./node_modules/.bin/eslint .`；定向运行 `./node_modules/.bin/vitest run src/__tests__/services/progress/streak-service.test.ts src/__tests__/services/learning/challenge-service.test.ts` 仍在启动阶段被同一个 `@rolldown/binding-darwin-x64` 原生 binding 签名问题阻塞。
 验证记录（2026-05-13）：G2-5 已通过 `./node_modules/.bin/tsc --noEmit` 和 `./node_modules/.bin/eslint .`；定向运行 `./node_modules/.bin/vitest run src/__tests__/services/progress/streak-service.test.ts src/__tests__/services/learning/challenge-service.test.ts` 仍在启动阶段被同一个 `@rolldown/binding-darwin-x64` 原生 binding 签名问题阻塞。
 验证记录（2026-05-13）：G2-6 已通过 `./node_modules/.bin/tsc --noEmit` 和 `./node_modules/.bin/eslint .`；定向运行 `./node_modules/.bin/vitest run src/__tests__/services/learning/progress-summary-service.test.ts` 仍在启动阶段被同一个 `@rolldown/binding-darwin-x64` 原生 binding 签名问题阻塞。
+验证记录（2026-05-13）：G2-7 已通过 `./node_modules/.bin/tsc --noEmit` 和 `./node_modules/.bin/eslint .`；定向运行 `./node_modules/.bin/vitest run src/__tests__/services/progress/xp-service.test.ts src/__tests__/services/progress/streak-service.test.ts src/__tests__/services/learning/challenge-service.test.ts src/__tests__/services/learning/progress-summary-service.test.ts` 仍在启动阶段被同一个 `@rolldown/binding-darwin-x64` 原生 binding 签名问题阻塞。
 
 ## Phase G3：金币、商店和道具
 
diff --git a/src/__tests__/services/progress/streak-service.test.ts b/src/__tests__/services/progress/streak-service.test.ts
index b42b5fe..acc58e0 100644
--- a/src/__tests__/services/progress/streak-service.test.ts
+++ b/src/__tests__/services/progress/streak-service.test.ts
@@ -1,6 +1,7 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 import { db } from '../../../db/client.js';
 import {
+  freezeStreak,
   getStreakMilestoneReward,
   grantStreakMilestoneReward,
   updateStreakForCompletedChallenge,
@@ -143,4 +144,22 @@ describe('Streak service — completed challenge updates', () => {
     expect(rewards).toEqual([]);
     expect(db.insert).not.toHaveBeenCalled();
   });
+
+  it('freezes streak protection for today without incrementing streak days', async () => {
+    selectQueue([
+      [{ streakDays: 12 }],
+    ]);
+    const update = mockUpdate();
+
+    const result = await freezeStreak('user-1');
+
+    expect(result).toEqual({
+      days: 12,
+      lastDate: new Date().toISOString().slice(0, 10),
+      frozen: true,
+    });
+    expect(update.set).toHaveBeenCalledWith(expect.objectContaining({
+      streakLastDate: expect.any(Object),
+    }));
+  });
 });
diff --git a/src/__tests__/services/progress/xp-service.test.ts b/src/__tests__/services/progress/xp-service.test.ts
index faa30f9..5f8758e 100644
--- a/src/__tests__/services/progress/xp-service.test.ts
+++ b/src/__tests__/services/progress/xp-service.test.ts
@@ -90,6 +90,12 @@ describe('XP service', () => {
         amount: 15,
         title: '首次知识卡 +15 XP',
       });
+      expect(createXpReward('review_explanation')).toEqual({
+        type: 'xp',
+        source: 'review_explanation',
+        amount: 3,
+        title: '查看解析 +3 XP',
+      });
     });
   });
 });