update

tests/unit/audit-rate.test.js

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+// P2-7（audit）：app:open-config-dir 高频调用检测。
+//
+// 设计：main/audit-rate.js 提供 createAuditRateTracker({ windowMs, threshold, now })
+// 返回 hit(key) → { count, exceeded }。滑动窗口按 key 计数：
+//   - 窗口内 count ≤ threshold → exceeded=false
+//   - 窗口内 count > threshold → exceeded=true（调用方据此 console.warn）
+//   - 超过 windowMs 的旧记录自动过期
+//
+// now 可注入（Date.now 默认），方便单测推进时间。
+
+import { describe, it, expect } from 'vitest';
+const { createAuditRateTracker } = require('../../main/audit-rate.js');
+
+describe('createAuditRateTracker —— P2-7 高频调用检测', () => {
+  it('首次调用 count=1，不 exceeded', () => {
+    const t = createAuditRateTracker({ windowMs: 60_000, threshold: 5 });
+    expect(t.hit('k')).toEqual({ count: 1, exceeded: false });
+  });
+
+  it('窗口内累计到 threshold 不 exceeded，超过则 exceeded', () => {
+    let now = 1000;
+    const t = createAuditRateTracker({ windowMs: 60_000, threshold: 3, now: () => now });
+    expect(t.hit('k').exceeded).toBe(false); // 1
+    expect(t.hit('k').exceeded).toBe(false); // 2
+    expect(t.hit('k').exceeded).toBe(false); // 3
+    const fourth = t.hit('k'); // 4 > 3
+    expect(fourth.count).toBe(4);
+    expect(fourth.exceeded).toBe(true);
+  });
+
+  it('不同 key 独立计数', () => {
+    const t = createAuditRateTracker({ windowMs: 60_000, threshold: 1 });
+    t.hit('a');
+    expect(t.hit('b')).toEqual({ count: 1, exceeded: false });
+  });
+
+  it('超过 windowMs 的旧记录过期，重新计数', () => {
+    let now = 0;
+    const t = createAuditRateTracker({ windowMs: 1000, threshold: 2, now: () => now });
+    t.hit('k'); // t=0
+    t.hit('k'); // t=0, count=2
+    expect(t.hit('k').exceeded).toBe(true); // t=0, count=3
+    now = 1500; // 滑出窗口
+    expect(t.hit('k')).toEqual({ count: 1, exceeded: false });
+  });
+
+  it('边界：恰好 windowMs 的时间点视为过期（[now-window, now) 语义）', () => {
+    let now = 0;
+    const t = createAuditRateTracker({ windowMs: 1000, threshold: 1, now: () => now });
+    t.hit('k'); // t=0
+    now = 1000; // 恰好 1000ms 后
+    expect(t.hit('k')).toEqual({ count: 1, exceeded: false });
+  });
+
+  it('默认 now=Date.now，不抛错', () => {
+    const t = createAuditRateTracker({ windowMs: 1000, threshold: 1 });
+    expect(() => t.hit('k')).not.toThrow();
+  });
+});