first commit

tests/unit/auth/activity.test.ts

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+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { activity } from '../../../src/auth/activity'
+
+describe('user activity', () => {
+  beforeEach(() => localStorage.clear())
+
+  it('records real input at most once every 30 seconds', () => {
+    const checkRefresh = vi.fn()
+    const now = vi.spyOn(Date, 'now').mockReturnValue(1_000_000)
+    const stop = activity.start(checkRefresh)
+    window.dispatchEvent(new MouseEvent('click'))
+    expect(activity.get()).toBe(1_000_000)
+    now.mockReturnValue(1_010_000)
+    window.dispatchEvent(new KeyboardEvent('keydown'))
+    expect(activity.get()).toBe(1_000_000)
+    now.mockReturnValue(1_031_000)
+    window.dispatchEvent(new TouchEvent('touchstart'))
+    expect(activity.get()).toBe(1_031_000)
+    expect(checkRefresh).toHaveBeenCalledTimes(3)
+    stop()
+  })
+
+  it('checks on foreground resume without treating visibility as activity', () => {
+    const checkRefresh = vi.fn()
+    const stop = activity.start(checkRefresh)
+    document.dispatchEvent(new Event('visibilitychange'))
+    expect(checkRefresh).toHaveBeenCalledOnce()
+    expect(activity.get()).toBe(0)
+    window.dispatchEvent(new PopStateEvent('popstate'))
+    expect(activity.get()).toBeGreaterThan(0)
+    stop()
+  })
+})