diff --git a/packages/win32-api/test/70.user32.test.ts b/packages/win32-api/test/70.user32.test.ts
index 7a609a87..09b569f7 100644
--- a/packages/win32-api/test/70.user32.test.ts
+++ b/packages/win32-api/test/70.user32.test.ts
@@ -20,7 +20,7 @@ import {
 } from '../src/index.js'
 
 import { calcLpszClassNotepad, calcLpszNotepad } from './config.unittest.js'
-import { user32, user32Sync } from './helper.js'
+import { assertsHwnd, user32, user32Sync } from './helper.js'
 
 
 const tmpMap = new Map<number | string | bigint, M.POINT>()
@@ -39,7 +39,7 @@ describe(fileShortPath(import.meta.url), () => {
 
       const hWnd = await user32FindWindowEx(0, 0, calcLpszNotepad, null)
       assert(hWnd)
-      assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'found no calc window')
+      assertsHwnd(hWnd)
 
       // Change title of the Calculator
       await user32.SetWindowTextW(hWnd, ucsBufferFrom(title))
@@ -54,19 +54,19 @@ describe(fileShortPath(import.meta.url), () => {
       point.x = 101
       point.y = Math.round(Math.random() * 1000000)
 
-      const adress = point.ref().address()
-      tmpMap.delete(adress)
+      const address = point.ref().address()
+      tmpMap.delete(address)
 
-      await enumWindows(enumWindowsProc, adress)
-      console.log({ adress })
+      await enumWindows(enumWindowsProc, address)
+      console.log({ address })
 
-      const point2 = tmpMap.get(adress)
+      const point2 = tmpMap.get(address)
       assert(point2, 'point2 should be got')
       if (point2) {
         assert(point.x === point2.x)
         assert(point.y === point2.y)
       }
-      tmpMap.delete(adress)
+      tmpMap.delete(address)
 
       child.kill()
       console.log({ killed: child.killed })
@@ -82,7 +82,7 @@ describe(fileShortPath(import.meta.url), () => {
       console.log(new Date().toLocaleTimeString())
 
       const hWnd = user32Sync.FindWindowExW(0, 0, calcLpszClassNotepad, null)
-      assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'found no calc window')
+      assertsHwnd(hWnd)
 
       // Change title of the Calculator
       user32Sync.SetWindowTextW(hWnd, ucsBufferFrom(title))
@@ -100,19 +100,19 @@ describe(fileShortPath(import.meta.url), () => {
       point.x = 101
       point.y = Math.round(Math.random() * 1000000)
 
-      const adress = point.ref().address()
-      tmpMap.delete(adress)
+      const address = point.ref().address()
+      tmpMap.delete(address)
 
-      await enumWindows(enumWindowsProc, adress)
-      console.log({ adress })
+      await enumWindows(enumWindowsProc, address)
+      console.log({ address })
 
-      const point2 = tmpMap.get(adress)
+      const point2 = tmpMap.get(address)
       assert(point2, 'point2 should be got')
       if (point2) {
         assert(point.x === point2.x)
         assert(point.y === point2.y)
       }
-      tmpMap.delete(adress)
+      tmpMap.delete(address)
 
       child.kill()
       console.log({ killed: child.killed })
diff --git a/packages/win32-api/test/71.find-calc-async.test.ts b/packages/win32-api/test/71.find-calc-async.test.ts
index e99d1f41..b4ebeacc 100644
--- a/packages/win32-api/test/71.find-calc-async.test.ts
+++ b/packages/win32-api/test/71.find-calc-async.test.ts
@@ -9,7 +9,7 @@ import { ucsBufferFrom, ucsBufferToString } from '../src/index.js'
 import * as UP from '../src/index.user32.js'
 
 import { calcLpszWindow } from './config.unittest.js'
-import { user32, user32Sync } from './helper.js'
+import { assertsHwnd, user32, user32Sync } from './helper.js'
 
 
 describe.skip(fileShortPath(import.meta.url), () => {
@@ -23,7 +23,7 @@ describe.skip(fileShortPath(import.meta.url), () => {
       console.log(new Date().toLocaleTimeString())
 
       const hWnd = await user32FindWindowEx(0, 0, null, calcLpszWindow)
-      assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'found no calc window')
+      assertsHwnd(hWnd)
       child.kill()
     })
 
@@ -41,7 +41,7 @@ describe.skip(fileShortPath(import.meta.url), () => {
             assert(false, err.message)
           }
 
-          assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'found no calc window')
+          assertsHwnd(hWnd)
           child.kill()
           done()
         })
@@ -70,7 +70,7 @@ async function findNSetWinTitleAsync(): Promise<void> {
   const len = title.length
   const hWnd = await user32.FindWindowExW(0, 0, null, ucsBufferFrom(calcLpszWindow))
 
-  assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'found no calc window')
+  assertsHwnd(hWnd)
   const ret = await user32.SetWindowTextW(hWnd, ucsBufferFrom(title))
   assert(ret, 'SetWindowTextW() failed')
 
@@ -88,7 +88,7 @@ async function findNSetWinTitleAsyncPartial(): Promise<void> {
   const len = title.length
   const hWnd = await u32.FindWindowExW(0, 0, null, ucsBufferFrom(calcLpszWindow))
 
-  assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'found no calc window')
+  assertsHwnd(hWnd)
   // Change title of the Calculator
   await u32.SetWindowTextW(hWnd, ucsBufferFrom(title))
 
diff --git a/packages/win32-api/test/72.find-notepad-async.test.ts b/packages/win32-api/test/72.find-notepad-async.test.ts
index 5cfa9902..3c092de9 100644
--- a/packages/win32-api/test/72.find-notepad-async.test.ts
+++ b/packages/win32-api/test/72.find-notepad-async.test.ts
@@ -9,7 +9,7 @@ import { ucsBufferToString, ucsBufferFrom } from '../src/index.js'
 import * as UP from '../src/index.user32.js'
 
 import { calcLpszClassNotepad, calcLpszNotepad } from './config.unittest.js'
-import { destroyWin, user32, user32Sync } from './helper.js'
+import { assertsHwnd, destroyWin, user32, user32Sync } from './helper.js'
 
 
 
@@ -24,7 +24,7 @@ describe(fileShortPath(import.meta.url), () => {
       console.log(new Date().toLocaleTimeString())
 
       const hWnd = await user32FindWindowEx(0, 0, calcLpszNotepad, null)
-      assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'found no calc window')
+      assertsHwnd(hWnd)
       await destroyWin(hWnd)
       child.kill()
     })
@@ -42,7 +42,7 @@ describe(fileShortPath(import.meta.url), () => {
             assert(false, err.message)
           }
 
-          assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'found no notepad window')
+          assertsHwnd(hWnd)
           child.kill()
           done()
         })
@@ -74,13 +74,13 @@ async function findNSetWinTitleAsync(): Promise<void> {
   const size = len + 1
   const hWnd = await user32.FindWindowExW(0, 0, calcLpszClassNotepad, null)
 
-  assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'found no calc window')
+  assertsHwnd(hWnd)
   const ret = await user32.SetWindowTextW(hWnd, ucsBufferFrom(title))
   assert(ret, 'SetWindowTextW() failed')
 
   const buf = Buffer.alloc(size * 2)
   await user32.GetWindowTextW(hWnd, buf, size)
-  const str = buf.toString('ucs2').replace(/\0+$/, '')
+  const str = buf.toString('ucs2').replace(/\0+$/u, '')
   assert(str === title.trim(), `title should be changed to "${title}", bug got "${str}"`)
 }
 
@@ -93,7 +93,7 @@ async function findNSetWinTitleAsyncPartial(): Promise<void> {
   const size = len + 1
   const hWnd = await u32.FindWindowExW(0, 0, calcLpszClassNotepad, null)
 
-  assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'found no calc window')
+  assertsHwnd(hWnd)
   // Change title of the Calculator
   await u32.SetWindowTextW(hWnd, ucsBufferFrom(title))
 
diff --git a/packages/win32-api/test/gdi32/202.CreateCompatibleBitmap.test.ts b/packages/win32-api/test/gdi32/202.CreateCompatibleBitmap.test.ts
index 252c3aed..e928c25e 100644
--- a/packages/win32-api/test/gdi32/202.CreateCompatibleBitmap.test.ts
+++ b/packages/win32-api/test/gdi32/202.CreateCompatibleBitmap.test.ts
@@ -1,17 +1,8 @@
 import assert from 'node:assert/strict'
 
 import { fileShortPath } from '@waiting/shared-core'
-import ref from 'ref-napi'
-import { sleep } from 'zx'
 
-import * as CS from '../../src/index.consts.js'
-import {
-  DModel as M,
-  DTypes as W,
-  DStruct as DS,
-  StructFactory,
-} from '../../src/index.js'
-import { gdi32 } from '../helper.js'
+import { assertsHwnd, gdi32 } from '../helper.js'
 
 
 describe(fileShortPath(import.meta.url), () => {
@@ -23,7 +14,7 @@ describe(fileShortPath(import.meta.url), () => {
 
       const hBitmap = await gdi32.CreateCompatibleBitmap(hdc, 100, 100)
       console.log({ hBitmap })
-      assert(hBitmap > 0)
+      assertsHwnd(hBitmap)
     })
   })
 })
diff --git a/packages/win32-api/test/helper.ts b/packages/win32-api/test/helper.ts
index 5373db3d..2bff6531 100644
--- a/packages/win32-api/test/helper.ts
+++ b/packages/win32-api/test/helper.ts
@@ -113,7 +113,8 @@ export async function createWindow(wndProc: M.WNDPROC): Promise<M.HWND> {
     ref.NULL,
   )
 
-  assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'CreateWindowExW() failed')
+  assertsHwnd(hWnd)
+
   // @FIXME timeout
   // await user32.ShowWindow(hWnd, 1)
   await user32.UpdateWindow(hWnd)
@@ -122,22 +123,25 @@ export async function createWindow(wndProc: M.WNDPROC): Promise<M.HWND> {
 }
 
 export async function changeTitle(hWnd: M.HANDLE, title: string): Promise<string> {
-  if (typeof hWnd === 'number' && hWnd > 0
-    || Buffer.isBuffer(hWnd) && ! ref.isNull(hWnd) && ref.address(hWnd)
-  ) {
+  if (typeof hWnd === 'number' && hWnd > 0) {
     // Change title of the Calculator
     const res = await user32.SetWindowTextW(hWnd, Buffer.from(title + '\0', 'ucs2'))
-    if (! res) {
-      throw new Error('changeTitle failed')
-    }
-    else {
+    if (res) {
       const tt = await getTitle(hWnd)
       return tt
     }
+    throw new Error('changeTitle failed')
   }
-  else {
-    return ''
+  else if (Buffer.isBuffer(hWnd) && ! ref.isNull(hWnd) && ref.address(hWnd)) {
+    // Change title of the Calculator
+    const res = await user32.SetWindowTextW(hWnd, Buffer.from(title + '\0', 'ucs2'))
+    if (res) {
+      const tt = await getTitle(hWnd)
+      return tt
+    }
+    throw new Error('changeTitle failed')
   }
+  return ''
 }
 
 
@@ -158,3 +162,16 @@ export async function getTitle(handle: M.HANDLE): Promise<string> {
 export function destroyWin(hWnd: M.HWND): Promise<M.BOOL> {
   return user32.DestroyWindow(hWnd)
 }
+
+
+export function assertsHwnd(hWnd: M.HWND | string | number | bigint): void {
+  if (typeof hWnd === 'string') {
+    assert(hWnd.length > 0, 'found no window')
+  }
+  else if (typeof hWnd === 'number' || typeof hWnd === 'bigint') {
+    assert(hWnd > 0, 'found no window')
+  }
+  else {
+    assert(false, 'found no window')
+  }
+}
diff --git a/packages/win32-api/test/user32/201.FindWindowEx.test.ts b/packages/win32-api/test/user32/201.FindWindowEx.test.ts
index 6c32dbb0..4093d8bd 100644
--- a/packages/win32-api/test/user32/201.FindWindowEx.test.ts
+++ b/packages/win32-api/test/user32/201.FindWindowEx.test.ts
@@ -2,18 +2,11 @@ import assert from 'node:assert/strict'
 import { spawn } from 'node:child_process'
 
 import { fileShortPath } from '@waiting/shared-core'
-import ref from 'ref-napi'
 import { sleep } from 'zx'
 
-import * as CS from '../../src/index.consts.js'
 import { user32FindWindowEx } from '../../src/index.fun.js'
-import {
-  DModel as M,
-  DTypes as W,
-  DStruct as DS,
-  StructFactory,
-} from '../../src/index.js'
 import { calcLpszNotepad } from '../config.unittest.js'
+import { assertsHwnd } from '../helper.js'
 
 
 describe(fileShortPath(import.meta.url), () => {
@@ -25,7 +18,7 @@ describe(fileShortPath(import.meta.url), () => {
 
       const hWnd = await user32FindWindowEx(0, 0, calcLpszNotepad, null)
       assert(hWnd)
-      assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'found no calc window')
+      assertsHwnd(hWnd)
 
       child.kill()
     })
diff --git a/packages/win32-api/test/user32/54.GetWindowRect.test.ts b/packages/win32-api/test/user32/54.GetWindowRect.test.ts
index 6fc2013e..20ee8aaa 100644
--- a/packages/win32-api/test/user32/54.GetWindowRect.test.ts
+++ b/packages/win32-api/test/user32/54.GetWindowRect.test.ts
@@ -12,7 +12,7 @@ import {
   StructFactory,
 } from '../../src/index.js'
 import { calcLpszWindow } from '../config.unittest.js'
-import { user32, destroyWin } from '../helper.js'
+import { user32, destroyWin, assertsHwnd } from '../helper.js'
 
 
 describe(fileShortPath(import.meta.url), () => {
@@ -23,7 +23,7 @@ describe(fileShortPath(import.meta.url), () => {
     const rect = StructFactory<M.RECT>(DS.RECT)
 
     const hWnd = await user32FindWindowEx(0, 0, null, calcLpszWindow)
-    assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'invalid hWnd')
+    assertsHwnd(hWnd)
 
     const ret = await user32.GetWindowRect(hWnd, rect.ref())
     assert(ret !== 0)
diff --git a/packages/win32-api/test/user32/55.SendMessageW.test.ts b/packages/win32-api/test/user32/55.SendMessageW.test.ts
index 8625c5f4..3dde56bd 100644
--- a/packages/win32-api/test/user32/55.SendMessageW.test.ts
+++ b/packages/win32-api/test/user32/55.SendMessageW.test.ts
@@ -14,7 +14,7 @@ import {
   StructFactory,
 } from '../../src/index.js'
 import { calcLpszWindow } from '../config.unittest.js'
-import { user32, destroyWin } from '../helper.js'
+import { user32, destroyWin, assertsHwnd } from '../helper.js'
 
 
 describe(fileShortPath(import.meta.url), () => {
@@ -30,7 +30,7 @@ describe(fileShortPath(import.meta.url), () => {
     })
 
     const hWnd = await user32FindWindowEx(0, 0, null, calcLpszWindow)
-    assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0)
+    assertsHwnd(hWnd)
 
     let ret = await user32.SendMessageW(hWnd, CS.WM_COMMAND, 1000, 3)
     assert(ret === 0)
@@ -44,7 +44,7 @@ describe(fileShortPath(import.meta.url), () => {
     await sleep(1500)
 
     const hWnd = await user32FindWindowEx(0, 0, null, calcLpszWindow)
-    assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0)
+    assertsHwnd(hWnd)
 
     const copyData = StructFactory<M.COPYDATASTRUCT>(DS.COPYDATASTRUCT)
     const msgBuff = Buffer.from('foo\0', 'ucs2')
diff --git a/packages/win32-api/test/user32/56.SendMessageW.SETTEXT.test.ts b/packages/win32-api/test/user32/56.SendMessageW.SETTEXT.test.ts
index d574024e..f65a0ede 100644
--- a/packages/win32-api/test/user32/56.SendMessageW.SETTEXT.test.ts
+++ b/packages/win32-api/test/user32/56.SendMessageW.SETTEXT.test.ts
@@ -12,7 +12,7 @@ import {
   calcLpszNotepad,
   calcLpszNotepadEdit,
 } from '../config.unittest.js'
-import { user32, destroyWin } from '../helper.js'
+import { user32, destroyWin, assertsHwnd } from '../helper.js'
 
 
 describe(fileShortPath(import.meta.url), () => {
@@ -22,10 +22,10 @@ describe(fileShortPath(import.meta.url), () => {
     await sleep(1500)
 
     const hWnd = await user32FindWindowEx(0, 0, calcLpszNotepad, null)
-    assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0)
+    assertsHwnd(hWnd)
 
     const hWndEdit = await user32FindWindowEx(hWnd, 0, calcLpszNotepadEdit, null)
-    assert((typeof hWndEdit === 'string' && hWndEdit.length > 0) || hWndEdit > 0)
+    assertsHwnd(hWndEdit)
 
     const txt = 'Hello World.' + Math.random().toString()
     const msgBuff = ucsBufferFrom(txt)
diff --git a/packages/win32-api/test/user32/57.SendMessageW.GETTEXT.test.ts b/packages/win32-api/test/user32/57.SendMessageW.GETTEXT.test.ts
index 807cf328..c294f1c9 100644
--- a/packages/win32-api/test/user32/57.SendMessageW.GETTEXT.test.ts
+++ b/packages/win32-api/test/user32/57.SendMessageW.GETTEXT.test.ts
@@ -12,7 +12,7 @@ import {
   calcLpszNotepad,
   calcLpszNotepadEdit,
 } from '../config.unittest.js'
-import { user32, destroyWin } from '../helper.js'
+import { user32, destroyWin, assertsHwnd } from '../helper.js'
 
 
 describe(fileShortPath(import.meta.url), () => {
@@ -22,10 +22,10 @@ describe(fileShortPath(import.meta.url), () => {
     await sleep(1500)
 
     const hWnd = await user32FindWindowEx(0, 0, calcLpszNotepad, null)
-    assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0)
+    assertsHwnd(hWnd)
 
     const hWndEdit = await user32FindWindowEx(hWnd, 0, calcLpszNotepadEdit, null)
-    assert((typeof hWndEdit === 'string' && hWndEdit.length > 0) || hWndEdit > 0)
+    assertsHwnd(hWndEdit)
 
     const txt = 'Hello World.' + Math.random().toString()
     const msgBuff = ucsBufferFrom(txt)
diff --git a/packages/win32-api/test/user32/60.FlashWindowEx.test.ts b/packages/win32-api/test/user32/60.FlashWindowEx.test.ts
index 8226f8da..4da3bed9 100644
--- a/packages/win32-api/test/user32/60.FlashWindowEx.test.ts
+++ b/packages/win32-api/test/user32/60.FlashWindowEx.test.ts
@@ -15,7 +15,7 @@ import {
   StructFactory,
 } from '../../src/index.js'
 import { calcLpszNotepad } from '../config.unittest.js'
-import { user32, destroyWin } from '../helper.js'
+import { user32, destroyWin, assertsHwnd } from '../helper.js'
 
 
 describe(fileShortPath(import.meta.url), () => {
@@ -26,7 +26,7 @@ describe(fileShortPath(import.meta.url), () => {
       await sleep(1000)
 
       const hWnd = await user32FindWindowEx(0, 0, calcLpszNotepad, null)
-      assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0)
+      assertsHwnd(hWnd)
 
       const pfwi = StructFactory<M.FLASHWINFO>(DS.FLASHWINFO)
       pfwi.cbSize = pfwi.ref().byteLength
@@ -47,7 +47,7 @@ describe(fileShortPath(import.meta.url), () => {
       await sleep(1000)
 
       const hWnd = await user32FindWindowEx(0, 0, calcLpszNotepad, null)
-      assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0)
+      assertsHwnd(hWnd)
 
       const pfwi = StructFactory<M.FLASHWINFO>(DS.FLASHWINFO)
       pfwi.cbSize = pfwi.ref().byteLength
diff --git a/packages/win32-api/test/user32/61.FlashWindow.test.ts b/packages/win32-api/test/user32/61.FlashWindow.test.ts
index 44b6105b..14c3de6d 100644
--- a/packages/win32-api/test/user32/61.FlashWindow.test.ts
+++ b/packages/win32-api/test/user32/61.FlashWindow.test.ts
@@ -8,7 +8,7 @@ import { sleep } from 'zx'
 // import * as CS from '../../src/index.consts.js'
 import { user32FindWindowEx } from '../../src/index.fun.js'
 import { calcLpszNotepad } from '../config.unittest.js'
-import { user32, destroyWin } from '../helper.js'
+import { user32, destroyWin, assertsHwnd } from '../helper.js'
 
 
 describe(fileShortPath(import.meta.url), () => {
@@ -19,7 +19,7 @@ describe(fileShortPath(import.meta.url), () => {
       await sleep(1000)
 
       const hWnd = await user32FindWindowEx(0, 0, calcLpszNotepad, null)
-      assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0)
+      assertsHwnd(hWnd)
 
       const state = await user32.FlashWindow(hWnd, 1)
       assert(state > 0)
@@ -37,7 +37,7 @@ describe(fileShortPath(import.meta.url), () => {
       await sleep(1000)
 
       const hWnd = await user32FindWindowEx(0, 0, calcLpszNotepad, null)
-      assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0)
+      assertsHwnd(hWnd)
 
       const state = await user32.FlashWindow(hWnd, 0)
       assert(state > 0)
diff --git a/packages/win32-api/test/user32/63.IsIconic.test.ts b/packages/win32-api/test/user32/63.IsIconic.test.ts
index 299b291b..2cf5bb98 100644
--- a/packages/win32-api/test/user32/63.IsIconic.test.ts
+++ b/packages/win32-api/test/user32/63.IsIconic.test.ts
@@ -6,7 +6,7 @@ import { sleep } from 'zx'
 
 import { user32FindWindowEx } from '../../src/index.fun.js'
 import { calcLpszWindow } from '../config.unittest.js'
-import { user32, destroyWin } from '../helper.js'
+import { user32, destroyWin, assertsHwnd } from '../helper.js'
 
 
 describe(fileShortPath(import.meta.url), () => {
@@ -15,7 +15,7 @@ describe(fileShortPath(import.meta.url), () => {
     await sleep(1500)
 
     const hWnd = await user32FindWindowEx(0, 0, null, calcLpszWindow)
-    assert((typeof hWnd === 'string' && hWnd.length > 0) || hWnd > 0, 'invalid hWnd')
+    assertsHwnd(hWnd)
 
     assert(! await user32.IsIconic(hWnd))
     await user32.ShowWindow(hWnd, 2) // minimize
diff --git a/packages/win32-api/test/winspool/503.GetPrinter.test.ts b/packages/win32-api/test/winspool/503.GetPrinter.test.ts
index 9233bef6..067d149b 100644
--- a/packages/win32-api/test/winspool/503.GetPrinter.test.ts
+++ b/packages/win32-api/test/winspool/503.GetPrinter.test.ts
@@ -46,7 +46,7 @@ describe(fileShortPath(import.meta.url), () => {
       }
     })
 
-    it.only('Level 4', async () => {
+    it('Level 4', async () => {
       const pname = await winspoolGetDefaultPrinter()
       assert(pname)
       const hWnd = await winspoolOpenPrinter(pname)