user32/tests: Skip DefWindowProc tests on Vista+.

dlls/user32/tests/class.c

@@ -617,6 +617,7 @@ static void test_builtinproc(void)
     static const WCHAR classW[] = {'d','e','f','t','e','s','t',0};
     WCHAR unistring[] = {0x142, 0x40e, 0x3b4, 0};  /* a string that would be destroyed by a W->A->W conversion */
     WNDPROC pDefWindowProcA, pDefWindowProcW;
+    WNDPROC pNtdllDefWindowProcA, pNtdllDefWindowProcW;
     WNDPROC oldproc;
     WNDCLASSEXA cls;  /* the memory layout of WNDCLASSEXA and WNDCLASSEXW is the same */
     WCHAR buf[128];
@@ -626,7 +627,17 @@ static void test_builtinproc(void)
 
     pDefWindowProcA = (void *)GetProcAddress(GetModuleHandle("user32.dll"), "DefWindowProcA");
     pDefWindowProcW = (void *)GetProcAddress(GetModuleHandle("user32.dll"), "DefWindowProcW");
-
+    pNtdllDefWindowProcA = (void *)GetProcAddress(GetModuleHandle("ntdll.dll"), "NtdllDefWindowProc_A");
+    pNtdllDefWindowProcW = (void *)GetProcAddress(GetModuleHandle("ntdll.dll"), "NtdllDefWindowProc_W");
+
+    /* On Vista+, the user32.dll export DefWindowProcA/W is forwarded to  */
+    /* ntdll.NtdllDefWindowProc_A/W. However, the wndproc returned by     */
+    /* GetClassLong/GetWindowLong points to an unexported user32 function */
+    if (pDefWindowProcA == pNtdllDefWindowProcA &&
+        pDefWindowProcW == pNtdllDefWindowProcW)
+        skip("user32.DefWindowProcX forwarded to ntdll.NtdllDefWindowProc_X\n");
+    else
+    {
         for (i = 0; i < 4; i++)
         {
             ZeroMemory(&cls, sizeof(cls));
@@ -666,6 +677,7 @@ static void test_builtinproc(void)
             DestroyWindow(hwnd);
             UnregisterClass((LPSTR)(DWORD_PTR)atom, GetModuleHandle(NULL));
         }
+    }
 
     /* built-in winproc - window A/W type automatically detected */
     ZeroMemory(&cls, sizeof(cls));