wintun: Introduce new package for obscuring Windows bits

tun/wintun/setupapi/zsetupapi_windows_test.go

@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package setupapi
+
+import (
+	"syscall"
+	"testing"
+
+	"golang.org/x/sys/windows"
+)
+
+func TestSetupDiDestroyDeviceInfoList(t *testing.T) {
+	err := SetupDiDestroyDeviceInfoList(DevInfo(windows.InvalidHandle))
+	if errWin, ok := err.(syscall.Errno); !ok || errWin != 6 /*ERROR_INVALID_HANDLE*/ {
+		t.Errorf("SetupDiDestroyDeviceInfoList(nil, ...) should fail with ERROR_INVALID_HANDLE")
+	}
+}