Make test failure messages more verbose (and thus useful to testing operators).

client/site_tests/hardware_GPIOSwitches/hardware_GPIOSwitches.py

Index: client/site_tests/hardware_GPIOSwitches/hardware_GPIOSwitches.py
diff --git a/client/site_tests/hardware_GPIOSwitches/hardware_GPIOSwitches.py b/client/site_tests/hardware_GPIOSwitches/hardware_GPIOSwitches.py
index bc35e026ff50c2f2436ff362f72230e1c785941a..0b2878ccbbe08db24b288ed6b4e555de42b5eab6 100644
--- a/client/site_tests/hardware_GPIOSwitches/hardware_GPIOSwitches.py
+++ b/client/site_tests/hardware_GPIOSwitches/hardware_GPIOSwitches.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+#
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
@@ -25,7 +27,10 @@ class hardware_GPIOSwitches(test.test):
         if os.path.exists(gpio_root):
             utils.system("rm -rf %s" % gpio_root)
         utils.system("mkdir %s" % (gpio_root))
-        utils.system("/usr/sbin/gpio_setup")
+        try:
+            utils.system("/usr/sbin/gpio_setup")
+        except error.CmdError:
+            raise error.TestNAError('GPIO setup failed\nGPIO 設定失敗')
         self._gpio_root=gpio_root
 
     def run_once(self):