Add a test for multicard reader support.

client/site_tests/hardware_MultiReader/hardware_MultiReader.py

+# 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.
+
+import glob, logging, os
+
+from autotest_lib.client.bin import test, utils
+from autotest_lib.client.common_lib import error
+
+class hardware_MultiReader(test.test):
+    version = 1
+
+    def run_once(self):
+        blockdev_paths = glob.glob("/sys/block/*/removable")
+        for path in blockdev_paths:
+            removable = utils.read_one_line(path)
+            if removable == "1":
+                logging.info("Found removable block device %s",
+                             os.path.dirname(path))
+                return True
+
+        raise error.TestFail("No removable block devices are seen.")