diff --git a/filesystem_copier_action_unittest.cc b/filesystem_copier_action_unittest.cc
index cb9c817..62b39a6 100644
--- a/filesystem_copier_action_unittest.cc
+++ b/filesystem_copier_action_unittest.cc
@@ -146,9 +146,15 @@
 
   ScopedLoopbackDeviceBinder a_dev_releaser(a_loop_file, &a_dev);
   ScopedLoopbackDeviceBinder b_dev_releaser(b_loop_file, &b_dev);
+  if (!(a_dev_releaser.is_bound() && b_dev_releaser.is_bound())) {
+    ADD_FAILURE();
+    return false;
+  }
 
-  LOG(INFO) << "copying: " << a_loop_file << " -> " << b_loop_file
-            << ", " << kLoopFileSize << " bytes";
+  LOG(INFO) << "copying: "
+            << a_loop_file << " (" << a_dev << ") -> "
+            << b_loop_file << " (" << b_dev << ", "
+            << kLoopFileSize << " bytes";
   bool success = true;
 
   // Set up the action objects
diff --git a/test_utils.h b/test_utils.h
index 6d85157..8305c14 100644
--- a/test_utils.h
+++ b/test_utils.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
@@ -146,6 +146,8 @@
     return dev_;
   }
 
+  bool is_bound() const { return is_bound_; }
+
  private:
   std::string dev_;
   bool is_bound_;