Match whole path components in DevicePathToDriveLetterPath(). Add tests.

base/win/win_api_interface.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Class WinApiInterface provides a way to mock windows API calls in
+// unit tests.  Functions can call members of class WinApiInterface
+// instead of Windows API functions, and subclasses of WinApiInterface
+// can be used by tests.  Members of this class should do nothing except
+// calling the real API call they are named after.
+//
+// Tests should be written with the assumption that new calls will be
+// added over time.  For example, if you use gmock to create a strict mock
+// of WinApiInterface, do not make any other windows API calls in the code
+// under test.
+
+#ifndef BASE_WIN_WIN_API_INTERFACE_H_
+#define BASE_WIN_WIN_API_INTERFACE_H_
+
+#include <windows.h>
+
+namespace base {
+namespace win {
+
+class WinApiInterface {
+ public:
+  virtual DWORD QueryDosDevice(LPCTSTR lpDeviceName,
+                               LPTSTR lpTargetPath,
+                               DWORD ucchMax) {
+    return ::QueryDosDevice(lpDeviceName, lpTargetPath, ucchMax);
+  }
+
+  virtual DWORD GetLogicalDriveStrings(DWORD nBufferLength,
+                                       LPTSTR lpBuffer) {
+    return ::GetLogicalDriveStrings(nBufferLength, lpBuffer);
+  }
+
+  static WinApiInterface* GetInstance();

[rvargas (doing something else), 2012/01/11 22:26:26]

This has to be exported.

+};
+
+}  // namespace win
+}  // namespace base
+
+#endif  // BASE_WIN_WIN_API_INTERFACE_H_