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diff --git a/tests/plainfile.h b/tests/plainfile.h
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+/***************************************************************************
+    copyright           : (C) 2015 by Tsuda Kageyu
+    email               : tsuda.kageyu@gmail.com
+ ***************************************************************************/
+
+/***************************************************************************
+ *   This library is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU Lesser General Public License version   *
+ *   2.1 as published by the Free Software Foundation.                     *
+ *                                                                         *
+ *   This library is distributed in the hope that it will be useful, but   *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
+ *   Lesser General Public License for more details.                       *
+ *                                                                         *
+ *   You should have received a copy of the GNU Lesser General Public      *
+ *   License along with this library; if not, write to the Free Software   *
+ *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA         *
+ *   02110-1301  USA                                                       *
+ *                                                                         *
+ *   Alternatively, this file is available under the Mozilla Public        *
+ *   License Version 1.1.  You may obtain a copy of the License at         *
+ *   http://www.mozilla.org/MPL/                                           *
+ ***************************************************************************/
+
+#ifndef TAGLIB_PLAINFILE_H
+#define TAGLIB_PLAINFILE_H
+
+#include <tfile.h>
+
+using namespace TagLib;
+
+//! File subclass that gives tests access to filesystem operations
+class PlainFile : public File {
+public:
+  explicit PlainFile(FileName name) : File(name) { }
+  Tag *tag() const { return NULL; }
+  AudioProperties *audioProperties() const { return NULL; }
+  bool save() { return false; }
+  void truncate(long length) { File::truncate(length); }
+
+  ByteVector readAll() {
+    seek(0, End);
+    long end = tell();
+    seek(0);
+    return readBlock(end);
+  }
+};
+
+#endif