FileUtils.copyFile zeros out the file if source file is the same as destination file

public void testCopyFileOnSameFile()
        throws IOException
    {
        String content= "ggrgreeeeeeeeeeeeeeeeeeeeeeeoierjgioejrgiojregioejrgufcdxivbsdibgfizgerfyaezgv!zeez";
        final File theFile = File.createTempFile( "test", ".txt");
        FileUtils.fileAppend( theFile.getAbsolutePath(), content);

        assertTrue( theFile.length() > 0);
        // Now copy file over itself
        FileUtils.copyFile( theFile, theFile);

        // This should not fail
        assertTrue( theFile.length() > 0);
   }