// Make file unreadable on Unix-like systems
        boolean isWindows = System.getProperty("os.name").toLowerCase().contains("windows");
        if (!isWindows) {
            assertTrue(lmhostsFile.setReadable(false));
        }

        when(mockConfig.getLmHostsFileName()).thenReturn(lmhostsFile.getAbsolutePath());

        if (!isWindows) {
            // Should handle IOException gracefully and return null

     */
    public File createTempFile(final String prefix, final String suffix) {
        try {
            final File file = File.createTempFile(prefix, suffix);
            file.setReadable(false, false);
            file.setReadable(true, true);
            file.setWritable(false, false);
            file.setWritable(true, true);
            if (logger.isDebugEnabled()) {