public long purge(long expiry) {
                baseDir = tempDir;
                // Count expired files
                int count = 0;
                File[] dirs = baseDir.listFiles();
                if (dirs != null) {
                    for (File dir : dirs) {
                        if (dir.isDirectory() && dir.getName().startsWith("_")) {
                            count++;
                        }
                    }

            Thread.sleep(20);
        } catch (InterruptedException e) {
            // ignore
        }

        File dir = new File(TEMP_DIR_PATH, baseFilename + System.currentTimeMillis());

        dir.mkdirs();
        markForDeletion(dir);

        return dir;
    }

    public synchronized File createTempFile() throws IOException {
        File tempFile = File.createTempFile(baseFilename, fileSuffix);

        try {
            final int maxCount = 50;
            final int numOfThread = 10;

            final File file = File.createTempFile("crawler-", "");
            file.delete();
            file.mkdirs();
            file.deleteOnExit();
            fileTransformer.setPath(file.getAbsolutePath());
            crawler.addUrl(url);
            crawler.crawlerContext.setMaxAccessCount(maxCount);

        try {
            final int maxCount = 50;
            final int numOfThread = 10;

            final File file = File.createTempFile("crawler-", "");
            file.delete();
            file.mkdirs();
            file.deleteOnExit();
            fileTransformer.setPath(file.getAbsolutePath());
            crawler.addUrl(url);
            crawler.getCrawlerContext().setMaxAccessCount(maxCount);

            assertNotNull(clazz.getMethod("createNewFile"), "Should have createNewFile method");
            assertNotNull(clazz.getMethod("mkdir"), "Should have mkdir method");
            assertNotNull(clazz.getMethod("mkdirs"), "Should have mkdirs method");
            assertNotNull(clazz.getMethod("delete"), "Should have delete method");
        }

        @Test

        try {
            final int maxCount = 50;
            final int numOfThread = 10;

            final File file = File.createTempFile("crawler-", "");
            file.delete();
            file.mkdirs();
            file.deleteOnExit();
            fileTransformer.setPath(file.getAbsolutePath());
            crawler.addUrl(url);
            crawler.crawlerContext.setMaxAccessCount(maxCount);

                    for (int j = 0; j < maxDuplicatedPath; j++) {
                        file = new File(targetFile, paths[i] + "_" + j);
                        if (!file.exists()) {
                            if (!file.mkdirs()) {
                                throw new CrawlerSystemException("Could not create " + file.getAbsolutePath());
                            }
                            break;
                        }

            // Arrange
            doReturn(false).when(smbFile).exists();
            doNothing().when(smbFile).mkdir();
            doNothing().when(smbFile).mkdirs();

            // Act
            smbFile.mkdirs();

            // Assert
            verify(smbFile).mkdirs();
        }

        @Test
        void testSetReadOnly() throws SmbException {
            // Arrange

        }
    }

    protected static File createDocRoot(final int count) {
        try {
            final File tempDir = File.createTempFile("crawlerDocRoot", "");
            tempDir.delete();
            tempDir.mkdirs();

            // robots.txt
            StringBuilder buf = new StringBuilder();
            buf.append("User-agent: *").append('\n');
            buf.append("Disallow: /admin/").append('\n');

    }

    protected void setBaseDir() throws IOException {
        fileTransformer.baseDir = File.createTempFile("crawler-", "");
        fileTransformer.baseDir.delete();
        fileTransformer.baseDir.mkdirs();
        fileTransformer.baseDir.deleteOnExit();
    }

    public void test_name() {
        assertEquals("fileTransformer", fileTransformer.getName());
    }

    public void test_getFilePath() {