readOnlyDir.setWritable(false);
        File invalidOutputFile = new File(readOnlyDir, "thumbnail.png");

        String thumbnailId = "test-thumbnail-003";
        assertFalse(thumbnailGenerator.generate(thumbnailId, invalidOutputFile));

        // Cleanup
        readOnlyDir.setWritable(true);
    }

    public void test_isTarget_withSupportedMimeType() {

        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()) {
                logger.debug("Create {} as a temp file.", file.getAbsolutePath());
            }
            return file;

    }

    public void test_isEditable() {
        // Test with non-editable user (default)
        testUser.setEditable(false);
        assertFalse(fessUserBean.isEditable());

        // Test with editable user
        testUser.setEditable(true);
        assertTrue(fessUserBean.isEditable());
    }

    public void test_hasRole() {
        // Test with no roles