assertNull(permissionHelper.encode("(deny)"));
        assertNull(permissionHelper.encode("(allow){user}"));
        assertNull(permissionHelper.encode("(deny){group}"));
    }

    public void test_passthroughValues() {
        assertEquals("plaintext", permissionHelper.encode("plaintext"));
        assertEquals("plaintext", permissionHelper.decode("plaintext"));

        assertEquals("abc", permissionHelper.encode("abc"));