How to use the pycdlib.udf.UDFFileIdentifierDescriptor function in pycdlib

def test_file_ident_equals():
    fi = pycdlib.udf.UDFFileIdentifierDescriptor()
    fi.new(False, False, b'foo', None)

    fi2 = pycdlib.udf.UDFFileIdentifierDescriptor()
    fi2.new(False, False, b'foo', None)

    assert(fi == fi2)

def test_file_ident_lt_one_parent():
    fi = pycdlib.udf.UDFFileIdentifierDescriptor()
    fi.new(False, True, b'foo', None)

    fi2 = pycdlib.udf.UDFFileIdentifierDescriptor()
    fi2.new(False, False, b'hoo', None)

    assert(fi < fi2)

def test_file_ident_new_initialized_twice():
    fi = pycdlib.udf.UDFFileIdentifierDescriptor()
    fi.new(False, False, b'foo', None)
    with pytest.raises(pycdlib.pycdlibexception.PyCdlibInternalError) as excinfo:
        fi.new(False, False, b'foo', None)
    assert(str(excinfo.value) == 'UDF File Identifier already initialized')

def test_file_ident_is_parent_not_initialized():
    fi = pycdlib.udf.UDFFileIdentifierDescriptor()
    with pytest.raises(pycdlib.pycdlibexception.PyCdlibInternalError) as excinfo:
        fi.is_parent()
    assert(str(excinfo.value) == 'UDF File Identifier Descriptor not initialized')

def test_file_ident_parse_initialized_twice():
    tag = pycdlib.udf.UDFTag()
    tag.new(0, 0)

    entry = pycdlib.udf.UDFFileEntry()
    entry.new(0, 'dir', None, 2048)

    fi = pycdlib.udf.UDFFileIdentifierDescriptor()
    fi.parse(b'\x00'*16 + b'\x01\x00\x08\x00' + b'\x00'*16 + b'\x00\x00', 0, tag, entry)
    with pytest.raises(pycdlib.pycdlibexception.PyCdlibInternalError) as excinfo:
        fi.parse(b'\x00'*16 + b'\x01\x00\x08\x00' + b'\x00'*16 + b'\x00\x00', 0, tag, entry)
    assert(str(excinfo.value) == 'UDF File Identifier Descriptor already initialized')

def test_file_ident_parse_bad_encoding():
    tag = pycdlib.udf.UDFTag()
    tag.new(0, 0)

    entry = pycdlib.udf.UDFFileEntry()
    entry.new(0, 'dir', None, 2048)

    fi = pycdlib.udf.UDFFileIdentifierDescriptor()
    with pytest.raises(pycdlib.pycdlibexception.PyCdlibInvalidISO) as excinfo:
        fi.parse(b'\x00'*16 + b'\x01\x00\x00\x01' + b'\x00'*16 + b'\x00\x00\x00', 0, tag, entry)
    assert(str(excinfo.value) == 'Only UDF File Identifier Descriptor Encodings 8 or 16 are supported')

def test_file_ident_is_dir_not_initialized():
    fi = pycdlib.udf.UDFFileIdentifierDescriptor()
    with pytest.raises(pycdlib.pycdlibexception.PyCdlibInternalError) as excinfo:
        fi.is_dir()
    assert(str(excinfo.value) == 'UDF File Identifier Descriptor not initialized')

def test_file_entry_add_file_ident_desc_bad_file_type():
    entry = pycdlib.udf.UDFFileEntry()
    entry.new(0, 'file', None, 2048)
    desc = pycdlib.udf.UDFFileIdentifierDescriptor()
    desc.new(False, False, b'foo', None)
    with pytest.raises(pycdlib.pycdlibexception.PyCdlibInvalidInput) as excinfo:
        entry.add_file_ident_desc(desc, 2048)
    assert(str(excinfo.value) == 'Can only add a UDF File Identifier to a directory')

def test_file_ident_record_not_initialized():
    fi = pycdlib.udf.UDFFileIdentifierDescriptor()
    with pytest.raises(pycdlib.pycdlibexception.PyCdlibInternalError) as excinfo:
        fi.record()
    assert(str(excinfo.value) == 'UDF File Identifier Descriptor not initialized')

Parameters:
         new_fi_desc - The new UDF File Identifier Descriptor to add.
         logical_block_size - The logical block size to use.
        Returns:
         The number of extents added due to adding this File Identifier Descriptor.
        '''
        if not self._initialized:
            raise pycdlibexception.PyCdlibInternalError('UDF File Entry not initialized')

        if self.icb_tag.file_type != 4:
            raise pycdlibexception.PyCdlibInvalidInput('Can only add a UDF File Identifier to a directory')

        self.fi_descs.append(new_fi_desc)

        num_bytes_to_add = UDFFileIdentifierDescriptor.length(len(new_fi_desc.fi))

        old_num_extents = 0
        # If info_len is 0, then this is a brand-new File Entry, and thus the
        # number of extents it is using is 0.
        if self.info_len > 0:
            old_num_extents = utils.ceiling_div(self.info_len, logical_block_size)

        self.info_len += num_bytes_to_add
        new_num_extents = utils.ceiling_div(self.info_len, logical_block_size)

        self.log_block_recorded = new_num_extents

        self.alloc_descs[0][0] = self.info_len
        if new_fi_desc.is_dir():
            self.file_link_count += 1