# coding: utf-8
from __future__ import unicode_literals

import pytest
from spacy.tokens import Doc
from spacy.vocab import Vocab


@pytest.fixture
def doc_w_attrs(en_tokenizer):
    Doc.set_extension('_test_attr', default=False)
    Doc.set_extension('_test_prop', getter=lambda doc: len(doc.text))
    Doc.set_extension('_test_method', method=lambda doc, arg: "{}{}".format(len(doc.text), arg))
    doc = en_tokenizer("This is a test.")
    doc._._test_attr = 'test'
    return doc



def test_serialize_ext_attrs_from_bytes(doc_w_attrs):
    doc_b = doc_w_attrs.to_bytes()
    doc = Doc(Vocab()).from_bytes(doc_b)
    assert doc._.has('_test_attr')
    assert doc._._test_attr == 'test'
    assert doc._._test_prop == len(doc.text)
    assert doc._._test_method('test') == '{}{}'.format(len(doc.text), 'test')