def iter_postings(txn: Transaction) -> Iterator[Posting]:

    for index, source in enumerate(txn.postings):

        yield source._replace(

            meta=PostingMeta(txn, index, source),

        )

"""Test data.iter_postings function"""

# Copyright © 2020  Brett Smith

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU Affero General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU Affero General Public License for more details.

#

# You should have received a copy of the GNU Affero General Public License

# along with this program.  If not, see <https://www.gnu.org/licenses/>.

import pytest

from . import testutil

from beancount.core import data as bc_data

from conservancy_beancount import data

@pytest.fixture

def simple_txn(index=None, key=None):

    return testutil.Transaction(note='txn note', postings=[

        ('Assets:Cash', 5),

        ('Income:Donations', -5, {'note': 'donation love', 'extra': 'Extra'}),

    ])

def test_iter_postings(simple_txn):

    for source, post in zip(simple_txn.postings, data.iter_postings(simple_txn)):

        assert all(source[x] == post[x] for x in range(len(source) - 1))

        assert post.meta['note']  # Only works with PostingMeta

def test_editing_metadata_edits_source(simple_txn):

    for index, post in enumerate(data.iter_postings(simple_txn)):

        post.meta['edited'] = str(index)

    for index, post in enumerate(simple_txn.postings):

        assert post.meta['edited'] == str(index)

        assert not isinstance(post.meta, data.PostingMeta)