# Copyright 2020-present MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
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"""Test type checking of bson."""

import unittest

import bson
from bson.objectid import ObjectId


class TestBSON(unittest.TestCase):
    def test_bson_encode_decode(self) -> None:
        doc = {"_id": ObjectId()}
        encoded = bson.encode(doc)
        decoded = bson.decode(encoded)
        encoded = bson.encode(decoded)
        decoded = bson.decode(encoded)
        # Documents returned from decode are mutable.
        decoded["new_field"] = 1
        self.assertTrue(decoded["_id"].generation_time)


if __name__ == "__main__":
    unittest.main()
