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# Copyright DataStax, 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
# limitations under the License.
from cassandra.query import named_tuple_factory
import logging
import warnings
import sys
from unittest import TestCase
log = logging.getLogger(__name__)
NAMEDTUPLE_CREATION_BUG = sys.version_info >= (3,) and sys.version_info < (3, 7)
class TestNamedTupleFactory(TestCase):
long_colnames, long_rows = (
['col{}'.format(x) for x in range(300)],
[
['value{}'.format(x) for x in range(300)]
for _ in range(100)
]
)
short_colnames, short_rows = (
['col{}'.format(x) for x in range(200)],
[
['value{}'.format(x) for x in range(200)]
for _ in range(100)
]
)
def test_creation_warning_on_long_column_list(self):
"""
Reproduces the failure described in PYTHON-893
@since 3.15
@jira_ticket PYTHON-893
@expected_result creation fails on Python > 3 and < 3.7
@test_category row_factory
"""
if not NAMEDTUPLE_CREATION_BUG:
named_tuple_factory(self.long_colnames, self.long_rows)
return
with warnings.catch_warnings(record=True) as w:
rows = named_tuple_factory(self.long_colnames, self.long_rows)
self.assertEqual(len(w), 1)
warning = w[0]
self.assertIn('pseudo_namedtuple_factory', str(warning))
self.assertIn('3.7', str(warning))
for r in rows:
self.assertEqual(r.col0, self.long_rows[0][0])
def test_creation_no_warning_on_short_column_list(self):
"""
Tests that normal namedtuple row creation still works after PYTHON-893 fix
@since 3.15
@jira_ticket PYTHON-893
@expected_result creates namedtuple-based Rows
@test_category row_factory
"""
with warnings.catch_warnings(record=True) as w:
rows = named_tuple_factory(self.short_colnames, self.short_rows)
self.assertEqual(len(w), 0)
# check that this is a real namedtuple
self.assertTrue(hasattr(rows[0], '_fields'))
self.assertIsInstance(rows[0], tuple)
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