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import copy
import sqlite3
from unittest import mock, skipUnless
from django.db import OperationalError, connection
from django.test import TestCase
@skipUnless(connection.vendor == "sqlite", "SQLite tests.")
class FeaturesTests(TestCase):
def test_supports_json_field_operational_error(self):
if hasattr(connection.features, "supports_json_field"):
del connection.features.supports_json_field
msg = "unable to open database file"
with mock.patch.object(
connection,
"cursor",
side_effect=OperationalError(msg),
):
with self.assertRaisesMessage(OperationalError, msg):
connection.features.supports_json_field
def test_max_query_params_respects_variable_limit(self):
limit_name = sqlite3.SQLITE_LIMIT_VARIABLE_NUMBER
current_limit = connection.features.max_query_params
new_limit = min(42, current_limit)
try:
connection.connection.setlimit(limit_name, new_limit)
self.assertEqual(connection.features.max_query_params, new_limit)
finally:
connection.connection.setlimit(limit_name, current_limit)
self.assertEqual(connection.features.max_query_params, current_limit)
def test_max_query_params_without_established_connection(self):
new_connection = connection.copy()
new_connection.settings_dict = copy.deepcopy(connection.settings_dict)
self.assertIsNone(new_connection.connection)
try:
result = new_connection.features.max_query_params
self.assertIsInstance(result, int)
finally:
new_connection._close()
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