#29813: backends.base.test_operations.DatabaseOperationTests fails on MySQL in
isolation
-------------------------------------+-------------------------------------
Reporter: Jon | Owner: nobody
Dufresne |
Type: Bug | Status: new
Component: Database | Version: master
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
When running the Django test
`backends.base.test_operations.DatabaseOperationTests` in isolation with a
MySQL configuration, it fails with the following error:
{{{
======================================================================
FAIL: test_window_frame_raise_not_supported_error
(backends.base.test_operations.DatabaseOperationTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File ".../django/django/test/testcases.py", line 1114, in skip_wrapper
if condition():
File ".../django/django/test/testcases.py", line 1135, in <lambda>
lambda: any(getattr(connection.features, feature, False) for feature
in features),
File ".../django/django/test/testcases.py", line 1135, in <genexpr>
lambda: any(getattr(connection.features, feature, False) for feature
in features),
File ".../django/django/utils/functional.py", line 37, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File ".../django/django/db/backends/mysql/features.py", line 84, in
supports_over_clause
if self.connection.mysql_is_mariadb:
File ".../django/django/utils/functional.py", line 37, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File ".../django/django/db/backends/mysql/base.py", line 344, in
mysql_is_mariadb
return 'mariadb' in self.mysql_server_info.lower()
File ".../django/django/utils/functional.py", line 37, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File ".../django/django/db/backends/mysql/base.py", line 330, in
mysql_server_info
with self.temporary_connection() as cursor:
File "/usr/lib64/python3.7/contextlib.py", line 112, in __enter__
return next(self.gen)
File ".../django/django/db/backends/base/base.py", line 577, in
temporary_connection
with self.cursor() as cursor:
File ".../django/django/test/testcases.py", line 144, in __call__
"set %s.allow_database_queries to True to silence this failure." %
self.cls_name
AssertionError: Database queries aren't allowed in SimpleTestCase. Either
use TestCase or TransactionTestCase to ensure proper test isolation or set
DatabaseOperationTests.allow_database_queries to True to silence this
failure.
}}}
The test is using `SimpleTestCase`, but this test executes a query on
MySQL for feature detection.
--
Ticket URL: <https://code.djangoproject.com/ticket/29813>
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