Describe the bug

If you put sqlalchemy in a directory called "test", the test suite will fail. It doesn't have to be the direct parent, it can be an ancestor directory.

To Reproduce

cd /tmp
mkdir test
cd test
git clone https://github.com/sqlalchemy/sqlalchemy
cd sqlalchemy
tox -e py38-sqlite
# fails

### Error

Many errors, ending in:

[snip]
___________________________ ERROR at setup of DeclarativeTest_dynamic.test_alt_name_attr_subclass_relationship_attrset ___________________________
[gw1] linux -- Python 3.8.10 /tmp/test/sqlalchemy/.tox/py38-sqlite/bin/python
Traceback (most recent call last):
File "/tmp/test/sqlalchemy/test/orm/declarative/test_basic.py", line 70, in setup_test
Base = declarative_base(testing.db)
File "/tmp/test/sqlalchemy/.tox/py38-sqlite/lib/python3.8/site-packages/sqlalchemy/orm/decl_api.py", line 462, in declarative_base
util.warn_deprecated_20(
File "/tmp/test/sqlalchemy/.tox/py38-sqlite/lib/python3.8/site-packages/sqlalchemy/util/deprecations.py", line 59, in warn_deprecated_20
_warn_with_version(
File "/tmp/test/sqlalchemy/.tox/py38-sqlite/lib/python3.8/site-packages/sqlalchemy/util/deprecations.py", line 36, in _warn_with_version
_warnings_warn(warn, stacklevel=stacklevel + 1)
File "/tmp/test/sqlalchemy/.tox/py38-sqlite/lib/python3.8/site-packages/sqlalchemy/util/langhelpers.py", line 1675, in _warnings_warn
warnings.warn(message, stacklevel=stacklevel + 1)
sqlalchemy.exc.RemovedIn20Warning: The bind argument to declarative_base is deprecated and will be removed in SQLAlchemy 2.0. (Background on SQLAlchemy 2.0 at: https://sqlalche.me/e/b8d9)
============================================================ short test summary info =============================================================
SKIPPED [50] .tox/py38-sqlite/lib/python3.8/site-packages/sqlalchemy/testing/config.py:205: 'MypyPluginTest' unsupported on any DB implementation 'sqlite(3.31.1)+pysqlite', 'sqlite(3.31.1)+aiosqlite'custom function, custom function
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 25 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! xdist.dsession.Interrupted: stopping after 25 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
======================================================== 50 skipped, 25 errors in 19.65s =========================================================
ERROR: InvocationError for command /tmp/test/sqlalchemy/.tox/py38-sqlite/bin/python -m pytest --rootdir . --log-info=sqlalchemy.testing -n4 --max-worker-restart=5 --db sqlite --dbdriver sqlite --dbdriver aiosqlite --nomemory (exited with code 2)
____________________________________________________________________ summary _____________________________________________________________________
ERROR: py38-sqlite: commands failed

### Versions

- OS: Ubuntu
- Python: 3.8.10
- SQLAlchemy: rel_1_9_4
- Database: sqlite
- DBAPI: sqlite


### Additional context

_No response_