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+# testing/util.py
+# Copyright (C) 2005-2019 the SQLAlchemy authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: http://www.opensource.org/licenses/mit-license.php
+from __future__ import annotations
+
+import types
+from typing import Union
+
+from sqlalchemy.util import inspect_getfullargspec
+
+from ..util import sqla_2
+
+
+def flag_combinations(*combinations):
+ """A facade around @testing.combinations() oriented towards boolean
+ keyword-based arguments.
+
+ Basically generates a nice looking identifier based on the keywords
+ and also sets up the argument names.
+
+ E.g.::
+
+ @testing.flag_combinations(
+ dict(lazy=False, passive=False),
+ dict(lazy=True, passive=False),
+ dict(lazy=False, passive=True),
+ dict(lazy=False, passive=True, raiseload=True),
+ )
+
+
+ would result in::
+
+ @testing.combinations(
+ ('', False, False, False),
+ ('lazy', True, False, False),
+ ('lazy_passive', True, True, False),
+ ('lazy_passive', True, True, True),
+ id_='iaaa',
+ argnames='lazy,passive,raiseload'
+ )
+
+ """
+ from sqlalchemy.testing import config
+
+ keys = set()
+
+ for d in combinations:
+ keys.update(d)
+
+ keys = sorted(keys)
+
+ return config.combinations(
+ *[
+ ("_".join(k for k in keys if d.get(k, False)),)
+ + tuple(d.get(k, False) for k in keys)
+ for d in combinations
+ ],
+ id_="i" + ("a" * len(keys)),
+ argnames=",".join(keys),
+ )
+
+
+def resolve_lambda(__fn, **kw):
+ """Given a no-arg lambda and a namespace, return a new lambda that
+ has all the values filled in.
+
+ This is used so that we can have module-level fixtures that
+ refer to instance-level variables using lambdas.
+
+ """
+
+ pos_args = inspect_getfullargspec(__fn)[0]
+ pass_pos_args = {arg: kw.pop(arg) for arg in pos_args}
+ glb = dict(__fn.__globals__)
+ glb.update(kw)
+ new_fn = types.FunctionType(__fn.__code__, glb)
+ return new_fn(**pass_pos_args)
+
+
+def metadata_fixture(ddl="function"):
+ """Provide MetaData for a pytest fixture."""
+
+ from sqlalchemy.testing import config
+ from . import fixture_functions
+
+ def decorate(fn):
+ def run_ddl(self):
+ from sqlalchemy import schema
+
+ metadata = self.metadata = schema.MetaData()
+ try:
+ result = fn(self, metadata)
+ metadata.create_all(config.db)
+ # TODO:
+ # somehow get a per-function dml erase fixture here
+ yield result
+ finally:
+ metadata.drop_all(config.db)
+
+ return fixture_functions.fixture(scope=ddl)(run_ddl)
+
+ return decorate
+
+
+def _safe_int(value: str) -> Union[int, str]:
+ try:
+ return int(value)
+ except:
+ return value
+
+
+def testing_engine(url=None, options=None, future=False):
+ from sqlalchemy.testing import config
+ from sqlalchemy.testing.engines import testing_engine
+
+ if not future:
+ future = getattr(config._current.options, "future_engine", False)
+
+ if not sqla_2:
+ kw = {"future": future} if future else {}
+ else:
+ kw = {}
+ return testing_engine(url, options, **kw)