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try:
    # installed by bootstrap.py
    import sqla_plugin_base as plugin_base
except ImportError:
    # assume we're a package, use traditional import
    from . import plugin_base

import argparse
import collections
from functools import update_wrapper
import inspect
import itertools
import operator
import os
import re
import sys

import pytest

try:
    import typing
except ImportError:
    pass
else:
    if typing.TYPE_CHECKING:
        from typing import Sequence

try:
    import xdist  # noqa

has_xdist = True
except ImportError:
    has_xdist = False

def pytest_addoption(parser):
    group = parser.getgroup("sqlalchemy")

def make_option(name, **kw):
        callback_ = kw.pop("callback", None)
        if callback_:

class CallableAction(argparse.Action):
                def __call__(
                    self, parser, namespace, values, option_string=None
                ):
                    callback_(option_string, values, parser)

kw["action"] = CallableAction

zeroarg_callback = kw.pop("zeroarg_callback", None)
        if zeroarg_callback:

class CallableAction(argparse.Action):
                def __init__(
                    self,
                    option_strings,
                    dest,
                    default=False,
                    required=False,
                    help=None,  # noqa
                ):
                    super(CallableAction, self).__init__(
                        option_strings=option_strings,
                        dest=dest,
                        nargs=0,
                        const=True,
                        default=default,
                        required=required,
                        help=help,
                    )

def __call__(
                    self, parser, namespace, values, option_string=None
                ):
                    zeroarg_callback(option_string, values, parser)

kw["action"] = CallableAction

group.addoption(name, **kw)

plugin_base.setup_options(make_option)
    plugin_base.read_config()

def pytest_configure(config):
    pytest.register_assert_rewrite("sqlalchemy.testing.assertions")

if hasattr(config, "workerinput"):
        plugin_base.restore_important_follower_config(config.workerinput)
        plugin_base.configure_follower(config.workerinput["follower_ident"])
    else:
        if config.option.write_idents and os.path.exists(
            config.option.write_idents
        ):
            os.remove(config.option.write_idents)

plugin_base.pre_begin(config.option)

plugin_base.set_coverage_flag(
        bool(getattr(config.option, "cov_source", False))
    )

plugin_base.set_fixture_functions(PytestFixtureFunctions)

def pytest_sessionstart(session):
    plugin_base.post_begin()

def pytest_sessionfinish(session):
    plugin_base.final_process_cleanup()

if has_xdist:
    import uuid

def pytest_configure_node(node):
        # the master for each node fills workerinput dictionary
        # which pytest-xdist will transfer to the subprocess

plugin_base.memoize_important_follower_config(node.workerinput)

node.workerinput["follower_ident"] = "test_%s" % uuid.uuid4().hex[0:12]
        from sqlalchemy.testing import provision

provision.create_follower_db(node.workerinput["follower_ident"])

def pytest_testnodedown(node, error):
        from sqlalchemy.testing import provision

provision.drop_follower_db(node.workerinput["follower_ident"])

def pytest_collection_modifyitems(session, config, items):
    # look for all those classes that specify __backend__ and
    # expand them out into per-database test cases.

# this is much easier to do within pytest_pycollect_makeitem, however
    # pytest is iterating through cls.__dict__ as makeitem is
    # called which causes a "dictionary changed size" error on py3k.
    # I'd submit a pullreq for them to turn it into a list first, but
    # it's to suit the rather odd use case here which is that we are adding
    # new classes to a module on the fly.

rebuilt_items = collections.defaultdict(
        lambda: collections.defaultdict(list)
    )

items[:] = [
        item
        for item in items
        if isinstance(item.parent, pytest.Instance)
        and not item.parent.parent.name.startswith("_")
    ]

test_classes = set(item.parent for item in items)
    for test_class in test_classes:
        for sub_cls in plugin_base.generate_sub_tests(
            test_class.cls, test_class.parent.module
        ):
            if sub_cls is not test_class.cls:
                per_cls_dict = rebuilt_items[test_class.cls]

# support pytest 5.4.0 and above pytest.Class.from_parent
                ctor = getattr(pytest.Class, "from_parent", pytest.Class)
                for inst in ctor(
                    name=sub_cls.__name__, parent=test_class.parent.parent
                ).collect():
                    for t in inst.collect():
                        per_cls_dict[t.name].append(t)

newitems = []
    for item in items:
        if item.parent.cls in rebuilt_items:
            newitems.extend(rebuilt_items[item.parent.cls][item.name])
        else:
            newitems.append(item)

# seems like the functions attached to a test class aren't sorted already?
    # is that true and why's that? (when using unittest, they're sorted)
    items[:] = sorted(
        newitems,
        key=lambda item: (
            item.parent.parent.parent.name,
            item.parent.parent.name,
            item.name,
        ),
    )

def pytest_pycollect_makeitem(collector, name, obj):

if inspect.isclass(obj) and plugin_base.want_class(name, obj):

# support pytest 5.4.0 and above pytest.Class.from_parent
        ctor = getattr(pytest.Class, "from_parent", pytest.Class)

return [
            ctor(name=parametrize_cls.__name__, parent=collector)
            for parametrize_cls in _parametrize_cls(collector.module, obj)
        ]
    elif (
        inspect.isfunction(obj)
        and isinstance(collector, pytest.Instance)
        and plugin_base.want_method(collector.cls, obj)
    ):
        # None means, fall back to default logic, which includes
        # method-level parametrize
        return None
    else:
        # empty list means skip this item
        return []

_current_class = None

def _parametrize_cls(module, cls):
    """implement a class-based version of pytest parametrize."""

if "_sa_parametrize" not in cls.__dict__:
        return [cls]

_sa_parametrize = cls._sa_parametrize
    classes = []
    for full_param_set in itertools.product(
        *[params for argname, params in _sa_parametrize]
    ):
        cls_variables = {}

for argname, param in zip(
            [_sa_param[0] for _sa_param in _sa_parametrize], full_param_set
        ):
            if not argname:
                raise TypeError("need argnames for class-based combinations")
            argname_split = re.split(r",\s*", argname)
            for arg, val in zip(argname_split, param.values):
                cls_variables[arg] = val
        parametrized_name = "_".join(
            # token is a string, but in py2k pytest is giving us a unicode,
            # so call str() on it.
            str(re.sub(r"\W", "", token))
            for param in full_param_set
            for token in param.id.split("-")
        )
        name = "%s_%s" % (cls.__name__, parametrized_name)
        newcls = type.__new__(type, name, (cls,), cls_variables)
        setattr(module, name, newcls)
        classes.append(newcls)
    return classes

def pytest_runtest_setup(item):
    # here we seem to get called only based on what we collected
    # in pytest_collection_modifyitems.   So to do class-based stuff
    # we have to tear that out.
    global _current_class

if not isinstance(item, pytest.Function):
        return

# ... so we're doing a little dance here to figure it out...
    if _current_class is None:
        class_setup(item.parent.parent)
        _current_class = item.parent.parent

# this is needed for the class-level, to ensure that the
        # teardown runs after the class is completed with its own
        # class-level teardown...
        def finalize():
            global _current_class
            class_teardown(item.parent.parent)
            _current_class = None

item.parent.parent.addfinalizer(finalize)

test_setup(item)

def pytest_runtest_teardown(item):
    # ...but this works better as the hook here rather than
    # using a finalizer, as the finalizer seems to get in the way
    # of the test reporting failures correctly (you get a bunch of
    # pytest assertion stuff instead)
    test_teardown(item)

def test_setup(item):
    plugin_base.before_test(
        item, item.parent.module.__name__, item.parent.cls, item.name
    )

def test_teardown(item):
    plugin_base.after_test(item)

def class_setup(item):
    plugin_base.start_test_class(item.cls)

def class_teardown(item):
    plugin_base.stop_test_class(item.cls)

def getargspec(fn):
    if sys.version_info.major == 3:
        return inspect.getfullargspec(fn)
    else:
        return inspect.getargspec(fn)

def _pytest_fn_decorator(target):
    """Port of langhelpers.decorator with pytest-specific tricks."""

from sqlalchemy.util.langhelpers import format_argspec_plus
    from sqlalchemy.util.compat import inspect_getfullargspec

def _exec_code_in_env(code, env, fn_name):
        exec(code, env)
        return env[fn_name]

def decorate(fn, add_positional_parameters=()):

spec = inspect_getfullargspec(fn)
        if add_positional_parameters:
            spec.args.extend(add_positional_parameters)

metadata = dict(target="target", fn="fn", name=fn.__name__)
        metadata.update(format_argspec_plus(spec, grouped=False))
        code = (
            """\
def %(name)s(%(args)s):
    return %(target)s(%(fn)s, %(apply_kw)s)
"""
            % metadata
        )
        decorated = _exec_code_in_env(
            code, {"target": target, "fn": fn}, fn.__name__
        )
        if not add_positional_parameters:
            decorated.__defaults__ = getattr(fn, "im_func", fn).__defaults__
            decorated.__wrapped__ = fn
            return update_wrapper(decorated, fn)
        else:
            # this is the pytest hacky part.  don't do a full update wrapper
            # because pytest is really being sneaky about finding the args
            # for the wrapped function
            decorated.__module__ = fn.__module__
            decorated.__name__ = fn.__name__
            return decorated

return decorate

class PytestFixtureFunctions(plugin_base.FixtureFunctions):
    def skip_test_exception(self, *arg, **kw):
        return pytest.skip.Exception(*arg, **kw)

_combination_id_fns = {
        "i": lambda obj: obj,
        "r": repr,
        "s": str,
        "n": lambda obj: obj.__name__
        if hasattr(obj, "__name__")
        else type(obj).__name__,
    }

def combinations(self, *arg_sets, **kw):
        """Facade for pytest.mark.parametrize.

Automatically derives argument names from the callable which in our
        case is always a method on a class with positional arguments.

ids for parameter sets are derived using an optional template.

"""
        from sqlalchemy.testing import exclusions

if sys.version_info.major == 3:
            if len(arg_sets) == 1 and hasattr(arg_sets[0], "__next__"):
                arg_sets = list(arg_sets[0])
        else:
            if len(arg_sets) == 1 and hasattr(arg_sets[0], "next"):
                arg_sets = list(arg_sets[0])

argnames = kw.pop("argnames", None)

def _filter_exclusions(args):
            result = []
            gathered_exclusions = []
            for a in args:
                if isinstance(a, exclusions.compound):
                    gathered_exclusions.append(a)
                else:
                    result.append(a)

return result, gathered_exclusions

id_ = kw.pop("id_", None)

tobuild_pytest_params = []
        has_exclusions = False
        if id_:
            _combination_id_fns = self._combination_id_fns

# because itemgetter is not consistent for one argument vs.
            # multiple, make it multiple in all cases and use a slice
            # to omit the first argument
            _arg_getter = operator.itemgetter(
                0,
                *[
                    idx
                    for idx, char in enumerate(id_)
                    if char in ("n", "r", "s", "a")
                ]
            )
            fns = [
                (operator.itemgetter(idx), _combination_id_fns[char])
                for idx, char in enumerate(id_)
                if char in _combination_id_fns
            ]

for arg in arg_sets:
                if not isinstance(arg, tuple):
                    arg = (arg,)

fn_params, param_exclusions = _filter_exclusions(arg)

parameters = _arg_getter(fn_params)[1:]

if param_exclusions:
                    has_exclusions = True

tobuild_pytest_params.append(
                    (
                        parameters,
                        param_exclusions,
                        "-".join(
                            comb_fn(getter(arg)) for getter, comb_fn in fns
                        ),
                    )
                )

else:

for arg in arg_sets:
                if not isinstance(arg, tuple):
                    arg = (arg,)

fn_params, param_exclusions = _filter_exclusions(arg)

if param_exclusions:
                    has_exclusions = True

tobuild_pytest_params.append(
                    (fn_params, param_exclusions, None)
                )

pytest_params = []
        for parameters, param_exclusions, id_ in tobuild_pytest_params:
            if has_exclusions:
                parameters += (param_exclusions,)

param = pytest.param(*parameters, id=id_)
            pytest_params.append(param)

def decorate(fn):
            if inspect.isclass(fn):
                if has_exclusions:
                    raise NotImplementedError(
                        "exclusions not supported for class level combinations"
                    )
                if "_sa_parametrize" not in fn.__dict__:
                    fn._sa_parametrize = []
                fn._sa_parametrize.append((argnames, pytest_params))
                return fn
            else:
                if argnames is None:
                    _argnames = getargspec(fn).args[1:]  # type: Sequence(str)
                else:
                    _argnames = re.split(
                        r", *", argnames
                    )  # type: Sequence(str)

if has_exclusions:
                    _argnames += ["_exclusions"]

@_pytest_fn_decorator
                    def check_exclusions(fn, *args, **kw):
                        _exclusions = args[-1]
                        if _exclusions:
                            exlu = exclusions.compound().add(*_exclusions)
                            fn = exlu(fn)
                        return fn(*args[0:-1], **kw)

def process_metadata(spec):
                        spec.args.append("_exclusions")

fn = check_exclusions(
                        fn, add_positional_parameters=("_exclusions",)
                    )

return pytest.mark.parametrize(_argnames, pytest_params)(fn)

return decorate

def param_ident(self, *parameters):
        ident = parameters[0]
        return pytest.param(*parameters[1:], id=ident)

def fixture(self, *arg, **kw):
        return pytest.fixture(*arg, **kw)

def get_current_test_name(self):
        return os.environ.get("PYTEST_CURRENT_TEST")

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