#! coding: utf-8

import copy
import datetime
import inspect

from sqlalchemy import exc
from sqlalchemy import sql
from sqlalchemy import testing
from sqlalchemy import util
from sqlalchemy.sql import column
from sqlalchemy.testing import assert_raises
from sqlalchemy.testing import assert_raises_message
from sqlalchemy.testing import eq_
from sqlalchemy.testing import expect_warnings
from sqlalchemy.testing import fails_if
from sqlalchemy.testing import fixtures
from sqlalchemy.testing import in_
from sqlalchemy.testing import is_
from sqlalchemy.testing import mock
from sqlalchemy.testing import ne_
from sqlalchemy.testing.util import gc_collect
from sqlalchemy.testing.util import picklers
from sqlalchemy.util import classproperty
from sqlalchemy.util import compat
from sqlalchemy.util import get_callable_argspec
from sqlalchemy.util import langhelpers
from sqlalchemy.util import timezone
from sqlalchemy.util import WeakSequence


class _KeyedTupleTest(object):
    def _fixture(self, values, labels):
        raise NotImplementedError()

    def test_empty(self):
        keyed_tuple = self._fixture([], [])
        eq_(str(keyed_tuple), "()")
        eq_(len(keyed_tuple), 0)

        eq_(list(keyed_tuple.keys()), [])
        eq_(keyed_tuple._fields, ())
        eq_(keyed_tuple._asdict(), {})

    def test_values_but_no_labels(self):
        keyed_tuple = self._fixture([1, 2], [])
        eq_(str(keyed_tuple), "(1, 2)")
        eq_(len(keyed_tuple), 2)

        eq_(list(keyed_tuple.keys()), [])
        eq_(keyed_tuple._fields, ())
        eq_(keyed_tuple._asdict(), {})

        eq_(keyed_tuple[0], 1)
        eq_(keyed_tuple[1], 2)

    def test_basic_creation(self):
        keyed_tuple = self._fixture([1, 2], ["a", "b"])
        eq_(str(keyed_tuple), "(1, 2)")
        eq_(list(keyed_tuple.keys()), ["a", "b"])
        eq_(keyed_tuple._fields, ("a", "b"))
        eq_(keyed_tuple._asdict(), {"a": 1, "b": 2})

    def test_basic_index_access(self):
        keyed_tuple = self._fixture([1, 2], ["a", "b"])
        eq_(keyed_tuple[0], 1)
        eq_(keyed_tuple[1], 2)

        def should_raise():
            keyed_tuple[2]

        assert_raises(IndexError, should_raise)

    def test_basic_attribute_access(self):
        keyed_tuple = self._fixture([1, 2], ["a", "b"])
        eq_(keyed_tuple.a, 1)
        eq_(keyed_tuple.b, 2)

        def should_raise():
            keyed_tuple.c

        assert_raises(AttributeError, should_raise)

    def test_none_label(self):
        keyed_tuple = self._fixture([1, 2, 3], ["a", None, "b"])
        eq_(str(keyed_tuple), "(1, 2, 3)")

        eq_(list(keyed_tuple.keys()), ["a", "b"])
        eq_(keyed_tuple._fields, ("a", "b"))
        eq_(keyed_tuple._asdict(), {"a": 1, "b": 3})

        # attribute access: can't get at value 2
        eq_(keyed_tuple.a, 1)
        eq_(keyed_tuple.b, 3)

        # index access: can get at value 2
        eq_(keyed_tuple[0], 1)
        eq_(keyed_tuple[1], 2)
        eq_(keyed_tuple[2], 3)

    def test_duplicate_labels(self):
        keyed_tuple = self._fixture([1, 2, 3], ["a", "b", "b"])
        eq_(str(keyed_tuple), "(1, 2, 3)")

        eq_(list(keyed_tuple.keys()), ["a", "b", "b"])
        eq_(keyed_tuple._fields, ("a", "b", "b"))
        eq_(keyed_tuple._asdict(), {"a": 1, "b": 3})

        # attribute access: can't get at value 2
        eq_(keyed_tuple.a, 1)
        eq_(keyed_tuple.b, 3)

        # index access: can get at value 2
        eq_(keyed_tuple[0], 1)
        eq_(keyed_tuple[1], 2)
        eq_(keyed_tuple[2], 3)

    def test_immutable(self):
        keyed_tuple = self._fixture([1, 2], ["a", "b"])
        eq_(str(keyed_tuple), "(1, 2)")

        eq_(keyed_tuple.a, 1)

        assert_raises(AttributeError, setattr, keyed_tuple, "a", 5)

        def should_raise():
            keyed_tuple[0] = 100

        assert_raises(TypeError, should_raise)

    def test_serialize(self):

        keyed_tuple = self._fixture([1, 2, 3], ["a", None, "b"])

        for loads, dumps in picklers():
            kt = loads(dumps(keyed_tuple))

            eq_(str(kt), "(1, 2, 3)")

            eq_(list(kt.keys()), ["a", "b"])
            eq_(kt._fields, ("a", "b"))
            eq_(kt._asdict(), {"a": 1, "b": 3})


class KeyedTupleTest(_KeyedTupleTest, fixtures.TestBase):
    def _fixture(self, values, labels):
        return util.KeyedTuple(values, labels)


class LWKeyedTupleTest(_KeyedTupleTest, fixtures.TestBase):
    def _fixture(self, values, labels):
        return util.lightweight_named_tuple("n", labels)(values)


class WeakSequenceTest(fixtures.TestBase):
    @testing.requires.predictable_gc
    def test_cleanout_elements(self):
        class Foo(object):
            pass

        f1, f2, f3 = Foo(), Foo(), Foo()
        w = WeakSequence([f1, f2, f3])
        eq_(len(w), 3)
        eq_(len(w._storage), 3)
        del f2
        gc_collect()
        eq_(len(w), 2)
        eq_(len(w._storage), 2)

    @testing.requires.predictable_gc
    def test_cleanout_appended(self):
        class Foo(object):
            pass

        f1, f2, f3 = Foo(), Foo(), Foo()
        w = WeakSequence()
        w.append(f1)
        w.append(f2)
        w.append(f3)
        eq_(len(w), 3)
        eq_(len(w._storage), 3)
        del f2
        gc_collect()
        eq_(len(w), 2)
        eq_(len(w._storage), 2)


class OrderedDictTest(fixtures.TestBase):
    def test_odict(self):
        o = util.OrderedDict()
        o["a"] = 1
        o["b"] = 2
        o["snack"] = "attack"
        o["c"] = 3

        eq_(list(o.keys()), ["a", "b", "snack", "c"])
        eq_(list(o.values()), [1, 2, "attack", 3])

        o.pop("snack")
        eq_(list(o.keys()), ["a", "b", "c"])
        eq_(list(o.values()), [1, 2, 3])

        try:
            o.pop("eep")
            assert False
        except KeyError:
            pass

        eq_(o.pop("eep", "woot"), "woot")

        try:
            o.pop("whiff", "bang", "pow")
            assert False
        except TypeError:
            pass

        eq_(list(o.keys()), ["a", "b", "c"])
        eq_(list(o.values()), [1, 2, 3])

        o2 = util.OrderedDict(d=4)
        o2["e"] = 5

        eq_(list(o2.keys()), ["d", "e"])
        eq_(list(o2.values()), [4, 5])

        o.update(o2)
        eq_(list(o.keys()), ["a", "b", "c", "d", "e"])
        eq_(list(o.values()), [1, 2, 3, 4, 5])

        o.setdefault("c", "zzz")
        o.setdefault("f", 6)
        eq_(list(o.keys()), ["a", "b", "c", "d", "e", "f"])
        eq_(list(o.values()), [1, 2, 3, 4, 5, 6])

    def test_odict_constructor(self):
        o = util.OrderedDict(
            [("name", "jbe"), ("fullname", "jonathan"), ("password", "")]
        )
        eq_(list(o.keys()), ["name", "fullname", "password"])

    def test_odict_copy(self):
        o = util.OrderedDict()
        o["zzz"] = 1
        o["aaa"] = 2
        eq_(list(o.keys()), ["zzz", "aaa"])

        o2 = o.copy()
        eq_(list(o2.keys()), list(o.keys()))

        o3 = copy.copy(o)
        eq_(list(o3.keys()), list(o.keys()))


class OrderedSetTest(fixtures.TestBase):
    def test_mutators_against_iter(self):
        # testing a set modified against an iterator
        o = util.OrderedSet([3, 2, 4, 5])

        eq_(o.difference(iter([3, 4])), util.OrderedSet([2, 5]))
        eq_(o.intersection(iter([3, 4, 6])), util.OrderedSet([3, 4]))
        eq_(o.union(iter([3, 4, 6])), util.OrderedSet([2, 3, 4, 5, 6]))


class FrozenDictTest(fixtures.TestBase):
    def test_serialize(self):
        d = util.immutabledict({1: 2, 3: 4})
        for loads, dumps in picklers():
            print(loads(dumps(d)))


class MemoizedAttrTest(fixtures.TestBase):
    def test_memoized_property(self):
        val = [20]

        class Foo(object):
            @util.memoized_property
            def bar(self):
                v = val[0]
                val[0] += 1
                return v

        ne_(Foo.bar, None)
        f1 = Foo()
        assert "bar" not in f1.__dict__
        eq_(f1.bar, 20)
        eq_(f1.bar, 20)
        eq_(val[0], 21)
        eq_(f1.__dict__["bar"], 20)

    def test_memoized_instancemethod(self):
        val = [20]

        class Foo(object):
            @util.memoized_instancemethod
            def bar(self):
                v = val[0]
                val[0] += 1
                return v

        assert inspect.ismethod(Foo().bar)
        ne_(Foo.bar, None)
        f1 = Foo()
        assert "bar" not in f1.__dict__
        eq_(f1.bar(), 20)
        eq_(f1.bar(), 20)
        eq_(val[0], 21)

    def test_memoized_slots(self):
        canary = mock.Mock()

        class Foob(util.MemoizedSlots):
            __slots__ = ("foo_bar", "gogo")

            def _memoized_method_gogo(self):
                canary.method()
                return "gogo"

            def _memoized_attr_foo_bar(self):
                canary.attr()
                return "foobar"

        f1 = Foob()
        assert_raises(AttributeError, setattr, f1, "bar", "bat")

        eq_(f1.foo_bar, "foobar")

        eq_(f1.foo_bar, "foobar")

        eq_(f1.gogo(), "gogo")

        eq_(f1.gogo(), "gogo")

        eq_(canary.mock_calls, [mock.call.attr(), mock.call.method()])


class WrapCallableTest(fixtures.TestBase):
    def test_wrapping_update_wrapper_fn(self):
        def my_fancy_default():
            """run the fancy default"""
            return 10

        c = util.wrap_callable(lambda: my_fancy_default, my_fancy_default)

        eq_(c.__name__, "my_fancy_default")
        eq_(c.__doc__, "run the fancy default")

    def test_wrapping_update_wrapper_fn_nodocstring(self):
        def my_fancy_default():
            return 10

        c = util.wrap_callable(lambda: my_fancy_default, my_fancy_default)
        eq_(c.__name__, "my_fancy_default")
        eq_(c.__doc__, None)

    def test_wrapping_update_wrapper_cls(self):
        class MyFancyDefault(object):
            """a fancy default"""

            def __call__(self):
                """run the fancy default"""
                return 10

        def_ = MyFancyDefault()
        c = util.wrap_callable(lambda: def_(), def_)

        eq_(c.__name__, "MyFancyDefault")
        eq_(c.__doc__, "run the fancy default")

    def test_wrapping_update_wrapper_cls_noclsdocstring(self):
        class MyFancyDefault(object):
            def __call__(self):
                """run the fancy default"""
                return 10

        def_ = MyFancyDefault()
        c = util.wrap_callable(lambda: def_(), def_)
        eq_(c.__name__, "MyFancyDefault")
        eq_(c.__doc__, "run the fancy default")

    def test_wrapping_update_wrapper_cls_nomethdocstring(self):
        class MyFancyDefault(object):
            """a fancy default"""

            def __call__(self):
                return 10

        def_ = MyFancyDefault()
        c = util.wrap_callable(lambda: def_(), def_)
        eq_(c.__name__, "MyFancyDefault")
        eq_(c.__doc__, "a fancy default")

    def test_wrapping_update_wrapper_cls_noclsdocstring_nomethdocstring(self):
        class MyFancyDefault(object):
            def __call__(self):
                return 10

        def_ = MyFancyDefault()
        c = util.wrap_callable(lambda: def_(), def_)
        eq_(c.__name__, "MyFancyDefault")
        eq_(c.__doc__, None)

    def test_wrapping_update_wrapper_functools_parial(self):
        def my_default(x):
            return x

        import functools

        my_functools_default = functools.partial(my_default, 5)

        c = util.wrap_callable(
            lambda: my_functools_default(), my_functools_default
        )
        eq_(c.__name__, "partial")
        eq_(c.__doc__, my_functools_default.__call__.__doc__)
        eq_(c(), 5)


class ToListTest(fixtures.TestBase):
    def test_from_string(self):
        eq_(util.to_list("xyz"), ["xyz"])

    def test_from_set(self):
        spec = util.to_list(set([1, 2, 3]))
        assert isinstance(spec, list)
        eq_(sorted(spec), [1, 2, 3])

    def test_from_dict(self):
        spec = util.to_list({1: "a", 2: "b", 3: "c"})
        assert isinstance(spec, list)
        eq_(sorted(spec), [1, 2, 3])

    def test_from_tuple(self):
        eq_(util.to_list((1, 2, 3)), [1, 2, 3])

    def test_from_bytes(self):

        eq_(util.to_list(compat.b("abc")), [compat.b("abc")])

        eq_(
            util.to_list([compat.b("abc"), compat.b("def")]),
            [compat.b("abc"), compat.b("def")],
        )


class ColumnCollectionTest(testing.AssertsCompiledSQL, fixtures.TestBase):
    def test_in(self):
        cc = sql.ColumnCollection()
        cc.add(sql.column("col1"))
        cc.add(sql.column("col2"))
        cc.add(sql.column("col3"))
        assert "col1" in cc
        assert "col2" in cc

        try:
            cc["col1"] in cc
            assert False
        except exc.ArgumentError as e:
            eq_(str(e), "__contains__ requires a string argument")

    def test_compare(self):
        cc1 = sql.ColumnCollection()
        cc2 = sql.ColumnCollection()
        cc3 = sql.ColumnCollection()
        c1 = sql.column("col1")
        c2 = c1.label("col2")
        c3 = sql.column("col3")
        cc1.add(c1)
        cc2.add(c2)
        cc3.add(c3)
        assert (cc1 == cc2).compare(c1 == c2)
        assert not (cc1 == cc3).compare(c2 == c3)

    @testing.emits_warning("Column ")
    def test_dupes_add(self):
        cc = sql.ColumnCollection()

        c1, c2a, c3, c2b = (
            column("c1"),
            column("c2"),
            column("c3"),
            column("c2"),
        )

        cc.add(c1)
        cc.add(c2a)
        cc.add(c3)
        cc.add(c2b)

        eq_(cc._all_columns, [c1, c2a, c3, c2b])

        # for iter, c2a is replaced by c2b, ordering
        # is maintained in that way.  ideally, iter would be
        # the same as the "_all_columns" collection.
        eq_(list(cc), [c1, c2b, c3])

        assert cc.contains_column(c2a)
        assert cc.contains_column(c2b)

        ci = cc.as_immutable()
        eq_(ci._all_columns, [c1, c2a, c3, c2b])
        eq_(list(ci), [c1, c2b, c3])

    def test_identical_dupe_add(self):
        cc = sql.ColumnCollection()

        c1, c2, c3 = (column("c1"), column("c2"), column("c3"))

        cc.add(c1)
        cc.add(c2)
        cc.add(c3)
        cc.add(c2)

        eq_(cc._all_columns, [c1, c2, c3])

        self.assert_compile(
            cc == [c1, c2, c3], "c1 = c1 AND c2 = c2 AND c3 = c3"
        )

        # for iter, c2a is replaced by c2b, ordering
        # is maintained in that way.  ideally, iter would be
        # the same as the "_all_columns" collection.
        eq_(list(cc), [c1, c2, c3])

        assert cc.contains_column(c2)

        ci = cc.as_immutable()
        eq_(ci._all_columns, [c1, c2, c3])
        eq_(list(ci), [c1, c2, c3])

        self.assert_compile(
            ci == [c1, c2, c3], "c1 = c1 AND c2 = c2 AND c3 = c3"
        )

    def test_replace(self):
        cc = sql.ColumnCollection()

        c1, c2a, c3, c2b = (
            column("c1"),
            column("c2"),
            column("c3"),
            column("c2"),
        )

        cc.add(c1)
        cc.add(c2a)
        cc.add(c3)

        cc.replace(c2b)

        eq_(cc._all_columns, [c1, c2b, c3])
        eq_(list(cc), [c1, c2b, c3])

        assert not cc.contains_column(c2a)
        assert cc.contains_column(c2b)

        ci = cc.as_immutable()
        eq_(ci._all_columns, [c1, c2b, c3])
        eq_(list(ci), [c1, c2b, c3])

    def test_replace_key_matches(self):
        cc = sql.ColumnCollection()

        c1, c2a, c3, c2b = (
            column("c1"),
            column("c2"),
            column("c3"),
            column("X"),
        )
        c2b.key = "c2"

        cc.add(c1)
        cc.add(c2a)
        cc.add(c3)

        cc.replace(c2b)

        assert not cc.contains_column(c2a)
        assert cc.contains_column(c2b)

        eq_(cc._all_columns, [c1, c2b, c3])
        eq_(list(cc), [c1, c2b, c3])

        ci = cc.as_immutable()
        eq_(ci._all_columns, [c1, c2b, c3])
        eq_(list(ci), [c1, c2b, c3])

    def test_replace_name_matches(self):
        cc = sql.ColumnCollection()

        c1, c2a, c3, c2b = (
            column("c1"),
            column("c2"),
            column("c3"),
            column("c2"),
        )
        c2b.key = "X"

        cc.add(c1)
        cc.add(c2a)
        cc.add(c3)

        cc.replace(c2b)

        assert not cc.contains_column(c2a)
        assert cc.contains_column(c2b)

        eq_(cc._all_columns, [c1, c2b, c3])
        eq_(list(cc), [c1, c3, c2b])

        ci = cc.as_immutable()
        eq_(ci._all_columns, [c1, c2b, c3])
        eq_(list(ci), [c1, c3, c2b])

    def test_replace_no_match(self):
        cc = sql.ColumnCollection()

        c1, c2, c3, c4 = column("c1"), column("c2"), column("c3"), column("c4")
        c4.key = "X"

        cc.add(c1)
        cc.add(c2)
        cc.add(c3)

        cc.replace(c4)

        assert cc.contains_column(c2)
        assert cc.contains_column(c4)

        eq_(cc._all_columns, [c1, c2, c3, c4])
        eq_(list(cc), [c1, c2, c3, c4])

        ci = cc.as_immutable()
        eq_(ci._all_columns, [c1, c2, c3, c4])
        eq_(list(ci), [c1, c2, c3, c4])

    def test_dupes_extend(self):
        cc = sql.ColumnCollection()

        c1, c2a, c3, c2b = (
            column("c1"),
            column("c2"),
            column("c3"),
            column("c2"),
        )

        cc.add(c1)
        cc.add(c2a)

        cc.extend([c3, c2b])

        eq_(cc._all_columns, [c1, c2a, c3, c2b])

        # for iter, c2a is replaced by c2b, ordering
        # is maintained in that way.  ideally, iter would be
        # the same as the "_all_columns" collection.
        eq_(list(cc), [c1, c2b, c3])

        assert cc.contains_column(c2a)
        assert cc.contains_column(c2b)

        ci = cc.as_immutable()
        eq_(ci._all_columns, [c1, c2a, c3, c2b])
        eq_(list(ci), [c1, c2b, c3])

    def test_dupes_update(self):
        cc = sql.ColumnCollection()

        c1, c2a, c3, c2b = (
            column("c1"),
            column("c2"),
            column("c3"),
            column("c2"),
        )

        cc.add(c1)
        cc.add(c2a)

        cc.update([(c3.key, c3), (c2b.key, c2b)])

        eq_(cc._all_columns, [c1, c2a, c3, c2b])

        assert cc.contains_column(c2a)
        assert cc.contains_column(c2b)

        # for iter, c2a is replaced by c2b, ordering
        # is maintained in that way.  ideally, iter would be
        # the same as the "_all_columns" collection.
        eq_(list(cc), [c1, c2b, c3])

    def test_extend_existing(self):
        cc = sql.ColumnCollection()

        c1, c2, c3, c4, c5 = (
            column("c1"),
            column("c2"),
            column("c3"),
            column("c4"),
            column("c5"),
        )

        cc.extend([c1, c2])
        eq_(cc._all_columns, [c1, c2])

        cc.extend([c3])
        eq_(cc._all_columns, [c1, c2, c3])
        cc.extend([c4, c2, c5])

        eq_(cc._all_columns, [c1, c2, c3, c4, c5])

    def test_update_existing(self):
        cc = sql.ColumnCollection()

        c1, c2, c3, c4, c5 = (
            column("c1"),
            column("c2"),
            column("c3"),
            column("c4"),
            column("c5"),
        )

        cc.update([("c1", c1), ("c2", c2)])
        eq_(cc._all_columns, [c1, c2])

        cc.update([("c3", c3)])
        eq_(cc._all_columns, [c1, c2, c3])
        cc.update([("c4", c4), ("c2", c2), ("c5", c5)])

        eq_(cc._all_columns, [c1, c2, c3, c4, c5])


class LRUTest(fixtures.TestBase):
    def test_lru(self):
        class item(object):
            def __init__(self, id_):
                self.id = id_

            def __str__(self):
                return "item id %d" % self.id

        lru = util.LRUCache(10, threshold=0.2)

        for id_ in range(1, 20):
            lru[id_] = item(id_)

        # first couple of items should be gone
        assert 1 not in lru
        assert 2 not in lru

        # next batch over the threshold of 10 should be present
        for id_ in range(11, 20):
            assert id_ in lru

        lru[12]
        lru[15]
        lru[23] = item(23)
        lru[24] = item(24)
        lru[25] = item(25)
        lru[26] = item(26)
        lru[27] = item(27)

        assert 11 not in lru
        assert 13 not in lru

        for id_ in (25, 24, 23, 14, 12, 19, 18, 17, 16, 15):
            assert id_ in lru

        lru[25]
        i2 = item(25)
        lru[25] = i2
        assert 25 in lru
        assert lru[25] is i2


class ImmutableSubclass(str):
    pass


class FlattenIteratorTest(fixtures.TestBase):
    def test_flatten(self):
        assert list(util.flatten_iterator([[1, 2, 3], [4, 5, 6], 7, 8])) == [
            1,
            2,
            3,
            4,
            5,
            6,
            7,
            8,
        ]

    def test_str_with_iter(self):
        """ensure that a str object with an __iter__ method (like in
        PyPy) is not interpreted as an iterable.

        """

        class IterString(str):
            def __iter__(self):
                return iter(self + "")

        iter_list = [IterString("asdf"), [IterString("x"), IterString("y")]]

        assert list(util.flatten_iterator(iter_list)) == ["asdf", "x", "y"]


class HashOverride(object):
    def __init__(self, value=None):
        self.value = value

    def __hash__(self):
        return hash(self.value)


class NoHash(object):
    def __init__(self, value=None):
        self.value = value

    __hash__ = None


class EqOverride(object):
    def __init__(self, value=None):
        self.value = value

    __hash__ = object.__hash__

    def __eq__(self, other):
        if isinstance(other, EqOverride):
            return self.value == other.value
        else:
            return False

    def __ne__(self, other):
        if isinstance(other, EqOverride):
            return self.value != other.value
        else:
            return True


class HashEqOverride(object):
    def __init__(self, value=None):
        self.value = value

    def __hash__(self):
        return hash(self.value)

    def __eq__(self, other):
        if isinstance(other, EqOverride):
            return self.value == other.value
        else:
            return False

    def __ne__(self, other):
        if isinstance(other, EqOverride):
            return self.value != other.value
        else:
            return True


class IdentitySetTest(fixtures.TestBase):
    obj_type = object

    def assert_eq(self, identityset, expected_iterable):
        expected = sorted([id(o) for o in expected_iterable])
        found = sorted([id(o) for o in identityset])
        eq_(found, expected)

    def test_init(self):
        ids = util.IdentitySet([1, 2, 3, 2, 1])
        self.assert_eq(ids, [1, 2, 3])

        ids = util.IdentitySet(ids)
        self.assert_eq(ids, [1, 2, 3])

        ids = util.IdentitySet()
        self.assert_eq(ids, [])

        ids = util.IdentitySet([])
        self.assert_eq(ids, [])

        ids = util.IdentitySet(ids)
        self.assert_eq(ids, [])

    def test_add(self):
        for type_ in (object, ImmutableSubclass):
            data = [type_(), type_()]
            ids = util.IdentitySet()
            for i in list(range(2)) + list(range(2)):
                ids.add(data[i])
            self.assert_eq(ids, data)

        for type_ in (NoHash, EqOverride, HashOverride, HashEqOverride):
            data = [type_(1), type_(1), type_(2)]
            ids = util.IdentitySet()
            for i in list(range(3)) + list(range(3)):
                ids.add(data[i])
            self.assert_eq(ids, data)

    def test_dunder_sub2(self):
        IdentitySet = util.IdentitySet
        o1, o2, o3 = self.obj_type(), self.obj_type(), self.obj_type()
        ids1 = IdentitySet([o1])
        ids2 = IdentitySet([o1, o2, o3])
        eq_(ids2 - ids1, IdentitySet([o2, o3]))

        ids2 -= ids1
        eq_(ids2, IdentitySet([o2, o3]))

    def test_dunder_eq(self):
        _, _, twin1, twin2, unique1, unique2 = self._create_sets()

        # basic set math
        eq_(twin1 == twin2, True)
        eq_(unique1 == unique2, False)

        # not an IdentitySet
        not_an_identity_set = object()
        eq_(unique1 == not_an_identity_set, False)

    def test_dunder_ne(self):
        _, _, twin1, twin2, unique1, unique2 = self._create_sets()

        # basic set math
        eq_(twin1 != twin2, False)
        eq_(unique1 != unique2, True)

        # not an IdentitySet
        not_an_identity_set = object()
        eq_(unique1 != not_an_identity_set, True)

    def test_dunder_le(self):
        super_, sub_, twin1, twin2, unique1, unique2 = self._create_sets()

        # basic set math
        eq_(sub_ <= super_, True)
        eq_(super_ <= sub_, False)

        # the same sets
        eq_(twin1 <= twin2, True)
        eq_(twin2 <= twin1, True)

        # totally different sets
        eq_(unique1 <= unique2, False)
        eq_(unique2 <= unique1, False)

        # not an IdentitySet
        def should_raise():
            not_an_identity_set = object()
            return unique1 <= not_an_identity_set

        self._assert_unorderable_types(should_raise)

    def test_dunder_lt(self):
        super_, sub_, twin1, twin2, unique1, unique2 = self._create_sets()

        # basic set math
        eq_(sub_ < super_, True)
        eq_(super_ < sub_, False)

        # the same sets
        eq_(twin1 < twin2, False)
        eq_(twin2 < twin1, False)

        # totally different sets
        eq_(unique1 < unique2, False)
        eq_(unique2 < unique1, False)

        # not an IdentitySet
        def should_raise():
            not_an_identity_set = object()
            return unique1 < not_an_identity_set

        self._assert_unorderable_types(should_raise)

    def test_dunder_ge(self):
        super_, sub_, twin1, twin2, unique1, unique2 = self._create_sets()

        # basic set math
        eq_(sub_ >= super_, False)
        eq_(super_ >= sub_, True)

        # the same sets
        eq_(twin1 >= twin2, True)
        eq_(twin2 >= twin1, True)

        # totally different sets
        eq_(unique1 >= unique2, False)
        eq_(unique2 >= unique1, False)

        # not an IdentitySet
        def should_raise():
            not_an_identity_set = object()
            return unique1 >= not_an_identity_set

        self._assert_unorderable_types(should_raise)

    def test_dunder_gt(self):
        super_, sub_, twin1, twin2, unique1, unique2 = self._create_sets()

        # basic set math
        eq_(sub_ > super_, False)
        eq_(super_ > sub_, True)

        # the same sets
        eq_(twin1 > twin2, False)
        eq_(twin2 > twin1, False)

        # totally different sets
        eq_(unique1 > unique2, False)
        eq_(unique2 > unique1, False)

        # not an IdentitySet
        def should_raise():
            not_an_identity_set = object()
            return unique1 > not_an_identity_set

        self._assert_unorderable_types(should_raise)

    def test_issubset(self):
        super_, sub_, twin1, twin2, unique1, unique2 = self._create_sets()

        # basic set math
        eq_(sub_.issubset(super_), True)
        eq_(super_.issubset(sub_), False)

        # the same sets
        eq_(twin1.issubset(twin2), True)
        eq_(twin2.issubset(twin1), True)

        # totally different sets
        eq_(unique1.issubset(unique2), False)
        eq_(unique2.issubset(unique1), False)

        # not an IdentitySet
        not_an_identity_set = object()
        assert_raises(TypeError, unique1.issubset, not_an_identity_set)

    def test_issuperset(self):
        super_, sub_, twin1, twin2, unique1, unique2 = self._create_sets()

        # basic set math
        eq_(sub_.issuperset(super_), False)
        eq_(super_.issuperset(sub_), True)

        # the same sets
        eq_(twin1.issuperset(twin2), True)
        eq_(twin2.issuperset(twin1), True)

        # totally different sets
        eq_(unique1.issuperset(unique2), False)
        eq_(unique2.issuperset(unique1), False)

        # not an IdentitySet
        not_an_identity_set = object()
        assert_raises(TypeError, unique1.issuperset, not_an_identity_set)

    def test_union(self):
        super_, sub_, twin1, twin2, _, _ = self._create_sets()

        # basic set math
        eq_(sub_.union(super_), super_)
        eq_(super_.union(sub_), super_)

        # the same sets
        eq_(twin1.union(twin2), twin1)
        eq_(twin2.union(twin1), twin1)

        # empty sets
        empty = util.IdentitySet([])
        eq_(empty.union(empty), empty)

        # totally different sets
        unique1 = util.IdentitySet([1])
        unique2 = util.IdentitySet([2])
        eq_(unique1.union(unique2), util.IdentitySet([1, 2]))

        # not an IdentitySet
        not_an_identity_set = object()
        assert_raises(TypeError, unique1.union, not_an_identity_set)

    def test_dunder_or(self):
        super_, sub_, twin1, twin2, _, _ = self._create_sets()

        # basic set math
        eq_(sub_ | super_, super_)
        eq_(super_ | sub_, super_)

        # the same sets
        eq_(twin1 | twin2, twin1)
        eq_(twin2 | twin1, twin1)

        # empty sets
        empty = util.IdentitySet([])
        eq_(empty | empty, empty)

        # totally different sets
        unique1 = util.IdentitySet([1])
        unique2 = util.IdentitySet([2])
        eq_(unique1 | unique2, util.IdentitySet([1, 2]))

        # not an IdentitySet
        def should_raise():
            not_an_identity_set = object()
            return unique1 | not_an_identity_set

        assert_raises(TypeError, should_raise)

    def test_update(self):
        pass  # TODO

    def test_dunder_ior(self):
        super_, sub_, _, _, _, _ = self._create_sets()

        # basic set math
        sub_ |= super_
        eq_(sub_, super_)
        super_ |= sub_
        eq_(super_, super_)

        # totally different sets
        unique1 = util.IdentitySet([1])
        unique2 = util.IdentitySet([2])
        unique1 |= unique2
        eq_(unique1, util.IdentitySet([1, 2]))
        eq_(unique2, util.IdentitySet([2]))

        # not an IdentitySet
        def should_raise():
            unique = util.IdentitySet([1])
            not_an_identity_set = object()
            unique |= not_an_identity_set

        assert_raises(TypeError, should_raise)

    def test_difference(self):
        _, _, twin1, twin2, _, _ = self._create_sets()

        # basic set math
        set1 = util.IdentitySet([1, 2, 3])
        set2 = util.IdentitySet([2, 3, 4])
        eq_(set1.difference(set2), util.IdentitySet([1]))
        eq_(set2.difference(set1), util.IdentitySet([4]))

        # empty sets
        empty = util.IdentitySet([])
        eq_(empty.difference(empty), empty)

        # the same sets
        eq_(twin1.difference(twin2), empty)
        eq_(twin2.difference(twin1), empty)

        # totally different sets
        unique1 = util.IdentitySet([1])
        unique2 = util.IdentitySet([2])
        eq_(unique1.difference(unique2), util.IdentitySet([1]))
        eq_(unique2.difference(unique1), util.IdentitySet([2]))

        # not an IdentitySet
        not_an_identity_set = object()
        assert_raises(TypeError, unique1.difference, not_an_identity_set)

    def test_dunder_sub(self):
        _, _, twin1, twin2, _, _ = self._create_sets()

        # basic set math
        set1 = util.IdentitySet([1, 2, 3])
        set2 = util.IdentitySet([2, 3, 4])
        eq_(set1 - set2, util.IdentitySet([1]))
        eq_(set2 - set1, util.IdentitySet([4]))

        # empty sets
        empty = util.IdentitySet([])
        eq_(empty - empty, empty)

        # the same sets
        eq_(twin1 - twin2, empty)
        eq_(twin2 - twin1, empty)

        # totally different sets
        unique1 = util.IdentitySet([1])
        unique2 = util.IdentitySet([2])
        eq_(unique1 - unique2, util.IdentitySet([1]))
        eq_(unique2 - unique1, util.IdentitySet([2]))

        # not an IdentitySet
        def should_raise():
            not_an_identity_set = object()
            unique1 - not_an_identity_set

        assert_raises(TypeError, should_raise)

    def test_difference_update(self):
        pass  # TODO

    def test_dunder_isub(self):
        pass  # TODO

    def test_intersection(self):
        super_, sub_, twin1, twin2, unique1, unique2 = self._create_sets()

        # basic set math
        eq_(sub_.intersection(super_), sub_)
        eq_(super_.intersection(sub_), sub_)

        # the same sets
        eq_(twin1.intersection(twin2), twin1)
        eq_(twin2.intersection(twin1), twin1)

        # empty sets
        empty = util.IdentitySet([])
        eq_(empty.intersection(empty), empty)

        # totally different sets
        eq_(unique1.intersection(unique2), empty)

        # not an IdentitySet
        not_an_identity_set = object()
        assert_raises(TypeError, unique1.intersection, not_an_identity_set)

    def test_dunder_and(self):
        super_, sub_, twin1, twin2, unique1, unique2 = self._create_sets()

        # basic set math
        eq_(sub_ & super_, sub_)
        eq_(super_ & sub_, sub_)

        # the same sets
        eq_(twin1 & twin2, twin1)
        eq_(twin2 & twin1, twin1)

        # empty sets
        empty = util.IdentitySet([])
        eq_(empty & empty, empty)

        # totally different sets
        eq_(unique1 & unique2, empty)

        # not an IdentitySet
        def should_raise():
            not_an_identity_set = object()
            return unique1 & not_an_identity_set

        assert_raises(TypeError, should_raise)

    def test_intersection_update(self):
        pass  # TODO

    def test_dunder_iand(self):
        pass  # TODO

    def test_symmetric_difference(self):
        _, _, twin1, twin2, _, _ = self._create_sets()

        # basic set math
        set1 = util.IdentitySet([1, 2, 3])
        set2 = util.IdentitySet([2, 3, 4])
        eq_(set1.symmetric_difference(set2), util.IdentitySet([1, 4]))
        eq_(set2.symmetric_difference(set1), util.IdentitySet([1, 4]))

        # empty sets
        empty = util.IdentitySet([])
        eq_(empty.symmetric_difference(empty), empty)

        # the same sets
        eq_(twin1.symmetric_difference(twin2), empty)
        eq_(twin2.symmetric_difference(twin1), empty)

        # totally different sets
        unique1 = util.IdentitySet([1])
        unique2 = util.IdentitySet([2])
        eq_(unique1.symmetric_difference(unique2), util.IdentitySet([1, 2]))
        eq_(unique2.symmetric_difference(unique1), util.IdentitySet([1, 2]))

        # not an IdentitySet
        not_an_identity_set = object()
        assert_raises(
            TypeError, unique1.symmetric_difference, not_an_identity_set
        )

    def test_dunder_xor(self):
        _, _, twin1, twin2, _, _ = self._create_sets()

        # basic set math
        set1 = util.IdentitySet([1, 2, 3])
        set2 = util.IdentitySet([2, 3, 4])
        eq_(set1 ^ set2, util.IdentitySet([1, 4]))
        eq_(set2 ^ set1, util.IdentitySet([1, 4]))

        # empty sets
        empty = util.IdentitySet([])
        eq_(empty ^ empty, empty)

        # the same sets
        eq_(twin1 ^ twin2, empty)
        eq_(twin2 ^ twin1, empty)

        # totally different sets
        unique1 = util.IdentitySet([1])
        unique2 = util.IdentitySet([2])
        eq_(unique1 ^ unique2, util.IdentitySet([1, 2]))
        eq_(unique2 ^ unique1, util.IdentitySet([1, 2]))

        # not an IdentitySet
        def should_raise():
            not_an_identity_set = object()
            return unique1 ^ not_an_identity_set

        assert_raises(TypeError, should_raise)

    def test_symmetric_difference_update(self):
        pass  # TODO

    def _create_sets(self):
        o1, o2, o3, o4, o5 = (
            self.obj_type(),
            self.obj_type(),
            self.obj_type(),
            self.obj_type(),
            self.obj_type(),
        )
        super_ = util.IdentitySet([o1, o2, o3])
        sub_ = util.IdentitySet([o2])
        twin1 = util.IdentitySet([o3])
        twin2 = util.IdentitySet([o3])
        unique1 = util.IdentitySet([o4])
        unique2 = util.IdentitySet([o5])
        return super_, sub_, twin1, twin2, unique1, unique2

    def _assert_unorderable_types(self, callable_):
        if util.py36:
            assert_raises_message(
                TypeError, "not supported between instances of", callable_
            )
        elif util.py3k:
            assert_raises_message(TypeError, "unorderable types", callable_)
        else:
            assert_raises_message(
                TypeError, "cannot compare sets using cmp()", callable_
            )

    def test_basic_sanity(self):
        IdentitySet = util.IdentitySet

        o1, o2, o3 = self.obj_type(), self.obj_type(), self.obj_type()
        ids = IdentitySet([o1])
        ids.discard(o1)
        ids.discard(o1)
        ids.add(o1)
        ids.remove(o1)
        assert_raises(KeyError, ids.remove, o1)

        eq_(ids.copy(), ids)

        # explicit __eq__ and __ne__ tests
        assert ids != None  # noqa
        assert not (ids == None)  # noqa

        ne_(ids, IdentitySet([o1, o2, o3]))
        ids.clear()
        assert o1 not in ids
        ids.add(o2)
        assert o2 in ids
        eq_(ids.pop(), o2)
        ids.add(o1)
        eq_(len(ids), 1)

        isuper = IdentitySet([o1, o2])
        assert ids < isuper
        assert ids.issubset(isuper)
        assert isuper.issuperset(ids)
        assert isuper > ids

        eq_(ids.union(isuper), isuper)
        eq_(ids | isuper, isuper)
        eq_(isuper - ids, IdentitySet([o2]))
        eq_(isuper.difference(ids), IdentitySet([o2]))
        eq_(ids.intersection(isuper), IdentitySet([o1]))
        eq_(ids & isuper, IdentitySet([o1]))
        eq_(ids.symmetric_difference(isuper), IdentitySet([o2]))
        eq_(ids ^ isuper, IdentitySet([o2]))

        ids.update(isuper)
        ids |= isuper
        ids.difference_update(isuper)
        ids -= isuper
        ids.intersection_update(isuper)
        ids &= isuper
        ids.symmetric_difference_update(isuper)
        ids ^= isuper

        ids.update("foobar")
        try:
            ids |= "foobar"
            assert False
        except TypeError:
            assert True

        try:
            s = set([o1, o2])
            s |= ids
            assert False
        except TypeError:
            assert True

        assert_raises(TypeError, util.cmp, ids)
        assert_raises(TypeError, hash, ids)


class NoHashIdentitySetTest(IdentitySetTest):
    obj_type = NoHash


class OrderedIdentitySetTest(fixtures.TestBase):
    def assert_eq(self, identityset, expected_iterable):
        expected = [id(o) for o in expected_iterable]
        found = [id(o) for o in identityset]
        eq_(found, expected)

    def test_add(self):
        elem = object
        s = util.OrderedIdentitySet()
        s.add(elem())
        s.add(elem())

    def test_intersection(self):
        elem = object
        eq_ = self.assert_eq

        a, b, c, d, e, f, g = (
            elem(),
            elem(),
            elem(),
            elem(),
            elem(),
            elem(),
            elem(),
        )

        s1 = util.OrderedIdentitySet([a, b, c])
        s2 = util.OrderedIdentitySet([d, e, f])
        s3 = util.OrderedIdentitySet([a, d, f, g])
        eq_(s1.intersection(s2), [])
        eq_(s1.intersection(s3), [a])
        eq_(s1.union(s2).intersection(s3), [a, d, f])


class DictlikeIteritemsTest(fixtures.TestBase):
    baseline = set([("a", 1), ("b", 2), ("c", 3)])

    def _ok(self, instance):
        iterator = util.dictlike_iteritems(instance)
        eq_(set(iterator), self.baseline)

    def _notok(self, instance):
        assert_raises(TypeError, util.dictlike_iteritems, instance)

    def test_dict(self):
        d = dict(a=1, b=2, c=3)
        self._ok(d)

    def test_subdict(self):
        class subdict(dict):
            pass

        d = subdict(a=1, b=2, c=3)
        self._ok(d)

    if util.py2k:

        def test_UserDict(self):
            import UserDict

            d = UserDict.UserDict(a=1, b=2, c=3)
            self._ok(d)

    def test_object(self):
        self._notok(object())

    if util.py2k:

        def test_duck_1(self):
            class duck1(object):
                def iteritems(duck):
                    return iter(self.baseline)

            self._ok(duck1())

    def test_duck_2(self):
        class duck2(object):
            def items(duck):
                return list(self.baseline)

        self._ok(duck2())

    if util.py2k:

        def test_duck_3(self):
            class duck3(object):
                def iterkeys(duck):
                    return iter(["a", "b", "c"])

                def __getitem__(duck, key):
                    return dict(a=1, b=2, c=3).get(key)

            self._ok(duck3())

    def test_duck_4(self):
        class duck4(object):
            def iterkeys(duck):
                return iter(["a", "b", "c"])

        self._notok(duck4())

    def test_duck_5(self):
        class duck5(object):
            def keys(duck):
                return ["a", "b", "c"]

            def get(duck, key):
                return dict(a=1, b=2, c=3).get(key)

        self._ok(duck5())

    def test_duck_6(self):
        class duck6(object):
            def keys(duck):
                return ["a", "b", "c"]

        self._notok(duck6())


class DuckTypeCollectionTest(fixtures.TestBase):
    def test_sets(self):
        class SetLike(object):
            def add(self):
                pass

        class ForcedSet(list):
            __emulates__ = set

        for type_ in (set, SetLike, ForcedSet):
            eq_(util.duck_type_collection(type_), set)
            instance = type_()
            eq_(util.duck_type_collection(instance), set)

        for type_ in (frozenset,):
            is_(util.duck_type_collection(type_), None)
            instance = type_()
            is_(util.duck_type_collection(instance), None)


class PublicFactoryTest(fixtures.TestBase):
    def _fixture(self):
        class Thingy(object):
            def __init__(self, value):
                "make a thingy"
                self.value = value

            @classmethod
            def foobar(cls, x, y):
                "do the foobar"
                return Thingy(x + y)

        return Thingy

    def test_classmethod(self):
        Thingy = self._fixture()
        foob = langhelpers.public_factory(Thingy.foobar, ".sql.elements.foob")
        eq_(foob(3, 4).value, 7)
        eq_(foob(x=3, y=4).value, 7)
        eq_(foob.__doc__, "do the foobar")
        eq_(foob.__module__, "sqlalchemy.sql.elements")
        assert Thingy.foobar.__doc__.startswith("This function is mirrored;")

    def test_constructor(self):
        Thingy = self._fixture()
        foob = langhelpers.public_factory(Thingy, ".sql.elements.foob")
        eq_(foob(7).value, 7)
        eq_(foob(value=7).value, 7)
        eq_(foob.__doc__, "make a thingy")
        eq_(foob.__module__, "sqlalchemy.sql.elements")
        assert Thingy.__init__.__doc__.startswith(
            "Construct a new :class:`.Thingy` object."
        )


class ArgInspectionTest(fixtures.TestBase):
    def test_get_cls_kwargs(self):
        class A(object):
            def __init__(self, a):
                pass

        class A1(A):
            def __init__(self, a1):
                pass

        class A11(A1):
            def __init__(self, a11, **kw):
                pass

        class B(object):
            def __init__(self, b, **kw):
                pass

        class B1(B):
            def __init__(self, b1, **kw):
                pass

        class B2(B):
            def __init__(self, b2):
                pass

        class AB(A, B):
            def __init__(self, ab):
                pass

        class BA(B, A):
            def __init__(self, ba, **kwargs):
                pass

        class BA1(BA):
            pass

        class CAB(A, B):
            pass

        class CBA(B, A):
            pass

        class CB1A1(B1, A1):
            pass

        class CAB1(A, B1):
            pass

        class CB1A(B1, A):
            pass

        class CB2A(B2, A):
            pass

        class D(object):
            pass

        class BA2(B, A):
            pass

        class A11B1(A11, B1):
            pass

        def test(cls, *expected):
            eq_(set(util.get_cls_kwargs(cls)), set(expected))

        test(A, "a")
        test(A1, "a1")
        test(A11, "a11", "a1")
        test(B, "b")
        test(B1, "b1", "b")
        test(AB, "ab")
        test(BA, "ba", "b", "a")
        test(BA1, "ba", "b", "a")
        test(CAB, "a")
        test(CBA, "b", "a")
        test(CAB1, "a")
        test(CB1A, "b1", "b", "a")
        test(CB2A, "b2")
        test(CB1A1, "a1", "b1", "b")
        test(D)
        test(BA2, "a", "b")
        test(A11B1, "a1", "a11", "b", "b1")

    def test_get_func_kwargs(self):
        def f1():
            pass

        def f2(foo):
            pass

        def f3(*foo):
            pass

        def f4(**foo):
            pass

        def test(fn, *expected):
            eq_(set(util.get_func_kwargs(fn)), set(expected))

        test(f1)
        test(f2, "foo")
        test(f3)
        test(f4)

    def test_callable_argspec_fn(self):
        def foo(x, y, **kw):
            pass

        eq_(
            get_callable_argspec(foo),
            compat.FullArgSpec(["x", "y"], None, "kw", None, [], None, {}),
        )

    def test_callable_argspec_fn_no_self(self):
        def foo(x, y, **kw):
            pass

        eq_(
            get_callable_argspec(foo, no_self=True),
            compat.FullArgSpec(["x", "y"], None, "kw", None, [], None, {}),
        )

    def test_callable_argspec_fn_no_self_but_self(self):
        def foo(self, x, y, **kw):
            pass

        eq_(
            get_callable_argspec(foo, no_self=True),
            compat.FullArgSpec(
                ["self", "x", "y"], None, "kw", None, [], None, {}
            ),
        )

    @fails_if(lambda: util.pypy, "pypy returns plain *arg, **kw")
    def test_callable_argspec_py_builtin(self):
        import datetime

        assert_raises(TypeError, get_callable_argspec, datetime.datetime.now)

    @fails_if(lambda: util.pypy, "pypy returns plain *arg, **kw")
    def test_callable_argspec_obj_init(self):
        assert_raises(TypeError, get_callable_argspec, object)

    def test_callable_argspec_method(self):
        class Foo(object):
            def foo(self, x, y, **kw):
                pass

        eq_(
            get_callable_argspec(Foo.foo),
            compat.FullArgSpec(
                ["self", "x", "y"], None, "kw", None, [], None, {}
            ),
        )

    def test_callable_argspec_instance_method_no_self(self):
        class Foo(object):
            def foo(self, x, y, **kw):
                pass

        eq_(
            get_callable_argspec(Foo().foo, no_self=True),
            compat.FullArgSpec(["x", "y"], None, "kw", None, [], None, {}),
        )

    def test_callable_argspec_unbound_method_no_self(self):
        class Foo(object):
            def foo(self, x, y, **kw):
                pass

        eq_(
            get_callable_argspec(Foo.foo, no_self=True),
            compat.FullArgSpec(
                ["self", "x", "y"], None, "kw", None, [], None, {}
            ),
        )

    def test_callable_argspec_init(self):
        class Foo(object):
            def __init__(self, x, y):
                pass

        eq_(
            get_callable_argspec(Foo),
            compat.FullArgSpec(
                ["self", "x", "y"], None, None, None, [], None, {}
            ),
        )

    def test_callable_argspec_init_no_self(self):
        class Foo(object):
            def __init__(self, x, y):
                pass

        eq_(
            get_callable_argspec(Foo, no_self=True),
            compat.FullArgSpec(["x", "y"], None, None, None, [], None, {}),
        )

    def test_callable_argspec_call(self):
        class Foo(object):
            def __call__(self, x, y):
                pass

        eq_(
            get_callable_argspec(Foo()),
            compat.FullArgSpec(
                ["self", "x", "y"], None, None, None, [], None, {}
            ),
        )

    def test_callable_argspec_call_no_self(self):
        class Foo(object):
            def __call__(self, x, y):
                pass

        eq_(
            get_callable_argspec(Foo(), no_self=True),
            compat.FullArgSpec(["x", "y"], None, None, None, [], None, {}),
        )

    @fails_if(lambda: util.pypy, "pypy returns plain *arg, **kw")
    def test_callable_argspec_partial(self):
        from functools import partial

        def foo(x, y, z, **kw):
            pass

        bar = partial(foo, 5)

        assert_raises(TypeError, get_callable_argspec, bar)

    def test_getargspec_6_tuple(self):
        def foo(x, y, z, **kw):
            pass

        spec = compat.inspect_getfullargspec(foo)

        eq_(
            spec,
            compat.FullArgSpec(
                args=["x", "y", "z"],
                varargs=None,
                varkw="kw",
                defaults=None,
                kwonlyargs=[],
                kwonlydefaults=None,
                annotations={},
            ),
        )


class SymbolTest(fixtures.TestBase):
    def test_basic(self):
        sym1 = util.symbol("foo")
        assert sym1.name == "foo"
        sym2 = util.symbol("foo")

        assert sym1 is sym2
        assert sym1 == sym2

        sym3 = util.symbol("bar")
        assert sym1 is not sym3
        assert sym1 != sym3

    def test_pickle(self):
        sym1 = util.symbol("foo")
        sym2 = util.symbol("foo")

        assert sym1 is sym2

        # default
        s = util.pickle.dumps(sym1)
        util.pickle.loads(s)

        for protocol in 0, 1, 2:
            print(protocol)
            serial = util.pickle.dumps(sym1)
            rt = util.pickle.loads(serial)
            assert rt is sym1
            assert rt is sym2

    def test_bitflags(self):
        sym1 = util.symbol("sym1", canonical=1)
        sym2 = util.symbol("sym2", canonical=2)

        assert sym1 & sym1
        assert not sym1 & sym2
        assert not sym1 & sym1 & sym2

    def test_composites(self):
        sym1 = util.symbol("sym1", canonical=1)
        sym2 = util.symbol("sym2", canonical=2)
        sym3 = util.symbol("sym3", canonical=4)
        sym4 = util.symbol("sym4", canonical=8)

        assert sym1 & (sym2 | sym1 | sym4)
        assert not sym1 & (sym2 | sym3)

        assert not (sym1 | sym2) & (sym3 | sym4)
        assert (sym1 | sym2) & (sym2 | sym4)

    def test_parser(self):
        sym1 = util.symbol("sym1", canonical=1)
        sym2 = util.symbol("sym2", canonical=2)
        sym3 = util.symbol("sym3", canonical=4)
        sym4 = util.symbol("sym4", canonical=8)

        lookup_one = {sym1: [], sym2: [True], sym3: [False], sym4: [None]}
        lookup_two = {sym1: [], sym2: [True], sym3: [False]}
        lookup_three = {sym1: [], sym2: ["symbol2"], sym3: []}

        is_(
            util.symbol.parse_user_argument(
                "sym2", lookup_one, "some_name", resolve_symbol_names=True
            ),
            sym2,
        )

        assert_raises_message(
            exc.ArgumentError,
            "Invalid value for 'some_name': 'sym2'",
            util.symbol.parse_user_argument,
            "sym2",
            lookup_one,
            "some_name",
        )
        is_(
            util.symbol.parse_user_argument(
                True, lookup_one, "some_name", resolve_symbol_names=False
            ),
            sym2,
        )

        is_(
            util.symbol.parse_user_argument(sym2, lookup_one, "some_name"),
            sym2,
        )

        is_(
            util.symbol.parse_user_argument(None, lookup_one, "some_name"),
            sym4,
        )

        is_(
            util.symbol.parse_user_argument(None, lookup_two, "some_name"),
            None,
        )

        is_(
            util.symbol.parse_user_argument(
                "symbol2", lookup_three, "some_name"
            ),
            sym2,
        )

        assert_raises_message(
            exc.ArgumentError,
            "Invalid value for 'some_name': 'foo'",
            util.symbol.parse_user_argument,
            "foo",
            lookup_three,
            "some_name",
        )


class _Py3KFixtures(object):
    pass


if util.py3k:
    _locals = {}
    exec(
        """
def _kw_only_fixture(self, a, *, b, c):
    pass

def _kw_plus_posn_fixture(self, a, *args, b, c):
    pass

def _kw_opt_fixture(self, a, *, b, c="c"):
    pass
""",
        _locals,
    )
    for k in _locals:
        setattr(_Py3KFixtures, k, _locals[k])


class TestFormatArgspec(_Py3KFixtures, fixtures.TestBase):
    def _test_format_argspec_plus(self, fn, wanted, grouped=None):

        # test direct function
        if grouped is None:
            parsed = util.format_argspec_plus(fn)
        else:
            parsed = util.format_argspec_plus(fn, grouped=grouped)
        eq_(parsed, wanted)

        # test sending fullargspec
        spec = compat.inspect_getfullargspec(fn)
        if grouped is None:
            parsed = util.format_argspec_plus(spec)
        else:
            parsed = util.format_argspec_plus(spec, grouped=grouped)
        eq_(parsed, wanted)

    def test_specs(self):
        self._test_format_argspec_plus(
            lambda: None,
            {
                "args": "()",
                "self_arg": None,
                "apply_kw": "()",
                "apply_pos": "()",
            },
        )

        self._test_format_argspec_plus(
            lambda: None,
            {"args": "", "self_arg": None, "apply_kw": "", "apply_pos": ""},
            grouped=False,
        )

        self._test_format_argspec_plus(
            lambda self: None,
            {
                "args": "(self)",
                "self_arg": "self",
                "apply_kw": "(self)",
                "apply_pos": "(self)",
            },
        )

        self._test_format_argspec_plus(
            lambda self: None,
            {
                "args": "self",
                "self_arg": "self",
                "apply_kw": "self",
                "apply_pos": "self",
            },
            grouped=False,
        )

        self._test_format_argspec_plus(
            lambda *a: None,
            {
                "args": "(*a)",
                "self_arg": "a[0]",
                "apply_kw": "(*a)",
                "apply_pos": "(*a)",
            },
        )

        self._test_format_argspec_plus(
            lambda **kw: None,
            {
                "args": "(**kw)",
                "self_arg": None,
                "apply_kw": "(**kw)",
                "apply_pos": "(**kw)",
            },
        )

        self._test_format_argspec_plus(
            lambda *a, **kw: None,
            {
                "args": "(*a, **kw)",
                "self_arg": "a[0]",
                "apply_kw": "(*a, **kw)",
                "apply_pos": "(*a, **kw)",
            },
        )

        self._test_format_argspec_plus(
            lambda a, *b: None,
            {
                "args": "(a, *b)",
                "self_arg": "a",
                "apply_kw": "(a, *b)",
                "apply_pos": "(a, *b)",
            },
        )

        self._test_format_argspec_plus(
            lambda a, **b: None,
            {
                "args": "(a, **b)",
                "self_arg": "a",
                "apply_kw": "(a, **b)",
                "apply_pos": "(a, **b)",
            },
        )

        self._test_format_argspec_plus(
            lambda a, *b, **c: None,
            {
                "args": "(a, *b, **c)",
                "self_arg": "a",
                "apply_kw": "(a, *b, **c)",
                "apply_pos": "(a, *b, **c)",
            },
        )

        self._test_format_argspec_plus(
            lambda a, b=1, **c: None,
            {
                "args": "(a, b=1, **c)",
                "self_arg": "a",
                "apply_kw": "(a, b=b, **c)",
                "apply_pos": "(a, b, **c)",
            },
        )

        self._test_format_argspec_plus(
            lambda a=1, b=2: None,
            {
                "args": "(a=1, b=2)",
                "self_arg": "a",
                "apply_kw": "(a=a, b=b)",
                "apply_pos": "(a, b)",
            },
        )

        self._test_format_argspec_plus(
            lambda a=1, b=2: None,
            {
                "args": "a=1, b=2",
                "self_arg": "a",
                "apply_kw": "a=a, b=b",
                "apply_pos": "a, b",
            },
            grouped=False,
        )

        if util.py3k:
            self._test_format_argspec_plus(
                self._kw_only_fixture,
                {
                    "args": "self, a, *, b, c",
                    "self_arg": "self",
                    "apply_pos": "self, a, *, b, c",
                    "apply_kw": "self, a, b=b, c=c",
                },
                grouped=False,
            )
            self._test_format_argspec_plus(
                self._kw_plus_posn_fixture,
                {
                    "args": "self, a, *args, b, c",
                    "self_arg": "self",
                    "apply_pos": "self, a, *args, b, c",
                    "apply_kw": "self, a, b=b, c=c, *args",
                },
                grouped=False,
            )
            self._test_format_argspec_plus(
                self._kw_opt_fixture,
                {
                    "args": "self, a, *, b, c='c'",
                    "self_arg": "self",
                    "apply_pos": "self, a, *, b, c",
                    "apply_kw": "self, a, b=b, c=c",
                },
                grouped=False,
            )

    @testing.fails_if(
        lambda: util.pypy,
        "pypy doesn't report Obj.__init__ as object.__init__",
    )
    def test_init_grouped(self):
        object_spec = {
            "args": "(self)",
            "self_arg": "self",
            "apply_pos": "(self)",
            "apply_kw": "(self)",
        }
        wrapper_spec = {
            "args": "(self, *args, **kwargs)",
            "self_arg": "self",
            "apply_pos": "(self, *args, **kwargs)",
            "apply_kw": "(self, *args, **kwargs)",
        }
        custom_spec = {
            "args": "(slef, a=123)",
            "self_arg": "slef",  # yes, slef
            "apply_pos": "(slef, a)",
            "apply_kw": "(slef, a=a)",
        }

        self._test_init(None, object_spec, wrapper_spec, custom_spec)
        self._test_init(True, object_spec, wrapper_spec, custom_spec)

    @testing.fails_if(
        lambda: util.pypy,
        "pypy doesn't report Obj.__init__ as object.__init__",
    )
    def test_init_bare(self):
        object_spec = {
            "args": "self",
            "self_arg": "self",
            "apply_pos": "self",
            "apply_kw": "self",
        }
        wrapper_spec = {
            "args": "self, *args, **kwargs",
            "self_arg": "self",
            "apply_pos": "self, *args, **kwargs",
            "apply_kw": "self, *args, **kwargs",
        }
        custom_spec = {
            "args": "slef, a=123",
            "self_arg": "slef",  # yes, slef
            "apply_pos": "slef, a",
            "apply_kw": "slef, a=a",
        }

        self._test_init(False, object_spec, wrapper_spec, custom_spec)

    def _test_init(self, grouped, object_spec, wrapper_spec, custom_spec):
        def test(fn, wanted):
            if grouped is None:
                parsed = util.format_argspec_init(fn)
            else:
                parsed = util.format_argspec_init(fn, grouped=grouped)
            eq_(parsed, wanted)

        class Obj(object):
            pass

        test(Obj.__init__, object_spec)

        class Obj(object):
            def __init__(self):
                pass

        test(Obj.__init__, object_spec)

        class Obj(object):
            def __init__(slef, a=123):
                pass

        test(Obj.__init__, custom_spec)

        class Obj(list):
            pass

        test(Obj.__init__, wrapper_spec)

        class Obj(list):
            def __init__(self, *args, **kwargs):
                pass

        test(Obj.__init__, wrapper_spec)

        class Obj(list):
            def __init__(self):
                pass

        test(Obj.__init__, object_spec)

        class Obj(list):
            def __init__(slef, a=123):
                pass

        test(Obj.__init__, custom_spec)


class GenericReprTest(fixtures.TestBase):
    def test_all_positional(self):
        class Foo(object):
            def __init__(self, a, b, c):
                self.a = a
                self.b = b
                self.c = c

        eq_(util.generic_repr(Foo(1, 2, 3)), "Foo(1, 2, 3)")

    def test_positional_plus_kw(self):
        class Foo(object):
            def __init__(self, a, b, c=5, d=4):
                self.a = a
                self.b = b
                self.c = c
                self.d = d

        eq_(util.generic_repr(Foo(1, 2, 3, 6)), "Foo(1, 2, c=3, d=6)")

    def test_kw_defaults(self):
        class Foo(object):
            def __init__(self, a=1, b=2, c=3, d=4):
                self.a = a
                self.b = b
                self.c = c
                self.d = d

        eq_(util.generic_repr(Foo(1, 5, 3, 7)), "Foo(b=5, d=7)")

    def test_multi_kw(self):
        class Foo(object):
            def __init__(self, a, b, c=3, d=4):
                self.a = a
                self.b = b
                self.c = c
                self.d = d

        class Bar(Foo):
            def __init__(self, e, f, g=5, **kw):
                self.e = e
                self.f = f
                self.g = g
                super(Bar, self).__init__(**kw)

        eq_(
            util.generic_repr(
                Bar("e", "f", g=7, a=6, b=5, d=9), to_inspect=[Bar, Foo]
            ),
            "Bar('e', 'f', g=7, a=6, b=5, d=9)",
        )

        eq_(
            util.generic_repr(Bar("e", "f", a=6, b=5), to_inspect=[Bar, Foo]),
            "Bar('e', 'f', a=6, b=5)",
        )

    def test_multi_kw_repeated(self):
        class Foo(object):
            def __init__(self, a=1, b=2):
                self.a = a
                self.b = b

        class Bar(Foo):
            def __init__(self, b=3, c=4, **kw):
                self.c = c
                super(Bar, self).__init__(b=b, **kw)

        eq_(
            util.generic_repr(Bar(a="a", b="b", c="c"), to_inspect=[Bar, Foo]),
            "Bar(b='b', c='c', a='a')",
        )

    def test_discard_vargs(self):
        class Foo(object):
            def __init__(self, a, b, *args):
                self.a = a
                self.b = b
                self.c, self.d = args[0:2]

        eq_(util.generic_repr(Foo(1, 2, 3, 4)), "Foo(1, 2)")

    def test_discard_vargs_kwargs(self):
        class Foo(object):
            def __init__(self, a, b, *args, **kw):
                self.a = a
                self.b = b
                self.c, self.d = args[0:2]

        eq_(util.generic_repr(Foo(1, 2, 3, 4, x=7, y=4)), "Foo(1, 2)")

    def test_significant_vargs(self):
        class Foo(object):
            def __init__(self, a, b, *args):
                self.a = a
                self.b = b
                self.args = args

        eq_(util.generic_repr(Foo(1, 2, 3, 4)), "Foo(1, 2, 3, 4)")

    def test_no_args(self):
        class Foo(object):
            def __init__(self):
                pass

        eq_(util.generic_repr(Foo()), "Foo()")

    def test_no_init(self):
        class Foo(object):
            pass

        eq_(util.generic_repr(Foo()), "Foo()")


class AsInterfaceTest(fixtures.TestBase):
    class Something(object):
        def _ignoreme(self):
            pass

        def foo(self):
            pass

        def bar(self):
            pass

    class Partial(object):
        def bar(self):
            pass

    class Object(object):
        pass

    def test_no_cls_no_methods(self):
        obj = object()
        assert_raises(TypeError, util.as_interface, obj)

    def test_instance(self):
        obj = object()
        assert_raises(TypeError, util.as_interface, obj, cls=self.Something)

        assert_raises(TypeError, util.as_interface, obj, methods=("foo"))

        assert_raises(
            TypeError,
            util.as_interface,
            obj,
            cls=self.Something,
            required=("foo"),
        )

        obj = self.Something()
        eq_(obj, util.as_interface(obj, cls=self.Something))
        eq_(obj, util.as_interface(obj, methods=("foo",)))
        eq_(
            obj,
            util.as_interface(
                obj, cls=self.Something, required=("outofband",)
            ),
        )
        partial = self.Partial()

        slotted = self.Object()
        slotted.bar = lambda self: 123

        for obj in partial, slotted:
            eq_(obj, util.as_interface(obj, cls=self.Something))
            assert_raises(TypeError, util.as_interface, obj, methods=("foo"))
            eq_(obj, util.as_interface(obj, methods=("bar",)))
            eq_(
                obj,
                util.as_interface(obj, cls=self.Something, required=("bar",)),
            )
            assert_raises(
                TypeError,
                util.as_interface,
                obj,
                cls=self.Something,
                required=("foo",),
            )

            assert_raises(
                TypeError,
                util.as_interface,
                obj,
                cls=self.Something,
                required=self.Something,
            )

    def test_dict(self):
        obj = {}
        assert_raises(TypeError, util.as_interface, obj, cls=self.Something)
        assert_raises(TypeError, util.as_interface, obj, methods="foo")
        assert_raises(
            TypeError,
            util.as_interface,
            obj,
            cls=self.Something,
            required="foo",
        )

        def assertAdapted(obj, *methods):
            assert isinstance(obj, type)
            found = set([m for m in dir(obj) if not m.startswith("_")])
            for method in methods:
                assert method in found
                found.remove(method)
            assert not found

        def fn(self):
            return 123

        obj = {"foo": fn, "bar": fn}
        res = util.as_interface(obj, cls=self.Something)
        assertAdapted(res, "foo", "bar")
        res = util.as_interface(
            obj, cls=self.Something, required=self.Something
        )
        assertAdapted(res, "foo", "bar")
        res = util.as_interface(obj, cls=self.Something, required=("foo",))
        assertAdapted(res, "foo", "bar")
        res = util.as_interface(obj, methods=("foo", "bar"))
        assertAdapted(res, "foo", "bar")
        res = util.as_interface(obj, methods=("foo", "bar", "baz"))
        assertAdapted(res, "foo", "bar")
        res = util.as_interface(obj, methods=("foo", "bar"), required=("foo",))
        assertAdapted(res, "foo", "bar")
        assert_raises(TypeError, util.as_interface, obj, methods=("foo",))
        assert_raises(
            TypeError,
            util.as_interface,
            obj,
            methods=("foo", "bar", "baz"),
            required=("baz",),
        )
        obj = {"foo": 123}
        assert_raises(TypeError, util.as_interface, obj, cls=self.Something)


class TestClassHierarchy(fixtures.TestBase):
    def test_object(self):
        eq_(set(util.class_hierarchy(object)), set((object,)))

    def test_single(self):
        class A(object):
            pass

        class B(object):
            pass

        eq_(set(util.class_hierarchy(A)), set((A, object)))
        eq_(set(util.class_hierarchy(B)), set((B, object)))

        class C(A, B):
            pass

        eq_(set(util.class_hierarchy(A)), set((A, B, C, object)))
        eq_(set(util.class_hierarchy(B)), set((A, B, C, object)))

    if util.py2k:

        def test_oldstyle_mixin(self):
            class A(object):
                pass

            class Mixin:
                pass

            class B(A, Mixin):
                pass

            eq_(set(util.class_hierarchy(B)), set((A, B, object)))
            eq_(set(util.class_hierarchy(Mixin)), set())
            eq_(set(util.class_hierarchy(A)), set((A, B, object)))


class ReraiseTest(fixtures.TestBase):
    @testing.requires.python3
    def test_raise_from_cause_same_cause(self):
        class MyException(Exception):
            pass

        def go():
            try:
                raise MyException("exc one")
            except Exception as err:
                util.raise_from_cause(err)

        try:
            go()
            assert False
        except MyException as err:
            is_(err.__cause__, None)

    def test_raise_from_cause_legacy(self):
        class MyException(Exception):
            pass

        class MyOtherException(Exception):
            pass

        me = MyException("exc on")

        def go():
            try:
                raise me
            except Exception:
                util.raise_from_cause(MyOtherException("exc two"))

        try:
            go()
            assert False
        except MyOtherException as moe:
            if testing.requires.python3.enabled:
                is_(moe.__cause__, me)

    def test_raise_from(self):
        class MyException(Exception):
            pass

        class MyOtherException(Exception):
            pass

        me = MyException("exc on")

        def go():
            try:
                raise me
            except Exception as err:
                util.raise_(MyOtherException("exc two"), from_=err)

        try:
            go()
            assert False
        except MyOtherException as moe:
            if testing.requires.python3.enabled:
                is_(moe.__cause__, me)

    @testing.requires.python2
    def test_safe_reraise_py2k_warning(self):
        class MyException(Exception):
            pass

        class MyOtherException(Exception):
            pass

        m1 = MyException("exc one")
        m2 = MyOtherException("exc two")

        def go2():
            raise m2

        def go():
            try:
                raise m1
            except Exception:
                with util.safe_reraise():
                    go2()

        with expect_warnings(
            "An exception has occurred during handling of a previous "
            "exception.  The previous exception "
            "is:.*MyException.*exc one"
        ):
            try:
                go()
                assert False
            except MyOtherException:
                pass


class TestClassProperty(fixtures.TestBase):
    def test_simple(self):
        class A(object):
            something = {"foo": 1}

        class B(A):
            @classproperty
            def something(cls):
                d = dict(super(B, cls).something)
                d.update({"bazz": 2})
                return d

        eq_(B.something, {"foo": 1, "bazz": 2})


class TestProperties(fixtures.TestBase):
    def test_pickle(self):
        data = {"hello": "bla"}
        props = util.Properties(data)

        for loader, dumper in picklers():
            s = dumper(props)
            p = loader(s)

            eq_(props._data, p._data)
            eq_(props.keys(), p.keys())

    def test_keys_in_dir(self):
        data = {"hello": "bla"}
        props = util.Properties(data)
        in_("hello", dir(props))

    def test_pickle_immuatbleprops(self):
        data = {"hello": "bla"}
        props = util.Properties(data).as_immutable()

        for loader, dumper in picklers():
            s = dumper(props)
            p = loader(s)

            eq_(props._data, p._data)
            eq_(props.keys(), p.keys())

    def test_pickle_orderedprops(self):
        data = {"hello": "bla"}
        props = util.OrderedProperties()
        props.update(data)

        for loader, dumper in picklers():
            s = dumper(props)
            p = loader(s)

            eq_(props._data, p._data)
            eq_(props.keys(), p.keys())


class QuotedTokenParserTest(fixtures.TestBase):
    def _test(self, string, expected):
        eq_(langhelpers.quoted_token_parser(string), expected)

    def test_single(self):
        self._test("name", ["name"])

    def test_dotted(self):
        self._test("schema.name", ["schema", "name"])

    def test_dotted_quoted_left(self):
        self._test('"Schema".name', ["Schema", "name"])

    def test_dotted_quoted_left_w_quote_left_edge(self):
        self._test('"""Schema".name', ['"Schema', "name"])

    def test_dotted_quoted_left_w_quote_right_edge(self):
        self._test('"Schema""".name', ['Schema"', "name"])

    def test_dotted_quoted_left_w_quote_middle(self):
        self._test('"Sch""ema".name', ['Sch"ema', "name"])

    def test_dotted_quoted_right(self):
        self._test('schema."SomeName"', ["schema", "SomeName"])

    def test_dotted_quoted_right_w_quote_left_edge(self):
        self._test('schema."""name"', ["schema", '"name'])

    def test_dotted_quoted_right_w_quote_right_edge(self):
        self._test('schema."name"""', ["schema", 'name"'])

    def test_dotted_quoted_right_w_quote_middle(self):
        self._test('schema."na""me"', ["schema", 'na"me'])

    def test_quoted_single_w_quote_left_edge(self):
        self._test('"""name"', ['"name'])

    def test_quoted_single_w_quote_right_edge(self):
        self._test('"name"""', ['name"'])

    def test_quoted_single_w_quote_middle(self):
        self._test('"na""me"', ['na"me'])

    def test_dotted_quoted_left_w_dot_left_edge(self):
        self._test('".Schema".name', [".Schema", "name"])

    def test_dotted_quoted_left_w_dot_right_edge(self):
        self._test('"Schema.".name', ["Schema.", "name"])

    def test_dotted_quoted_left_w_dot_middle(self):
        self._test('"Sch.ema".name', ["Sch.ema", "name"])

    def test_dotted_quoted_right_w_dot_left_edge(self):
        self._test('schema.".name"', ["schema", ".name"])

    def test_dotted_quoted_right_w_dot_right_edge(self):
        self._test('schema."name."', ["schema", "name."])

    def test_dotted_quoted_right_w_dot_middle(self):
        self._test('schema."na.me"', ["schema", "na.me"])

    def test_quoted_single_w_dot_left_edge(self):
        self._test('".name"', [".name"])

    def test_quoted_single_w_dot_right_edge(self):
        self._test('"name."', ["name."])

    def test_quoted_single_w_dot_middle(self):
        self._test('"na.me"', ["na.me"])


class BackslashReplaceTest(fixtures.TestBase):
    def test_ascii_to_utf8(self):
        eq_(
            compat.decode_backslashreplace(util.b("hello world"), "utf-8"),
            util.u("hello world"),
        )

    def test_utf8_to_utf8(self):
        eq_(
            compat.decode_backslashreplace(
                util.u("some message méil").encode("utf-8"), "utf-8"
            ),
            util.u("some message méil"),
        )

    def test_latin1_to_utf8(self):
        eq_(
            compat.decode_backslashreplace(
                util.u("some message méil").encode("latin-1"), "utf-8"
            ),
            util.u("some message m\\xe9il"),
        )

        eq_(
            compat.decode_backslashreplace(
                util.u("some message méil").encode("latin-1"), "latin-1"
            ),
            util.u("some message méil"),
        )

    def test_cp1251_to_utf8(self):
        message = util.u("some message П").encode("cp1251")
        eq_(message, b"some message \xcf")
        eq_(
            compat.decode_backslashreplace(message, "utf-8"),
            util.u("some message \\xcf"),
        )

        eq_(
            compat.decode_backslashreplace(message, "cp1251"),
            util.u("some message П"),
        )


class TimezoneTest(fixtures.TestBase):
    """test the python 2 backport of the "timezone" class.

    Note under python 3, these tests work against the builtin timezone,
    thereby providing confirmation that the tests are correct.

    """

    @testing.combinations(
        (datetime.timedelta(0), "UTC"),
        (datetime.timedelta(hours=5), "UTC+05:00"),
        (datetime.timedelta(hours=5, minutes=10), "UTC+05:10"),
        (
            datetime.timedelta(hours=5, minutes=10, seconds=27),
            "UTC+05:10:27",
            testing.requires.granular_timezone,
        ),
        (datetime.timedelta(hours=-3, minutes=10), "UTC-02:50"),
        (
            datetime.timedelta(
                hours=5, minutes=10, seconds=27, microseconds=550
            ),
            "UTC+05:10:27.000550",
            testing.requires.granular_timezone,
        ),
    )
    def test_tzname(self, td, expected):
        if expected == "UTC" and util.py3k and not util.py36:
            expected += "+00:00"
        eq_(timezone(td).tzname(None), expected)

    def test_utcoffset(self):
        eq_(
            timezone(datetime.timedelta(hours=5)).utcoffset(None),
            datetime.timedelta(hours=5),
        )

    def test_fromutc(self):
        tzinfo = timezone(datetime.timedelta(hours=5))
        dt = datetime.datetime(2017, 10, 5, 12, 55, 38, tzinfo=tzinfo)
        eq_(
            dt.astimezone(timezone.utc),
            datetime.datetime(2017, 10, 5, 7, 55, 38, tzinfo=timezone.utc),
        )

        # this is the same as hours=-3
        del_ = datetime.timedelta(days=-1, seconds=75600)
        eq_(
            dt.astimezone(timezone(datetime.timedelta(hours=-3))),
            datetime.datetime(2017, 10, 5, 4, 55, 38, tzinfo=timezone(del_)),
        )

    @testing.requires.python3
    def test_repr_py3k(self):
        eq_(
            repr(timezone(datetime.timedelta(hours=5))),
            "datetime.timezone(%r)" % (datetime.timedelta(hours=5)),
        )

    @testing.requires.python2
    def test_repr_py2k(self):
        eq_(
            repr(timezone(datetime.timedelta(hours=5))),
            "sqlalchemy.util.timezone(%r)" % (datetime.timedelta(hours=5)),
        )
