750 lines
18 KiB
Python
750 lines
18 KiB
Python
# SPDX-License-Identifier: MIT
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"""
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End-to-end tests.
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"""
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import inspect
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import pickle
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from copy import deepcopy
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import pytest
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from hypothesis import given
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from hypothesis.strategies import booleans
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import attr
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from attr._make import NOTHING, Attribute
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from attr.exceptions import FrozenInstanceError
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@attr.s
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class C1:
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x = attr.ib(validator=attr.validators.instance_of(int))
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y = attr.ib()
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@attr.s(slots=True)
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class C1Slots:
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x = attr.ib(validator=attr.validators.instance_of(int))
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y = attr.ib()
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foo = None
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@attr.s()
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class C2:
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x = attr.ib(default=foo)
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y = attr.ib(default=attr.Factory(list))
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@attr.s(slots=True)
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class C2Slots:
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x = attr.ib(default=foo)
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y = attr.ib(default=attr.Factory(list))
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@attr.s
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class Base:
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x = attr.ib()
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def meth(self):
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return self.x
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@attr.s(slots=True)
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class BaseSlots:
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x = attr.ib()
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def meth(self):
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return self.x
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@attr.s
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class Sub(Base):
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y = attr.ib()
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@attr.s(slots=True)
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class SubSlots(BaseSlots):
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y = attr.ib()
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@attr.s(frozen=True, slots=True)
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class Frozen:
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x = attr.ib()
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@attr.s
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class SubFrozen(Frozen):
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y = attr.ib()
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@attr.s(frozen=True, slots=False)
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class FrozenNoSlots:
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x = attr.ib()
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class Meta(type):
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pass
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@attr.s
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class WithMeta(metaclass=Meta):
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pass
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@attr.s(slots=True)
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class WithMetaSlots(metaclass=Meta):
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pass
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FromMakeClass = attr.make_class("FromMakeClass", ["x"])
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class TestFunctional:
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"""
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Functional tests.
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"""
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@pytest.mark.parametrize("cls", [C2, C2Slots])
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def test_fields(self, cls):
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"""
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`attr.fields` works.
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"""
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assert (
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Attribute(
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name="x",
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alias="x",
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default=foo,
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validator=None,
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repr=True,
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cmp=None,
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eq=True,
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order=True,
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hash=None,
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init=True,
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inherited=False,
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),
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Attribute(
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name="y",
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alias="y",
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default=attr.Factory(list),
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validator=None,
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repr=True,
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cmp=None,
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eq=True,
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order=True,
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hash=None,
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init=True,
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inherited=False,
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),
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) == attr.fields(cls)
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@pytest.mark.parametrize("cls", [C1, C1Slots])
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def test_asdict(self, cls):
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"""
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`attr.asdict` works.
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"""
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assert {"x": 1, "y": 2} == attr.asdict(cls(x=1, y=2))
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@pytest.mark.parametrize("cls", [C1, C1Slots])
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def test_validator(self, cls):
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"""
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`instance_of` raises `TypeError` on type mismatch.
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"""
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with pytest.raises(TypeError) as e:
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cls("1", 2)
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# Using C1 explicitly, since slotted classes don't support this.
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assert (
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"'x' must be <class 'int'> (got '1' that is a <class 'str'>).",
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attr.fields(C1).x,
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int,
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"1",
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) == e.value.args
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@given(booleans())
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def test_renaming(self, slots):
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"""
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Private members are renamed but only in `__init__`.
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"""
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@attr.s(slots=slots)
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class C3:
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_x = attr.ib()
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assert "C3(_x=1)" == repr(C3(x=1))
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@given(booleans(), booleans())
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def test_programmatic(self, slots, frozen):
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"""
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`attr.make_class` works.
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"""
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PC = attr.make_class("PC", ["a", "b"], slots=slots, frozen=frozen)
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assert (
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Attribute(
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name="a",
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alias="a",
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default=NOTHING,
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validator=None,
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repr=True,
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cmp=None,
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eq=True,
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order=True,
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hash=None,
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init=True,
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inherited=False,
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),
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Attribute(
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name="b",
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alias="b",
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default=NOTHING,
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validator=None,
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repr=True,
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cmp=None,
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eq=True,
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order=True,
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hash=None,
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init=True,
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inherited=False,
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),
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) == attr.fields(PC)
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@pytest.mark.parametrize("cls", [Sub, SubSlots])
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def test_subclassing_with_extra_attrs(self, cls):
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"""
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Subclassing (where the subclass has extra attrs) does what you'd hope
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for.
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"""
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obj = object()
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i = cls(x=obj, y=2)
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assert i.x is i.meth() is obj
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assert i.y == 2
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if cls is Sub:
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assert f"Sub(x={obj}, y=2)" == repr(i)
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else:
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assert f"SubSlots(x={obj}, y=2)" == repr(i)
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@pytest.mark.parametrize("base", [Base, BaseSlots])
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def test_subclass_without_extra_attrs(self, base):
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"""
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Subclassing (where the subclass does not have extra attrs) still
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behaves the same as a subclass with extra attrs.
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"""
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class Sub2(base):
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pass
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obj = object()
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i = Sub2(x=obj)
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assert i.x is i.meth() is obj
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assert f"Sub2(x={obj})" == repr(i)
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@pytest.mark.parametrize(
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"frozen_class",
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[
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Frozen, # has slots=True
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attr.make_class("FrozenToo", ["x"], slots=False, frozen=True),
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],
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)
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def test_frozen_instance(self, frozen_class):
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"""
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Frozen instances can't be modified (easily).
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"""
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frozen = frozen_class(1)
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with pytest.raises(FrozenInstanceError) as e:
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frozen.x = 2
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with pytest.raises(FrozenInstanceError) as e:
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del frozen.x
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assert e.value.args[0] == "can't set attribute"
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assert 1 == frozen.x
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@pytest.mark.parametrize(
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"cls",
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[
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C1,
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C1Slots,
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C2,
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C2Slots,
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Base,
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BaseSlots,
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Sub,
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SubSlots,
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Frozen,
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FrozenNoSlots,
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FromMakeClass,
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],
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)
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@pytest.mark.parametrize("protocol", range(2, pickle.HIGHEST_PROTOCOL + 1))
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def test_pickle_attributes(self, cls, protocol):
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"""
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Pickling/un-pickling of Attribute instances works.
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"""
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for attribute in attr.fields(cls):
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assert attribute == pickle.loads(pickle.dumps(attribute, protocol))
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@pytest.mark.parametrize(
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"cls",
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[
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C1,
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C1Slots,
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C2,
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C2Slots,
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Base,
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BaseSlots,
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Sub,
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SubSlots,
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Frozen,
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FrozenNoSlots,
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FromMakeClass,
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],
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)
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@pytest.mark.parametrize("protocol", range(2, pickle.HIGHEST_PROTOCOL + 1))
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def test_pickle_object(self, cls, protocol):
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"""
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Pickle object serialization works on all kinds of attrs classes.
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"""
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if len(attr.fields(cls)) == 2:
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obj = cls(123, 456)
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else:
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obj = cls(123)
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assert repr(obj) == repr(pickle.loads(pickle.dumps(obj, protocol)))
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def test_subclassing_frozen_gives_frozen(self):
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"""
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The frozen-ness of classes is inherited. Subclasses of frozen classes
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are also frozen and can be instantiated.
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"""
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i = SubFrozen("foo", "bar")
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assert i.x == "foo"
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assert i.y == "bar"
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with pytest.raises(FrozenInstanceError):
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i.x = "baz"
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@pytest.mark.parametrize("cls", [WithMeta, WithMetaSlots])
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def test_metaclass_preserved(self, cls):
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"""
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Metaclass data is preserved.
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"""
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assert Meta == type(cls)
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def test_default_decorator(self):
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"""
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Default decorator sets the default and the respective method gets
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called.
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"""
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@attr.s
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class C:
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x = attr.ib(default=1)
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y = attr.ib()
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@y.default
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def compute(self):
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return self.x + 1
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assert C(1, 2) == C()
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@pytest.mark.parametrize("weakref_slot", [True, False])
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def test_attrib_overwrite(self, slots, frozen, weakref_slot):
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"""
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Subclasses can overwrite attributes of their base class.
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"""
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@attr.s(slots=slots, frozen=frozen, weakref_slot=weakref_slot)
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class SubOverwrite(Base):
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x = attr.ib(default=attr.Factory(list))
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assert SubOverwrite([]) == SubOverwrite()
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def test_dict_patch_class(self):
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"""
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dict-classes are never replaced.
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"""
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class C:
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x = attr.ib()
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C_new = attr.s(C)
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assert C_new is C
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def test_hash_by_id(self):
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"""
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With dict classes, hashing by ID is active for hash=False even on
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Python 3. This is incorrect behavior but we have to retain it for
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backward compatibility.
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"""
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@attr.s(hash=False)
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class HashByIDBackwardCompat:
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x = attr.ib()
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assert hash(HashByIDBackwardCompat(1)) != hash(
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HashByIDBackwardCompat(1)
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)
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@attr.s(hash=False, eq=False)
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class HashByID:
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x = attr.ib()
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assert hash(HashByID(1)) != hash(HashByID(1))
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@attr.s(hash=True)
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class HashByValues:
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x = attr.ib()
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assert hash(HashByValues(1)) == hash(HashByValues(1))
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def test_handles_different_defaults(self):
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"""
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Unhashable defaults + subclassing values work.
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"""
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@attr.s
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class Unhashable:
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pass
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@attr.s
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class C:
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x = attr.ib(default=Unhashable())
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@attr.s
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class D(C):
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pass
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def test_hash_false_eq_false(self, slots):
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"""
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hash=False and eq=False make a class hashable by ID.
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"""
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@attr.s(hash=False, eq=False, slots=slots)
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class C:
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pass
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assert hash(C()) != hash(C())
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def test_eq_false(self, slots):
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"""
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eq=False makes a class hashable by ID.
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"""
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@attr.s(eq=False, slots=slots)
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class C:
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pass
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# Ensure both objects live long enough such that their ids/hashes
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# can't be recycled. Thanks to Ask Hjorth Larsen for pointing that
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# out.
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c1 = C()
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c2 = C()
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assert hash(c1) != hash(c2)
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def test_overwrite_base(self):
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"""
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Base classes can overwrite each other and the attributes are added
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in the order they are defined.
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"""
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@attr.s
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class C:
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c = attr.ib(default=100)
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x = attr.ib(default=1)
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b = attr.ib(default=23)
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@attr.s
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class D(C):
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a = attr.ib(default=42)
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x = attr.ib(default=2)
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d = attr.ib(default=3.14)
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@attr.s
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class E(D):
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y = attr.ib(default=3)
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z = attr.ib(default=4)
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assert "E(c=100, b=23, a=42, x=2, d=3.14, y=3, z=4)" == repr(E())
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@pytest.mark.parametrize("base_slots", [True, False])
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@pytest.mark.parametrize("sub_slots", [True, False])
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@pytest.mark.parametrize("base_frozen", [True, False])
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@pytest.mark.parametrize("sub_frozen", [True, False])
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@pytest.mark.parametrize("base_weakref_slot", [True, False])
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@pytest.mark.parametrize("sub_weakref_slot", [True, False])
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@pytest.mark.parametrize("base_converter", [True, False])
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@pytest.mark.parametrize("sub_converter", [True, False])
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def test_frozen_slots_combo(
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self,
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base_slots,
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sub_slots,
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base_frozen,
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sub_frozen,
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base_weakref_slot,
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sub_weakref_slot,
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base_converter,
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sub_converter,
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):
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"""
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A class with a single attribute, inheriting from another class
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with a single attribute.
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"""
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@attr.s(
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frozen=base_frozen,
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slots=base_slots,
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weakref_slot=base_weakref_slot,
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)
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class Base:
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a = attr.ib(converter=int if base_converter else None)
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@attr.s(
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frozen=sub_frozen, slots=sub_slots, weakref_slot=sub_weakref_slot
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)
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class Sub(Base):
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b = attr.ib(converter=int if sub_converter else None)
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i = Sub("1", "2")
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assert i.a == (1 if base_converter else "1")
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assert i.b == (2 if sub_converter else "2")
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if base_frozen or sub_frozen:
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with pytest.raises(FrozenInstanceError):
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i.a = "2"
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with pytest.raises(FrozenInstanceError):
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i.b = "3"
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def test_tuple_class_aliasing(self):
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"""
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itemgetter and property are legal attribute names.
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"""
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@attr.s
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class C:
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property = attr.ib()
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itemgetter = attr.ib()
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x = attr.ib()
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assert "property" == attr.fields(C).property.name
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assert "itemgetter" == attr.fields(C).itemgetter.name
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assert "x" == attr.fields(C).x.name
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def test_auto_exc(self, slots, frozen):
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"""
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Classes with auto_exc=True have a Exception-style __str__, compare and
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hash by id, and store the fields additionally in self.args.
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"""
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@attr.s(auto_exc=True, slots=slots, frozen=frozen)
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class FooError(Exception):
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x = attr.ib()
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y = attr.ib(init=False, default=42)
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z = attr.ib(init=False)
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a = attr.ib()
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FooErrorMade = attr.make_class(
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"FooErrorMade",
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bases=(Exception,),
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attrs={
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"x": attr.ib(),
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"y": attr.ib(init=False, default=42),
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"z": attr.ib(init=False),
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"a": attr.ib(),
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},
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auto_exc=True,
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slots=slots,
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frozen=frozen,
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)
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assert FooError(1, "foo") != FooError(1, "foo")
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assert FooErrorMade(1, "foo") != FooErrorMade(1, "foo")
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for cls in (FooError, FooErrorMade):
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with pytest.raises(cls) as ei1:
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raise cls(1, "foo")
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with pytest.raises(cls) as ei2:
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raise cls(1, "foo")
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e1 = ei1.value
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e2 = ei2.value
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assert e1 is e1
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assert e1 == e1
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assert e2 == e2
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assert e1 != e2
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assert "(1, 'foo')" == str(e1) == str(e2)
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assert (1, "foo") == e1.args == e2.args
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hash(e1) == hash(e1)
|
|
hash(e2) == hash(e2)
|
|
|
|
if not frozen:
|
|
deepcopy(e1)
|
|
deepcopy(e2)
|
|
|
|
def test_auto_exc_one_attrib(self, slots, frozen):
|
|
"""
|
|
Having one attribute works with auto_exc=True.
|
|
|
|
Easy to get wrong with tuple literals.
|
|
"""
|
|
|
|
@attr.s(auto_exc=True, slots=slots, frozen=frozen)
|
|
class FooError(Exception):
|
|
x = attr.ib()
|
|
|
|
FooError(1)
|
|
|
|
def test_eq_only(self, slots, frozen):
|
|
"""
|
|
Classes with order=False cannot be ordered.
|
|
"""
|
|
|
|
@attr.s(eq=True, order=False, slots=slots, frozen=frozen)
|
|
class C:
|
|
x = attr.ib()
|
|
|
|
possible_errors = (
|
|
"unorderable types: C() < C()",
|
|
"'<' not supported between instances of 'C' and 'C'",
|
|
"unorderable types: C < C", # old PyPy 3
|
|
)
|
|
|
|
with pytest.raises(TypeError) as ei:
|
|
C(5) < C(6)
|
|
|
|
assert ei.value.args[0] in possible_errors
|
|
|
|
@pytest.mark.parametrize("cmp", [True, False])
|
|
def test_attrib_cmp_shortcut(self, slots, cmp):
|
|
"""
|
|
Setting cmp on `attr.ib`s sets both eq and order.
|
|
"""
|
|
|
|
@attr.s(slots=slots)
|
|
class C:
|
|
x = attr.ib(cmp=cmp)
|
|
|
|
assert cmp is attr.fields(C).x.eq
|
|
assert cmp is attr.fields(C).x.order
|
|
|
|
def test_no_setattr_if_validate_without_validators(self, slots):
|
|
"""
|
|
If a class has on_setattr=attr.setters.validate (former default in NG
|
|
APIs) but sets no validators, don't use the (slower) setattr in
|
|
__init__.
|
|
|
|
Regression test for #816.
|
|
"""
|
|
|
|
@attr.s(on_setattr=attr.setters.validate, slots=slots)
|
|
class C:
|
|
x = attr.ib()
|
|
|
|
@attr.s(on_setattr=attr.setters.validate, slots=slots)
|
|
class D(C):
|
|
y = attr.ib()
|
|
|
|
src = inspect.getsource(D.__init__)
|
|
|
|
assert "setattr" not in src
|
|
assert "self.x = x" in src
|
|
assert "self.y = y" in src
|
|
assert object.__setattr__ == D.__setattr__
|
|
|
|
def test_no_setattr_if_convert_without_converters(self, slots):
|
|
"""
|
|
If a class has on_setattr=attr.setters.convert but sets no validators,
|
|
don't use the (slower) setattr in __init__.
|
|
"""
|
|
|
|
@attr.s(on_setattr=attr.setters.convert, slots=slots)
|
|
class C:
|
|
x = attr.ib()
|
|
|
|
@attr.s(on_setattr=attr.setters.convert, slots=slots)
|
|
class D(C):
|
|
y = attr.ib()
|
|
|
|
src = inspect.getsource(D.__init__)
|
|
|
|
assert "setattr" not in src
|
|
assert "self.x = x" in src
|
|
assert "self.y = y" in src
|
|
assert object.__setattr__ == D.__setattr__
|
|
|
|
def test_no_setattr_with_ng_defaults(self, slots):
|
|
"""
|
|
If a class has the NG default on_setattr=[convert, validate] but sets
|
|
no validators or converters, don't use the (slower) setattr in
|
|
__init__.
|
|
"""
|
|
|
|
@attr.define(slots=slots)
|
|
class C:
|
|
x = attr.ib()
|
|
|
|
src = inspect.getsource(C.__init__)
|
|
|
|
assert "setattr" not in src
|
|
assert "self.x = x" in src
|
|
assert object.__setattr__ == C.__setattr__
|
|
|
|
@attr.define(slots=slots)
|
|
class D(C):
|
|
y = attr.ib()
|
|
|
|
src = inspect.getsource(D.__init__)
|
|
|
|
assert "setattr" not in src
|
|
assert "self.x = x" in src
|
|
assert "self.y = y" in src
|
|
assert object.__setattr__ == D.__setattr__
|
|
|
|
def test_on_setattr_detect_inherited_validators(self):
|
|
"""
|
|
_make_init detects the presence of a validator even if the field is
|
|
inherited.
|
|
"""
|
|
|
|
@attr.s(on_setattr=attr.setters.validate)
|
|
class C:
|
|
x = attr.ib(validator=42)
|
|
|
|
@attr.s(on_setattr=attr.setters.validate)
|
|
class D(C):
|
|
y = attr.ib()
|
|
|
|
src = inspect.getsource(D.__init__)
|
|
|
|
assert "_setattr = _cached_setattr_get(self)" in src
|
|
assert "_setattr('x', x)" in src
|
|
assert "_setattr('y', y)" in src
|
|
assert object.__setattr__ != D.__setattr__
|
|
|
|
def test_unsafe_hash(self, slots):
|
|
"""
|
|
attr.s(unsafe_hash=True) makes a class hashable.
|
|
"""
|
|
|
|
@attr.s(slots=slots, unsafe_hash=True)
|
|
class Hashable:
|
|
pass
|
|
|
|
assert hash(Hashable())
|