862 lines
23 KiB
Python
862 lines
23 KiB
Python
"""
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Tests for dunder methods from `attrib._make`.
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"""
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from __future__ import absolute_import, division, print_function
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import copy
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import pickle
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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 (
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NOTHING,
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Factory,
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_add_repr,
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_is_slot_cls,
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_make_init,
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_Nothing,
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fields,
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make_class,
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)
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from attr.validators import instance_of
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from .utils import simple_attr, simple_class
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EqC = simple_class(eq=True)
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EqCSlots = simple_class(eq=True, slots=True)
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OrderC = simple_class(order=True)
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OrderCSlots = simple_class(order=True, slots=True)
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ReprC = simple_class(repr=True)
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ReprCSlots = simple_class(repr=True, slots=True)
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# HashC is hashable by explicit definition while HashCSlots is hashable
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# implicitly. The "Cached" versions are the same, except with hash code
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# caching enabled
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HashC = simple_class(hash=True)
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HashCSlots = simple_class(hash=None, eq=True, frozen=True, slots=True)
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HashCCached = simple_class(hash=True, cache_hash=True)
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HashCSlotsCached = simple_class(
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hash=None, eq=True, frozen=True, slots=True, cache_hash=True
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)
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# the cached hash code is stored slightly differently in this case
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# so it needs to be tested separately
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HashCFrozenNotSlotsCached = simple_class(
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frozen=True, slots=False, hash=True, cache_hash=True
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)
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def _add_init(cls, frozen):
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"""
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Add a __init__ method to *cls*. If *frozen* is True, make it immutable.
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This function used to be part of _make. It wasn't used anymore however
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the tests for it are still useful to test the behavior of _make_init.
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"""
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cls.__init__ = _make_init(
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cls,
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cls.__attrs_attrs__,
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getattr(cls, "__attrs_post_init__", False),
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frozen,
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_is_slot_cls(cls),
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cache_hash=False,
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base_attr_map={},
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is_exc=False,
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has_global_on_setattr=False,
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)
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return cls
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class InitC(object):
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__attrs_attrs__ = [simple_attr("a"), simple_attr("b")]
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InitC = _add_init(InitC, False)
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class TestEqOrder(object):
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"""
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Tests for eq and order related methods.
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"""
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@given(booleans())
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def test_eq_ignore_attrib(self, slots):
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"""
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If `eq` is False for an attribute, ignore that attribute.
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"""
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C = make_class(
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"C", {"a": attr.ib(eq=False), "b": attr.ib()}, slots=slots
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)
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assert C(1, 2) == C(2, 2)
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@pytest.mark.parametrize("cls", [EqC, EqCSlots])
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def test_equal(self, cls):
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"""
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Equal objects are detected as equal.
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"""
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assert cls(1, 2) == cls(1, 2)
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assert not (cls(1, 2) != cls(1, 2))
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@pytest.mark.parametrize("cls", [EqC, EqCSlots])
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def test_unequal_same_class(self, cls):
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"""
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Unequal objects of correct type are detected as unequal.
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"""
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assert cls(1, 2) != cls(2, 1)
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assert not (cls(1, 2) == cls(2, 1))
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@pytest.mark.parametrize("cls", [EqC, EqCSlots])
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def test_unequal_different_class(self, cls):
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"""
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Unequal objects of different type are detected even if their attributes
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match.
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"""
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class NotEqC(object):
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a = 1
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b = 2
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assert cls(1, 2) != NotEqC()
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assert not (cls(1, 2) == NotEqC())
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@pytest.mark.parametrize("cls", [OrderC, OrderCSlots])
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def test_lt(self, cls):
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"""
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__lt__ compares objects as tuples of attribute values.
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"""
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for a, b in [
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((1, 2), (2, 1)),
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((1, 2), (1, 3)),
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(("a", "b"), ("b", "a")),
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]:
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assert cls(*a) < cls(*b)
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@pytest.mark.parametrize("cls", [OrderC, OrderCSlots])
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def test_lt_unordable(self, cls):
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"""
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__lt__ returns NotImplemented if classes differ.
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"""
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assert NotImplemented == (cls(1, 2).__lt__(42))
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@pytest.mark.parametrize("cls", [OrderC, OrderCSlots])
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def test_le(self, cls):
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"""
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__le__ compares objects as tuples of attribute values.
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"""
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for a, b in [
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((1, 2), (2, 1)),
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((1, 2), (1, 3)),
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((1, 1), (1, 1)),
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(("a", "b"), ("b", "a")),
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(("a", "b"), ("a", "b")),
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]:
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assert cls(*a) <= cls(*b)
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@pytest.mark.parametrize("cls", [OrderC, OrderCSlots])
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def test_le_unordable(self, cls):
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"""
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__le__ returns NotImplemented if classes differ.
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"""
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assert NotImplemented == (cls(1, 2).__le__(42))
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@pytest.mark.parametrize("cls", [OrderC, OrderCSlots])
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def test_gt(self, cls):
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"""
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__gt__ compares objects as tuples of attribute values.
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"""
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for a, b in [
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((2, 1), (1, 2)),
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((1, 3), (1, 2)),
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(("b", "a"), ("a", "b")),
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]:
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assert cls(*a) > cls(*b)
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@pytest.mark.parametrize("cls", [OrderC, OrderCSlots])
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def test_gt_unordable(self, cls):
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"""
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__gt__ returns NotImplemented if classes differ.
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"""
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assert NotImplemented == (cls(1, 2).__gt__(42))
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@pytest.mark.parametrize("cls", [OrderC, OrderCSlots])
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def test_ge(self, cls):
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"""
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__ge__ compares objects as tuples of attribute values.
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"""
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for a, b in [
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((2, 1), (1, 2)),
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((1, 3), (1, 2)),
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((1, 1), (1, 1)),
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(("b", "a"), ("a", "b")),
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(("a", "b"), ("a", "b")),
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]:
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assert cls(*a) >= cls(*b)
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@pytest.mark.parametrize("cls", [OrderC, OrderCSlots])
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def test_ge_unordable(self, cls):
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"""
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__ge__ returns NotImplemented if classes differ.
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"""
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assert NotImplemented == (cls(1, 2).__ge__(42))
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class TestAddRepr(object):
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"""
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Tests for `_add_repr`.
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"""
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@pytest.mark.parametrize("slots", [True, False])
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def test_repr(self, slots):
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"""
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If `repr` is False, ignore that attribute.
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"""
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C = make_class(
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"C", {"a": attr.ib(repr=False), "b": attr.ib()}, slots=slots
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)
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assert "C(b=2)" == repr(C(1, 2))
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@pytest.mark.parametrize("cls", [ReprC, ReprCSlots])
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def test_repr_works(self, cls):
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"""
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repr returns a sensible value.
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"""
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assert "C(a=1, b=2)" == repr(cls(1, 2))
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def test_custom_repr_works(self):
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"""
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repr returns a sensible value for attributes with a custom repr
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callable.
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"""
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def custom_repr(value):
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return "foo:" + str(value)
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@attr.s
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class C(object):
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a = attr.ib(repr=custom_repr)
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assert "C(a=foo:1)" == repr(C(1))
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def test_infinite_recursion(self):
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"""
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In the presence of a cyclic graph, repr will emit an ellipsis and not
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raise an exception.
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"""
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@attr.s
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class Cycle(object):
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value = attr.ib(default=7)
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cycle = attr.ib(default=None)
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cycle = Cycle()
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cycle.cycle = cycle
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assert "Cycle(value=7, cycle=...)" == repr(cycle)
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def test_underscores(self):
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"""
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repr does not strip underscores.
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"""
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class C(object):
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__attrs_attrs__ = [simple_attr("_x")]
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C = _add_repr(C)
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i = C()
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i._x = 42
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assert "C(_x=42)" == repr(i)
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def test_repr_uninitialized_member(self):
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"""
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repr signals unset attributes
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"""
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C = make_class("C", {"a": attr.ib(init=False)})
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assert "C(a=NOTHING)" == repr(C())
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@given(add_str=booleans(), slots=booleans())
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def test_str(self, add_str, slots):
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"""
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If str is True, it returns the same as repr.
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This only makes sense when subclassing a class with an poor __str__
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(like Exceptions).
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"""
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@attr.s(str=add_str, slots=slots)
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class Error(Exception):
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x = attr.ib()
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e = Error(42)
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assert (str(e) == repr(e)) is add_str
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def test_str_no_repr(self):
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"""
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Raises a ValueError if repr=False and str=True.
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"""
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with pytest.raises(ValueError) as e:
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simple_class(repr=False, str=True)
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assert (
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"__str__ can only be generated if a __repr__ exists."
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) == e.value.args[0]
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# these are for use in TestAddHash.test_cache_hash_serialization
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# they need to be out here so they can be un-pickled
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@attr.attrs(hash=True, cache_hash=False)
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class HashCacheSerializationTestUncached(object):
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foo_value = attr.ib()
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@attr.attrs(hash=True, cache_hash=True)
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class HashCacheSerializationTestCached(object):
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foo_value = attr.ib()
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@attr.attrs(slots=True, hash=True, cache_hash=True)
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class HashCacheSerializationTestCachedSlots(object):
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foo_value = attr.ib()
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class IncrementingHasher(object):
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def __init__(self):
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self.hash_value = 100
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def __hash__(self):
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rv = self.hash_value
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self.hash_value += 1
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return rv
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class TestAddHash(object):
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"""
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Tests for `_add_hash`.
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"""
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def test_enforces_type(self):
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"""
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The `hash` argument to both attrs and attrib must be None, True, or
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False.
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"""
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exc_args = ("Invalid value for hash. Must be True, False, or None.",)
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with pytest.raises(TypeError) as e:
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make_class("C", {}, hash=1),
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assert exc_args == e.value.args
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with pytest.raises(TypeError) as e:
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make_class("C", {"a": attr.ib(hash=1)}),
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assert exc_args == e.value.args
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def test_enforce_no_cache_hash_without_hash(self):
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"""
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Ensure exception is thrown if caching the hash code is requested
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but attrs is not requested to generate `__hash__`.
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"""
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exc_args = (
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"Invalid value for cache_hash. To use hash caching,"
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" hashing must be either explicitly or implicitly "
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"enabled.",
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)
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with pytest.raises(TypeError) as e:
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make_class("C", {}, hash=False, cache_hash=True)
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assert exc_args == e.value.args
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# unhashable case
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with pytest.raises(TypeError) as e:
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make_class(
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"C", {}, hash=None, eq=True, frozen=False, cache_hash=True
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)
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assert exc_args == e.value.args
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def test_enforce_no_cached_hash_without_init(self):
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"""
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Ensure exception is thrown if caching the hash code is requested
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but attrs is not requested to generate `__init__`.
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"""
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exc_args = (
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"Invalid value for cache_hash. To use hash caching,"
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" init must be True.",
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)
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with pytest.raises(TypeError) as e:
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make_class("C", {}, init=False, hash=True, cache_hash=True)
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assert exc_args == e.value.args
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@given(booleans(), booleans())
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def test_hash_attribute(self, slots, cache_hash):
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"""
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If `hash` is False on an attribute, ignore that attribute.
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"""
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C = make_class(
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"C",
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{"a": attr.ib(hash=False), "b": attr.ib()},
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slots=slots,
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hash=True,
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cache_hash=cache_hash,
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)
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assert hash(C(1, 2)) == hash(C(2, 2))
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@given(booleans())
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def test_hash_attribute_mirrors_eq(self, eq):
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"""
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If `hash` is None, the hash generation mirrors `eq`.
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"""
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C = make_class("C", {"a": attr.ib(eq=eq)}, eq=True, frozen=True)
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if eq:
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assert C(1) != C(2)
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assert hash(C(1)) != hash(C(2))
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assert hash(C(1)) == hash(C(1))
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else:
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assert C(1) == C(2)
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assert hash(C(1)) == hash(C(2))
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@given(booleans())
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def test_hash_mirrors_eq(self, eq):
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"""
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If `hash` is None, the hash generation mirrors `eq`.
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"""
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C = make_class("C", {"a": attr.ib()}, eq=eq, frozen=True)
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i = C(1)
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assert i == i
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assert hash(i) == hash(i)
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if eq:
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assert C(1) == C(1)
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assert hash(C(1)) == hash(C(1))
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else:
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assert C(1) != C(1)
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assert hash(C(1)) != hash(C(1))
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@pytest.mark.parametrize(
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"cls",
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[
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HashC,
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HashCSlots,
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HashCCached,
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HashCSlotsCached,
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HashCFrozenNotSlotsCached,
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],
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)
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def test_hash_works(self, cls):
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"""
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__hash__ returns different hashes for different values.
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"""
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a = cls(1, 2)
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b = cls(1, 1)
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assert hash(a) != hash(b)
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# perform the test again to test the pre-cached path through
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# __hash__ for the cached-hash versions
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assert hash(a) != hash(b)
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def test_hash_default(self):
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"""
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Classes are not hashable by default.
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"""
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C = make_class("C", {})
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with pytest.raises(TypeError) as e:
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hash(C())
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assert e.value.args[0] in (
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"'C' objects are unhashable", # PyPy
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"unhashable type: 'C'", # CPython
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)
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def test_cache_hashing(self):
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"""
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Ensure that hash computation if cached if and only if requested
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"""
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class HashCounter:
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"""
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A class for testing which counts how many times its hash
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has been requested
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"""
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def __init__(self):
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self.times_hash_called = 0
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def __hash__(self):
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self.times_hash_called += 1
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return 12345
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Uncached = make_class(
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"Uncached",
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{"hash_counter": attr.ib(factory=HashCounter)},
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hash=True,
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cache_hash=False,
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)
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Cached = make_class(
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"Cached",
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{"hash_counter": attr.ib(factory=HashCounter)},
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hash=True,
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cache_hash=True,
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)
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uncached_instance = Uncached()
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cached_instance = Cached()
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hash(uncached_instance)
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hash(uncached_instance)
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hash(cached_instance)
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hash(cached_instance)
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assert 2 == uncached_instance.hash_counter.times_hash_called
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assert 1 == cached_instance.hash_counter.times_hash_called
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@pytest.mark.parametrize("cache_hash", [True, False])
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@pytest.mark.parametrize("frozen", [True, False])
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@pytest.mark.parametrize("slots", [True, False])
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def test_copy_hash_cleared(self, cache_hash, frozen, slots):
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"""
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Test that the default hash is recalculated after a copy operation.
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"""
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kwargs = dict(frozen=frozen, slots=slots, cache_hash=cache_hash)
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# Give it an explicit hash if we don't have an implicit one
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if not frozen:
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kwargs["hash"] = True
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@attr.s(**kwargs)
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class C(object):
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x = attr.ib()
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a = C(IncrementingHasher())
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# Ensure that any hash cache would be calculated before copy
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orig_hash = hash(a)
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b = copy.deepcopy(a)
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if kwargs["cache_hash"]:
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# For cache_hash classes, this call is cached
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assert orig_hash == hash(a)
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|
assert orig_hash != hash(b)
|
|
|
|
@pytest.mark.parametrize(
|
|
"klass,cached",
|
|
[
|
|
(HashCacheSerializationTestUncached, False),
|
|
(HashCacheSerializationTestCached, True),
|
|
(HashCacheSerializationTestCachedSlots, True),
|
|
],
|
|
)
|
|
def test_cache_hash_serialization_hash_cleared(self, klass, cached):
|
|
"""
|
|
Tests that the hash cache is cleared on deserialization to fix
|
|
https://github.com/python-attrs/attrs/issues/482 .
|
|
|
|
This test is intended to guard against a stale hash code surviving
|
|
across serialization (which may cause problems when the hash value
|
|
is different in different interpreters).
|
|
"""
|
|
|
|
obj = klass(IncrementingHasher())
|
|
original_hash = hash(obj)
|
|
obj_rt = self._roundtrip_pickle(obj)
|
|
|
|
if cached:
|
|
assert original_hash == hash(obj)
|
|
|
|
assert original_hash != hash(obj_rt)
|
|
|
|
@pytest.mark.parametrize("frozen", [True, False])
|
|
def test_copy_two_arg_reduce(self, frozen):
|
|
"""
|
|
If __getstate__ returns None, the tuple returned by object.__reduce__
|
|
won't contain the state dictionary; this test ensures that the custom
|
|
__reduce__ generated when cache_hash=True works in that case.
|
|
"""
|
|
|
|
@attr.s(frozen=frozen, cache_hash=True, hash=True)
|
|
class C(object):
|
|
x = attr.ib()
|
|
|
|
def __getstate__(self):
|
|
return None
|
|
|
|
# By the nature of this test it doesn't really create an object that's
|
|
# in a valid state - it basically does the equivalent of
|
|
# `object.__new__(C)`, so it doesn't make much sense to assert anything
|
|
# about the result of the copy. This test will just check that it
|
|
# doesn't raise an *error*.
|
|
copy.deepcopy(C(1))
|
|
|
|
def _roundtrip_pickle(self, obj):
|
|
pickle_str = pickle.dumps(obj)
|
|
return pickle.loads(pickle_str)
|
|
|
|
|
|
class TestAddInit(object):
|
|
"""
|
|
Tests for `_add_init`.
|
|
"""
|
|
|
|
@given(booleans(), booleans())
|
|
def test_init(self, slots, frozen):
|
|
"""
|
|
If `init` is False, ignore that attribute.
|
|
"""
|
|
C = make_class(
|
|
"C",
|
|
{"a": attr.ib(init=False), "b": attr.ib()},
|
|
slots=slots,
|
|
frozen=frozen,
|
|
)
|
|
with pytest.raises(TypeError) as e:
|
|
C(a=1, b=2)
|
|
|
|
assert (
|
|
"__init__() got an unexpected keyword argument 'a'"
|
|
== e.value.args[0]
|
|
)
|
|
|
|
@given(booleans(), booleans())
|
|
def test_no_init_default(self, slots, frozen):
|
|
"""
|
|
If `init` is False but a Factory is specified, don't allow passing that
|
|
argument but initialize it anyway.
|
|
"""
|
|
C = make_class(
|
|
"C",
|
|
{
|
|
"_a": attr.ib(init=False, default=42),
|
|
"_b": attr.ib(init=False, default=Factory(list)),
|
|
"c": attr.ib(),
|
|
},
|
|
slots=slots,
|
|
frozen=frozen,
|
|
)
|
|
with pytest.raises(TypeError):
|
|
C(a=1, c=2)
|
|
with pytest.raises(TypeError):
|
|
C(b=1, c=2)
|
|
|
|
i = C(23)
|
|
assert (42, [], 23) == (i._a, i._b, i.c)
|
|
|
|
@given(booleans(), booleans())
|
|
def test_no_init_order(self, slots, frozen):
|
|
"""
|
|
If an attribute is `init=False`, it's legal to come after a mandatory
|
|
attribute.
|
|
"""
|
|
make_class(
|
|
"C",
|
|
{"a": attr.ib(default=Factory(list)), "b": attr.ib(init=False)},
|
|
slots=slots,
|
|
frozen=frozen,
|
|
)
|
|
|
|
def test_sets_attributes(self):
|
|
"""
|
|
The attributes are initialized using the passed keywords.
|
|
"""
|
|
obj = InitC(a=1, b=2)
|
|
assert 1 == obj.a
|
|
assert 2 == obj.b
|
|
|
|
def test_default(self):
|
|
"""
|
|
If a default value is present, it's used as fallback.
|
|
"""
|
|
|
|
class C(object):
|
|
__attrs_attrs__ = [
|
|
simple_attr(name="a", default=2),
|
|
simple_attr(name="b", default="hallo"),
|
|
simple_attr(name="c", default=None),
|
|
]
|
|
|
|
C = _add_init(C, False)
|
|
i = C()
|
|
assert 2 == i.a
|
|
assert "hallo" == i.b
|
|
assert None is i.c
|
|
|
|
def test_factory(self):
|
|
"""
|
|
If a default factory is present, it's used as fallback.
|
|
"""
|
|
|
|
class D(object):
|
|
pass
|
|
|
|
class C(object):
|
|
__attrs_attrs__ = [
|
|
simple_attr(name="a", default=Factory(list)),
|
|
simple_attr(name="b", default=Factory(D)),
|
|
]
|
|
|
|
C = _add_init(C, False)
|
|
i = C()
|
|
|
|
assert [] == i.a
|
|
assert isinstance(i.b, D)
|
|
|
|
def test_validator(self):
|
|
"""
|
|
If a validator is passed, call it with the preliminary instance, the
|
|
Attribute, and the argument.
|
|
"""
|
|
|
|
class VException(Exception):
|
|
pass
|
|
|
|
def raiser(*args):
|
|
raise VException(*args)
|
|
|
|
C = make_class("C", {"a": attr.ib("a", validator=raiser)})
|
|
with pytest.raises(VException) as e:
|
|
C(42)
|
|
|
|
assert (fields(C).a, 42) == e.value.args[1:]
|
|
assert isinstance(e.value.args[0], C)
|
|
|
|
def test_validator_slots(self):
|
|
"""
|
|
If a validator is passed, call it with the preliminary instance, the
|
|
Attribute, and the argument.
|
|
"""
|
|
|
|
class VException(Exception):
|
|
pass
|
|
|
|
def raiser(*args):
|
|
raise VException(*args)
|
|
|
|
C = make_class("C", {"a": attr.ib("a", validator=raiser)}, slots=True)
|
|
with pytest.raises(VException) as e:
|
|
C(42)
|
|
|
|
assert (fields(C)[0], 42) == e.value.args[1:]
|
|
assert isinstance(e.value.args[0], C)
|
|
|
|
@given(booleans())
|
|
def test_validator_others(self, slots):
|
|
"""
|
|
Does not interfere when setting non-attrs attributes.
|
|
"""
|
|
C = make_class(
|
|
"C", {"a": attr.ib("a", validator=instance_of(int))}, slots=slots
|
|
)
|
|
i = C(1)
|
|
|
|
assert 1 == i.a
|
|
|
|
if not slots:
|
|
i.b = "foo"
|
|
assert "foo" == i.b
|
|
else:
|
|
with pytest.raises(AttributeError):
|
|
i.b = "foo"
|
|
|
|
def test_underscores(self):
|
|
"""
|
|
The argument names in `__init__` are without leading and trailing
|
|
underscores.
|
|
"""
|
|
|
|
class C(object):
|
|
__attrs_attrs__ = [simple_attr("_private")]
|
|
|
|
C = _add_init(C, False)
|
|
i = C(private=42)
|
|
assert 42 == i._private
|
|
|
|
|
|
class TestNothing(object):
|
|
"""
|
|
Tests for `_Nothing`.
|
|
"""
|
|
|
|
def test_copy(self):
|
|
"""
|
|
__copy__ returns the same object.
|
|
"""
|
|
n = _Nothing()
|
|
assert n is copy.copy(n)
|
|
|
|
def test_deepcopy(self):
|
|
"""
|
|
__deepcopy__ returns the same object.
|
|
"""
|
|
n = _Nothing()
|
|
assert n is copy.deepcopy(n)
|
|
|
|
def test_eq(self):
|
|
"""
|
|
All instances are equal.
|
|
"""
|
|
assert _Nothing() == _Nothing() == NOTHING
|
|
assert not (_Nothing() != _Nothing())
|
|
assert 1 != _Nothing()
|
|
|
|
def test_false(self):
|
|
"""
|
|
NOTHING evaluates as falsey.
|
|
"""
|
|
assert not NOTHING
|
|
assert False is bool(NOTHING)
|
|
|
|
|
|
@attr.s(hash=True, order=True)
|
|
class C(object):
|
|
pass
|
|
|
|
|
|
# Store this class so that we recreate it.
|
|
OriginalC = C
|
|
|
|
|
|
@attr.s(hash=True, order=True)
|
|
class C(object):
|
|
pass
|
|
|
|
|
|
class TestFilenames(object):
|
|
def test_filenames(self):
|
|
"""
|
|
The created dunder methods have a "consistent" filename.
|
|
"""
|
|
assert (
|
|
OriginalC.__init__.__code__.co_filename
|
|
== "<attrs generated init tests.test_dunders.C>"
|
|
)
|
|
assert (
|
|
OriginalC.__eq__.__code__.co_filename
|
|
== "<attrs generated eq tests.test_dunders.C>"
|
|
)
|
|
assert (
|
|
OriginalC.__hash__.__code__.co_filename
|
|
== "<attrs generated hash tests.test_dunders.C>"
|
|
)
|
|
assert (
|
|
C.__init__.__code__.co_filename
|
|
== "<attrs generated init tests.test_dunders.C-2>"
|
|
)
|
|
assert (
|
|
C.__eq__.__code__.co_filename
|
|
== "<attrs generated eq tests.test_dunders.C-2>"
|
|
)
|
|
assert (
|
|
C.__hash__.__code__.co_filename
|
|
== "<attrs generated hash tests.test_dunders.C-2>"
|
|
)
|