/
test_make.py
2427 lines (1893 loc) · 62.1 KB
/
test_make.py
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# SPDX-License-Identifier: MIT
"""
Tests for `attr._make`.
"""
import copy
import functools
import gc
import inspect
import itertools
import sys
from operator import attrgetter
import pytest
from hypothesis import assume, given
from hypothesis.strategies import booleans, integers, lists, sampled_from, text
import attr
from attr import _config
from attr._compat import PY310
from attr._make import (
Attribute,
Factory,
_AndValidator,
_Attributes,
_ClassBuilder,
_CountingAttr,
_determine_attrib_eq_order,
_determine_attrs_eq_order,
_determine_whether_to_implement,
_transform_attrs,
and_,
fields,
fields_dict,
make_class,
validate,
)
from attr.exceptions import DefaultAlreadySetError, NotAnAttrsClassError
from .strategies import (
gen_attr_names,
list_of_attrs,
optional_bool,
simple_attrs,
simple_attrs_with_metadata,
simple_attrs_without_metadata,
simple_classes,
)
from .utils import simple_attr
attrs_st = simple_attrs.map(lambda c: Attribute.from_counting_attr("name", c))
class TestCountingAttr:
"""
Tests for `attr`.
"""
def test_returns_Attr(self):
"""
Returns an instance of _CountingAttr.
"""
a = attr.ib()
assert isinstance(a, _CountingAttr)
def test_validators_lists_to_wrapped_tuples(self):
"""
If a list is passed as validator, it's just converted to a tuple.
"""
def v1(_, __):
pass
def v2(_, __):
pass
a = attr.ib(validator=[v1, v2])
assert _AndValidator((v1, v2)) == a._validator
def test_validator_decorator_single(self):
"""
If _CountingAttr.validator is used as a decorator and there is no
decorator set, the decorated method is used as the validator.
"""
a = attr.ib()
@a.validator
def v():
pass
assert v == a._validator
@pytest.mark.parametrize(
"wrap", [lambda v: v, lambda v: [v], lambda v: and_(v)]
)
def test_validator_decorator(self, wrap):
"""
If _CountingAttr.validator is used as a decorator and there is already
a decorator set, the decorators are composed using `and_`.
"""
def v(_, __):
pass
a = attr.ib(validator=wrap(v))
@a.validator
def v2(self, _, __):
pass
assert _AndValidator((v, v2)) == a._validator
def test_default_decorator_already_set(self):
"""
Raise DefaultAlreadySetError if the decorator is used after a default
has been set.
"""
a = attr.ib(default=42)
with pytest.raises(DefaultAlreadySetError):
@a.default
def f(self):
pass
def test_default_decorator_sets(self):
"""
Decorator wraps the method in a Factory with pass_self=True and sets
the default.
"""
a = attr.ib()
@a.default
def f(self):
pass
assert Factory(f, True) == a._default
def make_tc():
class TransformC:
z = attr.ib()
y = attr.ib()
x = attr.ib()
a = 42
return TransformC
class TestTransformAttrs:
"""
Tests for `_transform_attrs`.
"""
def test_no_modifications(self):
"""
Does not attach __attrs_attrs__ to the class.
"""
C = make_tc()
_transform_attrs(C, None, False, False, True, None)
assert None is getattr(C, "__attrs_attrs__", None)
def test_normal(self):
"""
Transforms every `_CountingAttr` and leaves others (a) be.
"""
C = make_tc()
attrs, _, _ = _transform_attrs(C, None, False, False, True, None)
assert ["z", "y", "x"] == [a.name for a in attrs]
def test_empty(self):
"""
No attributes works as expected.
"""
@attr.s
class C:
pass
assert _Attributes(((), [], {})) == _transform_attrs(
C, None, False, False, True, None
)
def test_transforms_to_attribute(self):
"""
All `_CountingAttr`s are transformed into `Attribute`s.
"""
C = make_tc()
attrs, base_attrs, _ = _transform_attrs(
C, None, False, False, True, None
)
assert [] == base_attrs
assert 3 == len(attrs)
assert all(isinstance(a, Attribute) for a in attrs)
def test_conflicting_defaults(self):
"""
Raises `ValueError` if attributes with defaults are followed by
mandatory attributes.
"""
class C:
x = attr.ib(default=None)
y = attr.ib()
with pytest.raises(ValueError) as e:
_transform_attrs(C, None, False, False, True, None)
assert (
"No mandatory attributes allowed after an attribute with a "
"default value or factory. Attribute in question: Attribute"
"(name='y', default=NOTHING, validator=None, repr=True, "
"eq=True, eq_key=None, order=True, order_key=None, "
"hash=None, init=True, "
"metadata=mappingproxy({}), type=None, converter=None, "
"kw_only=False, inherited=False, on_setattr=None)",
) == e.value.args
def test_kw_only(self):
"""
Converts all attributes, including base class' attributes, if `kw_only`
is provided. Therefore, `kw_only` allows attributes with defaults to
precede mandatory attributes.
Updates in the subclass *don't* affect the base class attributes.
"""
@attr.s
class B:
b = attr.ib()
for b_a in B.__attrs_attrs__:
assert b_a.kw_only is False
class C(B):
x = attr.ib(default=None)
y = attr.ib()
attrs, base_attrs, _ = _transform_attrs(
C, None, False, True, True, None
)
assert len(attrs) == 3
assert len(base_attrs) == 1
for a in attrs:
assert a.kw_only is True
for b_a in B.__attrs_attrs__:
assert b_a.kw_only is False
def test_these(self):
"""
If these is passed, use it and ignore body and base classes.
"""
class Base:
z = attr.ib()
class C(Base):
y = attr.ib()
attrs, base_attrs, _ = _transform_attrs(
C, {"x": attr.ib()}, False, False, True, None
)
assert [] == base_attrs
assert (simple_attr("x"),) == attrs
def test_these_leave_body(self):
"""
If these is passed, no attributes are removed from the body.
"""
@attr.s(init=False, these={"x": attr.ib()})
class C:
x = 5
assert 5 == C().x
assert "C(x=5)" == repr(C())
def test_these_ordered(self):
"""
If these is passed ordered attrs, their order respect instead of the
counter.
"""
b = attr.ib(default=2)
a = attr.ib(default=1)
@attr.s(these=dict([("a", a), ("b", b)]))
class C:
pass
assert "C(a=1, b=2)" == repr(C())
def test_multiple_inheritance_old(self):
"""
Old multiple inheritance attribute collection behavior is retained.
See #285
"""
@attr.s
class A:
a1 = attr.ib(default="a1")
a2 = attr.ib(default="a2")
@attr.s
class B(A):
b1 = attr.ib(default="b1")
b2 = attr.ib(default="b2")
@attr.s
class C(B, A):
c1 = attr.ib(default="c1")
c2 = attr.ib(default="c2")
@attr.s
class D(A):
d1 = attr.ib(default="d1")
d2 = attr.ib(default="d2")
@attr.s
class E(C, D):
e1 = attr.ib(default="e1")
e2 = attr.ib(default="e2")
assert (
"E(a1='a1', a2='a2', b1='b1', b2='b2', c1='c1', c2='c2', d1='d1', "
"d2='d2', e1='e1', e2='e2')"
) == repr(E())
def test_overwrite_proper_mro(self):
"""
The proper MRO path works single overwrites too.
"""
@attr.s(collect_by_mro=True)
class C:
x = attr.ib(default=1)
@attr.s(collect_by_mro=True)
class D(C):
x = attr.ib(default=2)
assert "D(x=2)" == repr(D())
def test_multiple_inheritance_proper_mro(self):
"""
Attributes are collected according to the MRO.
See #428
"""
@attr.s
class A:
a1 = attr.ib(default="a1")
a2 = attr.ib(default="a2")
@attr.s
class B(A):
b1 = attr.ib(default="b1")
b2 = attr.ib(default="b2")
@attr.s
class C(B, A):
c1 = attr.ib(default="c1")
c2 = attr.ib(default="c2")
@attr.s
class D(A):
d1 = attr.ib(default="d1")
d2 = attr.ib(default="d2")
@attr.s(collect_by_mro=True)
class E(C, D):
e1 = attr.ib(default="e1")
e2 = attr.ib(default="e2")
assert (
"E(a1='a1', a2='a2', d1='d1', d2='d2', b1='b1', b2='b2', c1='c1', "
"c2='c2', e1='e1', e2='e2')"
) == repr(E())
def test_mro(self):
"""
Attributes and methods are looked up the same way.
See #428
"""
@attr.s(collect_by_mro=True)
class A:
x = attr.ib(10)
def xx(self):
return 10
@attr.s(collect_by_mro=True)
class B(A):
y = attr.ib(20)
@attr.s(collect_by_mro=True)
class C(A):
x = attr.ib(50)
def xx(self):
return 50
@attr.s(collect_by_mro=True)
class D(B, C):
pass
d = D()
assert d.x == d.xx()
def test_inherited(self):
"""
Inherited Attributes have `.inherited` True, otherwise False.
"""
@attr.s
class A:
a = attr.ib()
@attr.s
class B(A):
b = attr.ib()
@attr.s
class C(B):
a = attr.ib()
c = attr.ib()
f = attr.fields
assert False is f(A).a.inherited
assert True is f(B).a.inherited
assert False is f(B).b.inherited
assert False is f(C).a.inherited
assert True is f(C).b.inherited
assert False is f(C).c.inherited
class TestAttributes:
"""
Tests for the `attrs`/`attr.s` class decorator.
"""
def test_sets_attrs(self):
"""
Sets the `__attrs_attrs__` class attribute with a list of `Attribute`s.
"""
@attr.s
class C:
x = attr.ib()
assert "x" == C.__attrs_attrs__[0].name
assert all(isinstance(a, Attribute) for a in C.__attrs_attrs__)
def test_empty(self):
"""
No attributes, no problems.
"""
@attr.s
class C3:
pass
assert "C3()" == repr(C3())
assert C3() == C3()
@given(attr=attrs_st, attr_name=sampled_from(Attribute.__slots__))
def test_immutable(self, attr, attr_name):
"""
Attribute instances are immutable.
"""
with pytest.raises(AttributeError):
setattr(attr, attr_name, 1)
@pytest.mark.parametrize(
"method_name", ["__repr__", "__eq__", "__hash__", "__init__"]
)
def test_adds_all_by_default(self, method_name):
"""
If no further arguments are supplied, all add_XXX functions except
add_hash are applied. __hash__ is set to None.
"""
# Set the method name to a sentinel and check whether it has been
# overwritten afterwards.
sentinel = object()
class C:
x = attr.ib()
setattr(C, method_name, sentinel)
C = attr.s(C)
meth = getattr(C, method_name)
assert sentinel != meth
if method_name == "__hash__":
assert meth is None
@pytest.mark.parametrize(
"arg_name, method_name",
[
("repr", "__repr__"),
("eq", "__eq__"),
("order", "__le__"),
("hash", "__hash__"),
("init", "__init__"),
],
)
def test_respects_add_arguments(self, arg_name, method_name):
"""
If a certain `XXX` is `False`, `__XXX__` is not added to the class.
"""
# Set the method name to a sentinel and check whether it has been
# overwritten afterwards.
sentinel = object()
am_args = {
"repr": True,
"eq": True,
"order": True,
"hash": True,
"init": True,
}
am_args[arg_name] = False
if arg_name == "eq":
am_args["order"] = False
class C:
x = attr.ib()
setattr(C, method_name, sentinel)
C = attr.s(**am_args)(C)
assert sentinel == getattr(C, method_name)
@pytest.mark.parametrize("init", [True, False])
def test_respects_init_attrs_init(self, init):
"""
If init=False, adds __attrs_init__ to the class.
Otherwise, it does not.
"""
class C:
x = attr.ib()
C = attr.s(init=init)(C)
assert hasattr(C, "__attrs_init__") != init
@given(slots_outer=booleans(), slots_inner=booleans())
def test_repr_qualname(self, slots_outer, slots_inner):
"""
On Python 3, the name in repr is the __qualname__.
"""
@attr.s(slots=slots_outer)
class C:
@attr.s(slots=slots_inner)
class D:
pass
assert "C.D()" == repr(C.D())
assert "GC.D()" == repr(GC.D())
@given(slots_outer=booleans(), slots_inner=booleans())
def test_repr_fake_qualname(self, slots_outer, slots_inner):
"""
Setting repr_ns overrides a potentially guessed namespace.
"""
@attr.s(slots=slots_outer)
class C:
@attr.s(repr_ns="C", slots=slots_inner)
class D:
pass
assert "C.D()" == repr(C.D())
@given(slots_outer=booleans(), slots_inner=booleans())
def test_name_not_overridden(self, slots_outer, slots_inner):
"""
On Python 3, __name__ is different from __qualname__.
"""
@attr.s(slots=slots_outer)
class C:
@attr.s(slots=slots_inner)
class D:
pass
assert C.D.__name__ == "D"
assert C.D.__qualname__ == C.__qualname__ + ".D"
@pytest.mark.parametrize("with_validation", [True, False])
def test_pre_init(self, with_validation, monkeypatch):
"""
Verify that __attrs_pre_init__ gets called if defined.
"""
monkeypatch.setattr(_config, "_run_validators", with_validation)
@attr.s
class C:
def __attrs_pre_init__(self2):
self2.z = 30
c = C()
assert 30 == getattr(c, "z", None)
@pytest.mark.parametrize("with_validation", [True, False])
def test_post_init(self, with_validation, monkeypatch):
"""
Verify that __attrs_post_init__ gets called if defined.
"""
monkeypatch.setattr(_config, "_run_validators", with_validation)
@attr.s
class C:
x = attr.ib()
y = attr.ib()
def __attrs_post_init__(self2):
self2.z = self2.x + self2.y
c = C(x=10, y=20)
assert 30 == getattr(c, "z", None)
@pytest.mark.parametrize("with_validation", [True, False])
def test_pre_post_init_order(self, with_validation, monkeypatch):
"""
Verify that __attrs_post_init__ gets called if defined.
"""
monkeypatch.setattr(_config, "_run_validators", with_validation)
@attr.s
class C:
x = attr.ib()
def __attrs_pre_init__(self2):
self2.z = 30
def __attrs_post_init__(self2):
self2.z += self2.x
c = C(x=10)
assert 40 == getattr(c, "z", None)
def test_types(self):
"""
Sets the `Attribute.type` attr from type argument.
"""
@attr.s
class C:
x = attr.ib(type=int)
y = attr.ib(type=str)
z = attr.ib()
assert int is fields(C).x.type
assert str is fields(C).y.type
assert None is fields(C).z.type
@pytest.mark.parametrize("slots", [True, False])
def test_clean_class(self, slots):
"""
Attribute definitions do not appear on the class body after @attr.s.
"""
@attr.s(slots=slots)
class C:
x = attr.ib()
x = getattr(C, "x", None)
assert not isinstance(x, _CountingAttr)
def test_factory_sugar(self):
"""
Passing factory=f is syntactic sugar for passing default=Factory(f).
"""
@attr.s
class C:
x = attr.ib(factory=list)
assert Factory(list) == attr.fields(C).x.default
def test_sugar_factory_mutex(self):
"""
Passing both default and factory raises ValueError.
"""
with pytest.raises(ValueError, match="mutually exclusive"):
@attr.s
class C:
x = attr.ib(factory=list, default=Factory(list))
def test_sugar_callable(self):
"""
Factory has to be a callable to prevent people from passing Factory
into it.
"""
with pytest.raises(ValueError, match="must be a callable"):
@attr.s
class C:
x = attr.ib(factory=Factory(list))
def test_inherited_does_not_affect_hashing_and_equality(self):
"""
Whether or not an Attribute has been inherited doesn't affect how it's
hashed and compared.
"""
@attr.s
class BaseClass:
x = attr.ib()
@attr.s
class SubClass(BaseClass):
pass
ba = attr.fields(BaseClass)[0]
sa = attr.fields(SubClass)[0]
assert ba == sa
assert hash(ba) == hash(sa)
class TestKeywordOnlyAttributes:
"""
Tests for keyword-only attributes.
"""
def test_adds_keyword_only_arguments(self):
"""
Attributes can be added as keyword-only.
"""
@attr.s
class C:
a = attr.ib()
b = attr.ib(default=2, kw_only=True)
c = attr.ib(kw_only=True)
d = attr.ib(default=attr.Factory(lambda: 4), kw_only=True)
c = C(1, c=3)
assert c.a == 1
assert c.b == 2
assert c.c == 3
assert c.d == 4
def test_ignores_kw_only_when_init_is_false(self):
"""
Specifying ``kw_only=True`` when ``init=False`` is essentially a no-op.
"""
@attr.s
class C:
x = attr.ib(init=False, default=0, kw_only=True)
y = attr.ib()
c = C(1)
assert c.x == 0
assert c.y == 1
def test_keyword_only_attributes_presence(self):
"""
Raises `TypeError` when keyword-only arguments are
not specified.
"""
@attr.s
class C:
x = attr.ib(kw_only=True)
with pytest.raises(TypeError) as e:
C()
assert (
"missing 1 required keyword-only argument: 'x'"
) in e.value.args[0]
def test_keyword_only_attributes_unexpected(self):
"""
Raises `TypeError` when unexpected keyword argument passed.
"""
@attr.s
class C:
x = attr.ib(kw_only=True)
with pytest.raises(TypeError) as e:
C(x=5, y=10)
assert "got an unexpected keyword argument 'y'" in e.value.args[0]
def test_keyword_only_attributes_can_come_in_any_order(self):
"""
Mandatory vs non-mandatory attr order only matters when they are part
of the __init__ signature and when they aren't kw_only (which are
moved to the end and can be mandatory or non-mandatory in any order,
as they will be specified as keyword args anyway).
"""
@attr.s
class C:
a = attr.ib(kw_only=True)
b = attr.ib(kw_only=True, default="b")
c = attr.ib(kw_only=True)
d = attr.ib()
e = attr.ib(default="e")
f = attr.ib(kw_only=True)
g = attr.ib(kw_only=True, default="g")
h = attr.ib(kw_only=True)
i = attr.ib(init=False)
c = C("d", a="a", c="c", f="f", h="h")
assert c.a == "a"
assert c.b == "b"
assert c.c == "c"
assert c.d == "d"
assert c.e == "e"
assert c.f == "f"
assert c.g == "g"
assert c.h == "h"
def test_keyword_only_attributes_allow_subclassing(self):
"""
Subclass can define keyword-only attributed without defaults,
when the base class has attributes with defaults.
"""
@attr.s
class Base:
x = attr.ib(default=0)
@attr.s
class C(Base):
y = attr.ib(kw_only=True)
c = C(y=1)
assert c.x == 0
assert c.y == 1
def test_keyword_only_class_level(self):
"""
`kw_only` can be provided at the attr.s level, converting all
attributes to `kw_only.`
"""
@attr.s(kw_only=True)
class C:
x = attr.ib()
y = attr.ib(kw_only=True)
with pytest.raises(TypeError):
C(0, y=1)
c = C(x=0, y=1)
assert c.x == 0
assert c.y == 1
def test_keyword_only_class_level_subclassing(self):
"""
Subclass `kw_only` propagates to attrs inherited from the base,
allowing non-default following default.
"""
@attr.s
class Base:
x = attr.ib(default=0)
@attr.s(kw_only=True)
class C(Base):
y = attr.ib()
with pytest.raises(TypeError):
C(1)
c = C(x=0, y=1)
assert c.x == 0
assert c.y == 1
def test_init_false_attribute_after_keyword_attribute(self):
"""
A positional attribute cannot follow a `kw_only` attribute,
but an `init=False` attribute can because it won't appear
in `__init__`
"""
@attr.s
class KwArgBeforeInitFalse:
kwarg = attr.ib(kw_only=True)
non_init_function_default = attr.ib(init=False)
non_init_keyword_default = attr.ib(
init=False, default="default-by-keyword"
)
@non_init_function_default.default
def _init_to_init(self):
return self.kwarg + "b"
c = KwArgBeforeInitFalse(kwarg="a")
assert c.kwarg == "a"
assert c.non_init_function_default == "ab"
assert c.non_init_keyword_default == "default-by-keyword"
def test_init_false_attribute_after_keyword_attribute_with_inheritance(
self,
):
"""
A positional attribute cannot follow a `kw_only` attribute,
but an `init=False` attribute can because it won't appear
in `__init__`. This test checks that we allow this
even when the `kw_only` attribute appears in a parent class
"""
@attr.s
class KwArgBeforeInitFalseParent:
kwarg = attr.ib(kw_only=True)
@attr.s
class KwArgBeforeInitFalseChild(KwArgBeforeInitFalseParent):
non_init_function_default = attr.ib(init=False)
non_init_keyword_default = attr.ib(
init=False, default="default-by-keyword"
)
@non_init_function_default.default
def _init_to_init(self):
return self.kwarg + "b"
c = KwArgBeforeInitFalseChild(kwarg="a")
assert c.kwarg == "a"
assert c.non_init_function_default == "ab"
assert c.non_init_keyword_default == "default-by-keyword"
@attr.s
class GC:
@attr.s
class D:
pass
class TestMakeClass:
"""
Tests for `make_class`.
"""
@pytest.mark.parametrize("ls", [list, tuple])
def test_simple(self, ls):
"""
Passing a list of strings creates attributes with default args.
"""
C1 = make_class("C1", ls(["a", "b"]))
@attr.s
class C2:
a = attr.ib()
b = attr.ib()
assert C1.__attrs_attrs__ == C2.__attrs_attrs__
def test_dict(self):
"""
Passing a dict of name: _CountingAttr creates an equivalent class.
"""