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import pytest
from snakeoil import obj
# sorry, but the name is good, just too long for these tests
make_DI = obj.DelayedInstantiation
make_DIkls = obj.DelayedInstantiation_kls
class TestDelayedInstantiation:
def test_simple(self):
t = tuple([1, 2, 3])
o = make_DI(tuple, lambda: t)
assert str(t) == str(o)
assert repr(t) == repr(o)
assert hash(t) == hash(o)
assert t <= o
assert t == o
assert t >= o
def test_descriptor_awareness(self):
def assertKls(
cls,
ignores=(),
default_ignores=(
"__new__",
"__init__",
"__init_subclass__",
"__getattribute__",
"__class__",
"__getnewargs__",
"__getstate__",
"__doc__",
"__class_getitem__",
),
):
required = set(
x for x in dir(cls) if x.startswith("__") and x.endswith("__")
)
missing = required.difference(obj.kls_descriptors)
missing.difference_update(obj.base_kls_descriptors)
missing.difference_update(default_ignores)
missing.difference_update(ignores)
assert (
not missing
), "object %r potentially has unsupported special " "attributes: %s" % (
cls,
", ".join(missing),
)
assertKls(object)
assertKls(1)
assertKls(object())
assertKls(list)
assertKls({})
assertKls(set())
def test_BaseDelayedObject(self):
# assert that all methods/descriptors of object
# are covered via the base.
o = set(dir(object)).difference(
f"__{x}__"
for x in (
"class",
"getattribute",
"new",
"init",
"init_subclass",
"getstate",
"doc",
)
)
diff = o.difference(obj.base_kls_descriptors)
assert not diff, (
"base delayed instantiation class should cover all of object, but "
"%r was spotted" % (",".join(sorted(diff)),)
)
assert obj.DelayedInstantiation_kls(int, "1") + 2 == 3
def test_klass_choice_optimization(self):
"""ensure that BaseDelayedObject is used whenever possible"""
# note object is an odd one- it actually has a __doc__, thus
# it must always be a custom
o = make_DI(object, object)
assert object.__getattribute__(o, "__class__") is not obj.BaseDelayedObject
class foon:
pass
o = make_DI(foon, foon)
cls = object.__getattribute__(o, "__class__")
assert cls is obj.BaseDelayedObject
# now ensure we always get the same kls back for derivatives
class foon:
def __bool__(self):
return True
o = make_DI(foon, foon)
cls = object.__getattribute__(o, "__class__")
assert cls is not obj.BaseDelayedObject
o = make_DI(foon, foon)
cls2 = object.__getattribute__(o, "__class__")
assert cls is cls2
def test__class__(self):
l = []
def f():
l.append(False)
return True
o = make_DI(bool, f)
assert isinstance(o, bool)
assert not l, "accessing __class__ shouldn't trigger instantiation"
def test__doc__(self):
l = []
def f():
l.append(True)
return foon()
class foon:
__doc__ = "monkey"
o = make_DI(foon, f)
assert o.__doc__ == "monkey"
assert not l, (
"in accessing __doc__, the instance was generated- "
"this is a class level attribute, thus shouldn't "
"trigger instantiation"
)
class TestPopattr:
class Object:
pass
def setup_method(self, method):
self.o = self.Object()
self.o.test = 1
def test_no_attrs(self):
# object without any attrs
with pytest.raises(AttributeError):
obj.popattr(object(), "nonexistent")
def test_nonexistent_attr(self):
# object with attr trying to get nonexistent attr
with pytest.raises(AttributeError):
obj.popattr(self.o, "nonexistent")
def test_fallback(self):
# object with attr trying to get nonexistent attr using fallback
value = obj.popattr(self.o, "nonexistent", 2)
assert value == 2
def test_removed_attr(self):
value = obj.popattr(self.o, "test")
assert value == 1
# verify that attr was removed from the object
with pytest.raises(AttributeError):
obj.popattr(self.o, "test")
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