mirror of https://github.com/django/django.git
338 lines
11 KiB
Python
338 lines
11 KiB
Python
from django.test import SimpleTestCase
|
|
from django.utils.functional import cached_property, classproperty, lazy
|
|
from django.utils.version import PY312
|
|
|
|
|
|
class FunctionalTests(SimpleTestCase):
|
|
def test_lazy(self):
|
|
t = lazy(lambda: tuple(range(3)), list, tuple)
|
|
for a, b in zip(t(), range(3)):
|
|
self.assertEqual(a, b)
|
|
|
|
def test_lazy_base_class(self):
|
|
"""lazy also finds base class methods in the proxy object"""
|
|
|
|
class Base:
|
|
def base_method(self):
|
|
pass
|
|
|
|
class Klazz(Base):
|
|
pass
|
|
|
|
t = lazy(lambda: Klazz(), Klazz)()
|
|
self.assertIn("base_method", dir(t))
|
|
|
|
def test_lazy_base_class_override(self):
|
|
"""lazy finds the correct (overridden) method implementation"""
|
|
|
|
class Base:
|
|
def method(self):
|
|
return "Base"
|
|
|
|
class Klazz(Base):
|
|
def method(self):
|
|
return "Klazz"
|
|
|
|
t = lazy(lambda: Klazz(), Base)()
|
|
self.assertEqual(t.method(), "Klazz")
|
|
|
|
def test_lazy_object_to_string(self):
|
|
class Klazz:
|
|
def __str__(self):
|
|
return "Î am ā Ǩlâzz."
|
|
|
|
def __bytes__(self):
|
|
return b"\xc3\x8e am \xc4\x81 binary \xc7\xa8l\xc3\xa2zz."
|
|
|
|
t = lazy(lambda: Klazz(), Klazz)()
|
|
self.assertEqual(str(t), "Î am ā Ǩlâzz.")
|
|
self.assertEqual(bytes(t), b"\xc3\x8e am \xc4\x81 binary \xc7\xa8l\xc3\xa2zz.")
|
|
|
|
def assertCachedPropertyWorks(self, attr, Class):
|
|
with self.subTest(attr=attr):
|
|
|
|
def get(source):
|
|
return getattr(source, attr)
|
|
|
|
obj = Class()
|
|
|
|
class SubClass(Class):
|
|
pass
|
|
|
|
subobj = SubClass()
|
|
# Docstring is preserved.
|
|
self.assertEqual(get(Class).__doc__, "Here is the docstring...")
|
|
self.assertEqual(get(SubClass).__doc__, "Here is the docstring...")
|
|
# It's cached.
|
|
self.assertEqual(get(obj), get(obj))
|
|
self.assertEqual(get(subobj), get(subobj))
|
|
# The correct value is returned.
|
|
self.assertEqual(get(obj)[0], 1)
|
|
self.assertEqual(get(subobj)[0], 1)
|
|
# State isn't shared between instances.
|
|
obj2 = Class()
|
|
subobj2 = SubClass()
|
|
self.assertNotEqual(get(obj), get(obj2))
|
|
self.assertNotEqual(get(subobj), get(subobj2))
|
|
# It behaves like a property when there's no instance.
|
|
self.assertIsInstance(get(Class), cached_property)
|
|
self.assertIsInstance(get(SubClass), cached_property)
|
|
# 'other_value' doesn't become a property.
|
|
self.assertTrue(callable(obj.other_value))
|
|
self.assertTrue(callable(subobj.other_value))
|
|
|
|
def test_cached_property(self):
|
|
"""cached_property caches its value and behaves like a property."""
|
|
|
|
class Class:
|
|
@cached_property
|
|
def value(self):
|
|
"""Here is the docstring..."""
|
|
return 1, object()
|
|
|
|
@cached_property
|
|
def __foo__(self):
|
|
"""Here is the docstring..."""
|
|
return 1, object()
|
|
|
|
def other_value(self):
|
|
"""Here is the docstring..."""
|
|
return 1, object()
|
|
|
|
other = cached_property(other_value)
|
|
|
|
attrs = ["value", "other", "__foo__"]
|
|
for attr in attrs:
|
|
self.assertCachedPropertyWorks(attr, Class)
|
|
|
|
def test_cached_property_auto_name(self):
|
|
"""
|
|
cached_property caches its value and behaves like a property
|
|
on mangled methods or when the name kwarg isn't set.
|
|
"""
|
|
|
|
class Class:
|
|
@cached_property
|
|
def __value(self):
|
|
"""Here is the docstring..."""
|
|
return 1, object()
|
|
|
|
def other_value(self):
|
|
"""Here is the docstring..."""
|
|
return 1, object()
|
|
|
|
other = cached_property(other_value)
|
|
|
|
attrs = ["_Class__value", "other"]
|
|
for attr in attrs:
|
|
self.assertCachedPropertyWorks(attr, Class)
|
|
|
|
def test_cached_property_reuse_different_names(self):
|
|
"""Disallow this case because the decorated function wouldn't be cached."""
|
|
type_msg = (
|
|
"Cannot assign the same cached_property to two different names ('a' and "
|
|
"'b')."
|
|
)
|
|
if PY312:
|
|
error_type = TypeError
|
|
msg = type_msg
|
|
else:
|
|
error_type = RuntimeError
|
|
msg = "Error calling __set_name__"
|
|
|
|
with self.assertRaisesMessage(error_type, msg) as ctx:
|
|
|
|
class ReusedCachedProperty:
|
|
@cached_property
|
|
def a(self):
|
|
pass
|
|
|
|
b = a
|
|
|
|
if not PY312:
|
|
self.assertEqual(str(ctx.exception.__context__), str(TypeError(type_msg)))
|
|
|
|
def test_cached_property_reuse_same_name(self):
|
|
"""
|
|
Reusing a cached_property on different classes under the same name is
|
|
allowed.
|
|
"""
|
|
counter = 0
|
|
|
|
@cached_property
|
|
def _cp(_self):
|
|
nonlocal counter
|
|
counter += 1
|
|
return counter
|
|
|
|
class A:
|
|
cp = _cp
|
|
|
|
class B:
|
|
cp = _cp
|
|
|
|
a = A()
|
|
b = B()
|
|
self.assertEqual(a.cp, 1)
|
|
self.assertEqual(b.cp, 2)
|
|
self.assertEqual(a.cp, 1)
|
|
|
|
def test_cached_property_set_name_not_called(self):
|
|
cp = cached_property(lambda s: None)
|
|
|
|
class Foo:
|
|
pass
|
|
|
|
Foo.cp = cp
|
|
msg = (
|
|
"Cannot use cached_property instance without calling __set_name__() on it."
|
|
)
|
|
with self.assertRaisesMessage(TypeError, msg):
|
|
Foo().cp
|
|
|
|
def test_lazy_add_int(self):
|
|
lazy_4 = lazy(lambda: 4, int)
|
|
lazy_5 = lazy(lambda: 5, int)
|
|
self.assertEqual(4 + lazy_5(), 9)
|
|
self.assertEqual(lazy_4() + 5, 9)
|
|
self.assertEqual(lazy_4() + lazy_5(), 9)
|
|
|
|
def test_lazy_add_list(self):
|
|
lazy_4 = lazy(lambda: [4], list)
|
|
lazy_5 = lazy(lambda: [5], list)
|
|
self.assertEqual([4] + lazy_5(), [4, 5])
|
|
self.assertEqual(lazy_4() + [5], [4, 5])
|
|
self.assertEqual(lazy_4() + lazy_5(), [4, 5])
|
|
|
|
def test_lazy_add_str(self):
|
|
lazy_a = lazy(lambda: "a", str)
|
|
lazy_b = lazy(lambda: "b", str)
|
|
self.assertEqual("a" + lazy_b(), "ab")
|
|
self.assertEqual(lazy_a() + "b", "ab")
|
|
self.assertEqual(lazy_a() + lazy_b(), "ab")
|
|
|
|
def test_lazy_mod_int(self):
|
|
lazy_4 = lazy(lambda: 4, int)
|
|
lazy_5 = lazy(lambda: 5, int)
|
|
self.assertEqual(4 % lazy_5(), 4)
|
|
self.assertEqual(lazy_4() % 5, 4)
|
|
self.assertEqual(lazy_4() % lazy_5(), 4)
|
|
|
|
def test_lazy_mod_str(self):
|
|
lazy_a = lazy(lambda: "a%s", str)
|
|
lazy_b = lazy(lambda: "b", str)
|
|
self.assertEqual("a%s" % lazy_b(), "ab")
|
|
self.assertEqual(lazy_a() % "b", "ab")
|
|
self.assertEqual(lazy_a() % lazy_b(), "ab")
|
|
|
|
def test_lazy_mul_int(self):
|
|
lazy_4 = lazy(lambda: 4, int)
|
|
lazy_5 = lazy(lambda: 5, int)
|
|
self.assertEqual(4 * lazy_5(), 20)
|
|
self.assertEqual(lazy_4() * 5, 20)
|
|
self.assertEqual(lazy_4() * lazy_5(), 20)
|
|
|
|
def test_lazy_mul_list(self):
|
|
lazy_4 = lazy(lambda: [4], list)
|
|
lazy_5 = lazy(lambda: 5, int)
|
|
self.assertEqual([4] * lazy_5(), [4, 4, 4, 4, 4])
|
|
self.assertEqual(lazy_4() * 5, [4, 4, 4, 4, 4])
|
|
self.assertEqual(lazy_4() * lazy_5(), [4, 4, 4, 4, 4])
|
|
|
|
def test_lazy_mul_str(self):
|
|
lazy_a = lazy(lambda: "a", str)
|
|
lazy_5 = lazy(lambda: 5, int)
|
|
self.assertEqual("a" * lazy_5(), "aaaaa")
|
|
self.assertEqual(lazy_a() * 5, "aaaaa")
|
|
self.assertEqual(lazy_a() * lazy_5(), "aaaaa")
|
|
|
|
def test_lazy_format(self):
|
|
class QuotedString(str):
|
|
def __format__(self, format_spec):
|
|
value = super().__format__(format_spec)
|
|
return f"“{value}”"
|
|
|
|
lazy_f = lazy(lambda: QuotedString("Hello!"), QuotedString)
|
|
self.assertEqual(format(lazy_f(), ""), "“Hello!”")
|
|
f = lazy_f()
|
|
self.assertEqual(f"I said, {f}", "I said, “Hello!”")
|
|
|
|
def test_lazy_equality(self):
|
|
"""
|
|
== and != work correctly for Promises.
|
|
"""
|
|
lazy_a = lazy(lambda: 4, int)
|
|
lazy_b = lazy(lambda: 4, int)
|
|
lazy_c = lazy(lambda: 5, int)
|
|
|
|
self.assertEqual(lazy_a(), lazy_b())
|
|
self.assertNotEqual(lazy_b(), lazy_c())
|
|
|
|
def test_lazy_repr_text(self):
|
|
original_object = "Lazy translation text"
|
|
lazy_obj = lazy(lambda: original_object, str)
|
|
self.assertEqual(repr(original_object), repr(lazy_obj()))
|
|
|
|
def test_lazy_repr_int(self):
|
|
original_object = 15
|
|
lazy_obj = lazy(lambda: original_object, int)
|
|
self.assertEqual(repr(original_object), repr(lazy_obj()))
|
|
|
|
def test_lazy_repr_bytes(self):
|
|
original_object = b"J\xc3\xbcst a str\xc3\xadng"
|
|
lazy_obj = lazy(lambda: original_object, bytes)
|
|
self.assertEqual(repr(original_object), repr(lazy_obj()))
|
|
|
|
def test_lazy_regular_method(self):
|
|
original_object = 15
|
|
lazy_obj = lazy(lambda: original_object, int)
|
|
self.assertEqual(original_object.bit_length(), lazy_obj().bit_length())
|
|
|
|
def test_lazy_bytes_and_str_result_classes(self):
|
|
lazy_obj = lazy(lambda: "test", str, bytes)
|
|
self.assertEqual(str(lazy_obj()), "test")
|
|
|
|
def test_lazy_str_cast_mixed_result_types(self):
|
|
lazy_value = lazy(lambda: [1], str, list)()
|
|
self.assertEqual(str(lazy_value), "[1]")
|
|
|
|
def test_lazy_str_cast_mixed_bytes_result_types(self):
|
|
lazy_value = lazy(lambda: [1], bytes, list)()
|
|
self.assertEqual(str(lazy_value), "[1]")
|
|
|
|
def test_classproperty_getter(self):
|
|
class Foo:
|
|
foo_attr = 123
|
|
|
|
def __init__(self):
|
|
self.foo_attr = 456
|
|
|
|
@classproperty
|
|
def foo(cls):
|
|
return cls.foo_attr
|
|
|
|
class Bar:
|
|
bar = classproperty()
|
|
|
|
@bar.getter
|
|
def bar(cls):
|
|
return 123
|
|
|
|
self.assertEqual(Foo.foo, 123)
|
|
self.assertEqual(Foo().foo, 123)
|
|
self.assertEqual(Bar.bar, 123)
|
|
self.assertEqual(Bar().bar, 123)
|
|
|
|
def test_classproperty_override_getter(self):
|
|
class Foo:
|
|
@classproperty
|
|
def foo(cls):
|
|
return 123
|
|
|
|
@foo.getter
|
|
def foo(cls):
|
|
return 456
|
|
|
|
self.assertEqual(Foo.foo, 456)
|
|
self.assertEqual(Foo().foo, 456)
|