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f5817c24f4
If the result type is bytes, then calling bytes() on it does nothing. If the result type is not bytes, we should not cast to bytes, just because the return value may be bytes.
284 lines
8.5 KiB
Python
284 lines
8.5 KiB
Python
from unittest import mock
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from django.test import SimpleTestCase
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from django.utils.functional import cached_property, classproperty, lazy
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from django.utils.version import PY312
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class FunctionalTests(SimpleTestCase):
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def test_lazy(self):
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t = lazy(lambda: tuple(range(3)), list, tuple)
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for a, b in zip(t(), range(3)):
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self.assertEqual(a, b)
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def test_lazy_base_class(self):
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"""lazy also finds base class methods in the proxy object"""
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class Base:
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def base_method(self):
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pass
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class Klazz(Base):
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pass
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t = lazy(lambda: Klazz(), Klazz)()
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self.assertIn("base_method", dir(t))
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def test_lazy_base_class_override(self):
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"""lazy finds the correct (overridden) method implementation"""
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class Base:
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def method(self):
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return "Base"
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class Klazz(Base):
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def method(self):
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return "Klazz"
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t = lazy(lambda: Klazz(), Base)()
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self.assertEqual(t.method(), "Klazz")
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def test_lazy_object_to_string(self):
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class Klazz:
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def __str__(self):
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return "Î am ā Ǩlâzz."
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def __bytes__(self):
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return b"\xc3\x8e am \xc4\x81 binary \xc7\xa8l\xc3\xa2zz."
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t = lazy(lambda: Klazz(), Klazz)()
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self.assertEqual(str(t), "Î am ā Ǩlâzz.")
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self.assertEqual(bytes(t), b"\xc3\x8e am \xc4\x81 binary \xc7\xa8l\xc3\xa2zz.")
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def assertCachedPropertyWorks(self, attr, Class):
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with self.subTest(attr=attr):
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def get(source):
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return getattr(source, attr)
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obj = Class()
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class SubClass(Class):
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pass
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subobj = SubClass()
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# Docstring is preserved.
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self.assertEqual(get(Class).__doc__, "Here is the docstring...")
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self.assertEqual(get(SubClass).__doc__, "Here is the docstring...")
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# It's cached.
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self.assertEqual(get(obj), get(obj))
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self.assertEqual(get(subobj), get(subobj))
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# The correct value is returned.
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self.assertEqual(get(obj)[0], 1)
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self.assertEqual(get(subobj)[0], 1)
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# State isn't shared between instances.
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obj2 = Class()
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subobj2 = SubClass()
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self.assertNotEqual(get(obj), get(obj2))
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self.assertNotEqual(get(subobj), get(subobj2))
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# It behaves like a property when there's no instance.
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self.assertIsInstance(get(Class), cached_property)
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self.assertIsInstance(get(SubClass), cached_property)
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# 'other_value' doesn't become a property.
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self.assertTrue(callable(obj.other_value))
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self.assertTrue(callable(subobj.other_value))
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def test_cached_property(self):
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"""cached_property caches its value and behaves like a property."""
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class Class:
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@cached_property
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def value(self):
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"""Here is the docstring..."""
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return 1, object()
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@cached_property
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def __foo__(self):
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"""Here is the docstring..."""
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return 1, object()
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def other_value(self):
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"""Here is the docstring..."""
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return 1, object()
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other = cached_property(other_value)
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attrs = ["value", "other", "__foo__"]
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for attr in attrs:
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self.assertCachedPropertyWorks(attr, Class)
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def test_cached_property_auto_name(self):
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"""
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cached_property caches its value and behaves like a property
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on mangled methods or when the name kwarg isn't set.
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"""
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class Class:
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@cached_property
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def __value(self):
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"""Here is the docstring..."""
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return 1, object()
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def other_value(self):
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"""Here is the docstring..."""
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return 1, object()
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other = cached_property(other_value)
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attrs = ["_Class__value", "other"]
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for attr in attrs:
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self.assertCachedPropertyWorks(attr, Class)
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def test_cached_property_reuse_different_names(self):
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"""Disallow this case because the decorated function wouldn't be cached."""
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type_msg = (
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"Cannot assign the same cached_property to two different names ('a' and "
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"'b')."
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)
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if PY312:
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error_type = TypeError
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msg = type_msg
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else:
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error_type = RuntimeError
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msg = "Error calling __set_name__"
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with self.assertRaisesMessage(error_type, msg) as ctx:
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class ReusedCachedProperty:
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@cached_property
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def a(self):
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pass
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b = a
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if not PY312:
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self.assertEqual(str(ctx.exception.__context__), str(TypeError(type_msg)))
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def test_cached_property_reuse_same_name(self):
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"""
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Reusing a cached_property on different classes under the same name is
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allowed.
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"""
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counter = 0
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@cached_property
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def _cp(_self):
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nonlocal counter
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counter += 1
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return counter
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class A:
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cp = _cp
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class B:
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cp = _cp
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a = A()
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b = B()
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self.assertEqual(a.cp, 1)
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self.assertEqual(b.cp, 2)
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self.assertEqual(a.cp, 1)
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def test_cached_property_set_name_not_called(self):
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cp = cached_property(lambda s: None)
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class Foo:
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pass
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Foo.cp = cp
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msg = (
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"Cannot use cached_property instance without calling __set_name__() on it."
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)
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with self.assertRaisesMessage(TypeError, msg):
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Foo().cp
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def test_lazy_add(self):
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lazy_4 = lazy(lambda: 4, int)
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lazy_5 = lazy(lambda: 5, int)
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self.assertEqual(lazy_4() + lazy_5(), 9)
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def test_lazy_equality(self):
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"""
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== and != work correctly for Promises.
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"""
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lazy_a = lazy(lambda: 4, int)
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lazy_b = lazy(lambda: 4, int)
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lazy_c = lazy(lambda: 5, int)
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self.assertEqual(lazy_a(), lazy_b())
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self.assertNotEqual(lazy_b(), lazy_c())
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def test_lazy_repr_text(self):
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original_object = "Lazy translation text"
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lazy_obj = lazy(lambda: original_object, str)
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self.assertEqual(repr(original_object), repr(lazy_obj()))
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def test_lazy_repr_int(self):
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original_object = 15
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lazy_obj = lazy(lambda: original_object, int)
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self.assertEqual(repr(original_object), repr(lazy_obj()))
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def test_lazy_repr_bytes(self):
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original_object = b"J\xc3\xbcst a str\xc3\xadng"
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lazy_obj = lazy(lambda: original_object, bytes)
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self.assertEqual(repr(original_object), repr(lazy_obj()))
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def test_lazy_class_preparation_caching(self):
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# lazy() should prepare the proxy class only once i.e. the first time
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# it's used.
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lazified = lazy(lambda: 0, int)
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__proxy__ = lazified().__class__
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with mock.patch.object(__proxy__, "__prepare_class__") as mocked:
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lazified()
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mocked.assert_not_called()
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def test_lazy_bytes_and_str_result_classes(self):
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lazy_obj = lazy(lambda: "test", str, bytes)
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msg = "Cannot call lazy() with both bytes and text return types."
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with self.assertRaisesMessage(ValueError, msg):
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lazy_obj()
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def test_lazy_str_cast_mixed_result_types(self):
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lazy_value = lazy(lambda: [1], str, list)()
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self.assertEqual(str(lazy_value), "[1]")
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def test_lazy_str_cast_mixed_bytes_result_types(self):
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lazy_value = lazy(lambda: [1], bytes, list)()
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self.assertEqual(str(lazy_value), "[1]")
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def test_classproperty_getter(self):
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class Foo:
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foo_attr = 123
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def __init__(self):
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self.foo_attr = 456
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@classproperty
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def foo(cls):
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return cls.foo_attr
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class Bar:
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bar = classproperty()
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@bar.getter
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def bar(cls):
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return 123
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self.assertEqual(Foo.foo, 123)
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self.assertEqual(Foo().foo, 123)
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self.assertEqual(Bar.bar, 123)
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self.assertEqual(Bar().bar, 123)
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def test_classproperty_override_getter(self):
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class Foo:
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@classproperty
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def foo(cls):
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return 123
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@foo.getter
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def foo(cls):
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return 456
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self.assertEqual(Foo.foo, 456)
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self.assertEqual(Foo().foo, 456)
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