def test_result_shadows_descriptor(self):
# The result of the function call should be stored in
# the object __dict__, shadowing the descriptor.
called = []
class Foo(object):
@lazy_property
def foo(self):
called.append('foo')
return 1
f = Foo()
self.assertTrue(isinstance(Foo.foo, lazy_property))
self.assertTrue(f.foo is f.foo)
self.assertTrue(f.foo is f.__dict__['foo']) # !
self.assertEqual(len(called), 1)
self.assertEqual(f.foo, 1)
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, 'foo')
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 2)
self.assertEqual(f.foo, 1)
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 2)
def test_result_shadows_descriptor(self):
# The result of the function call should be stored in
# the object __dict__, shadowing the descriptor.
called = []
class Foo(object):
@lazy_property
def foo(self):
called.append('foo')
return 1
f = Foo()
self.assertTrue(isinstance(Foo.foo, lazy_property))
self.assertTrue(f.foo is f.foo)
self.assertTrue(f.foo is f.__dict__['foo']) # !
self.assertEqual(len(called), 1)
self.assertEqual(f.foo, 1)
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, 'foo')
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 2)
self.assertEqual(f.foo, 1)
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 2)
def test_invalidate_uncalled_attribute(self):
# It should be possible to invalidate an empty attribute
# cache without causing harm.
called = []
class Foo(object):
@lazy_property
def foo(self):
called.append('foo')
return 1
f = Foo()
self.assertEqual(len(called), 0)
lazy_property.invalidate(f, 'foo') # Nothing happens
def test_invalidate_uncalled_attribute(self):
# It should be possible to invalidate an empty attribute
# cache without causing harm.
called = []
class Foo(object):
@lazy_property
def foo(self):
called.append('foo')
return 1
f = Foo()
self.assertEqual(len(called), 0)
lazy_property.invalidate(f, 'foo') # Nothing happens
def test_invalidate_subclass_attribute(self):
# Whereas lazy_property.invalidate CAN invalidate a subclass (cached) attribute.
called = []
class Bar(object):
@cached
def bar(self):
called.append('bar')
return 1
b = Bar()
self.assertEqual(b.bar, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(b, 'bar')
self.assertEqual(b.bar, 1)
self.assertEqual(len(called), 2)
def test_invalidate_reserved_attribute(self):
# It should be possible to invalidate a reserved lazy_property attribute.
called = []
class Foo(object):
@lazy_property
def __foo__(self):
called.append('foo')
return 1
f = Foo()
self.assertEqual(f.__foo__, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, '__foo__')
self.assertEqual(f.__foo__, 1)
self.assertEqual(len(called), 2)
def test_invalidate_subclass_attribute(self):
# Whereas lazy_property.invalidate CAN invalidate a subclass (cached) attribute.
called = []
class Bar(object):
@cached
def bar(self):
called.append('bar')
return 1
b = Bar()
self.assertEqual(b.bar, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(b, 'bar')
self.assertEqual(b.bar, 1)
self.assertEqual(len(called), 2)
def test_invalidate_reserved_attribute(self):
# It should be possible to invalidate a reserved lazy_property attribute.
called = []
class Foo(object):
@lazy_property
def __foo__(self):
called.append('foo')
return 1
f = Foo()
self.assertEqual(f.__foo__, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, '__foo__')
self.assertEqual(f.__foo__, 1)
self.assertEqual(len(called), 2)
def test_invalidate_attribute(self):
# It should be possible to invalidate a lazy_property attribute.
called = []
class Foo(object):
@lazy_property
def foo(self):
called.append("foo")
return 1
f = Foo()
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, "foo")
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 2)
def test_invalidate_private_attribute(self):
# It should be possible to invalidate a private lazy_property attribute.
called = []
class Foo(object):
@lazy_property
def __foo(self):
called.append('foo')
return 1
def get_foo(self):
return self.__foo
f = Foo()
self.assertEqual(f.get_foo(), 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, '__foo')
self.assertEqual(f.get_foo(), 1)
self.assertEqual(len(called), 2)
def test_invalidate_attribute_twice(self):
# It should be possible to invalidate a lazy_property attribute
# twice without causing harm.
called = []
class Foo(object):
@lazy_property
def foo(self):
called.append('foo')
return 1
f = Foo()
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, 'foo')
lazy_property.invalidate(f, 'foo') # Nothing happens
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 2)
def test_invalidate_attribute_twice(self):
# It should be possible to invalidate a lazy_property attribute
# twice without causing harm.
called = []
class Foo(object):
@lazy_property
def foo(self):
called.append('foo')
return 1
f = Foo()
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, 'foo')
lazy_property.invalidate(f, 'foo') # Nothing happens
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 2)
def test_invalidate_private_attribute(self):
# It should be possible to invalidate a private lazy_property attribute.
called = []
class Foo(object):
@lazy_property
def __foo(self):
called.append('foo')
return 1
def get_foo(self):
return self.__foo
f = Foo()
self.assertEqual(f.get_foo(), 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, '__foo')
self.assertEqual(f.get_foo(), 1)
self.assertEqual(len(called), 2)
def test_invalidate_mangled_attribute(self):
# It should be possible to invalidate a private lazy_property attribute
# by its mangled name.
called = []
class Foo(object):
@lazy_property
def __foo(self):
called.append("foo")
return 1
def get_foo(self):
return self.__foo
f = Foo()
self.assertEqual(f.get_foo(), 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, "_Foo__foo")
self.assertEqual(f.get_foo(), 1)
self.assertEqual(len(called), 2)
