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"""Unit tests for new super() implementation."""
import sys
import unittest
class A:
def f(self):
return 'A'
@classmethod
def cm(cls):
return (cls, 'A')
class B(A):
def f(self):
return super().f() + 'B'
@classmethod
def cm(cls):
return (cls, super().cm(), 'B')
class C(A):
def f(self):
return super().f() + 'C'
@classmethod
def cm(cls):
return (cls, super().cm(), 'C')
class D(C, B):
def f(self):
return super().f() + 'D'
def cm(cls):
return (cls, super().cm(), 'D')
class E(D):
pass
class F(E):
f = E.f
class G(A):
pass
class TestSuper(unittest.TestCase):
def tearDown(self):
# This fixes the damage that test_various___class___pathologies does.
nonlocal __class__
__class__ = TestSuper
def test_basics_working(self):
self.assertEqual(D().f(), 'ABCD')
def test_class_getattr_working(self):
self.assertEqual(D.f(D()), 'ABCD')
def test_subclass_no_override_working(self):
self.assertEqual(E().f(), 'ABCD')
self.assertEqual(E.f(E()), 'ABCD')
def test_unbound_method_transfer_working(self):
self.assertEqual(F().f(), 'ABCD')
self.assertEqual(F.f(F()), 'ABCD')
def test_class_methods_still_working(self):
self.assertEqual(A.cm(), (A, 'A'))
self.assertEqual(A().cm(), (A, 'A'))
self.assertEqual(G.cm(), (G, 'A'))
self.assertEqual(G().cm(), (G, 'A'))
def test_super_in_class_methods_working(self):
d = D()
self.assertEqual(d.cm(), (d, (D, (D, (D, 'A'), 'B'), 'C'), 'D'))
e = E()
self.assertEqual(e.cm(), (e, (E, (E, (E, 'A'), 'B'), 'C'), 'D'))
def test_super_with_closure(self):
# Issue4360: super() did not work in a function that
# contains a closure
class E(A):
def f(self):
def nested():
self
return super().f() + 'E'
self.assertEqual(E().f(), 'AE')
def test_various___class___pathologies(self):
# See issue #12370
class X(A):
def f(self):
return super().f()
__class__ = 413
x = X()
self.assertEqual(x.f(), 'A')
self.assertEqual(x.__class__, 413)
class X:
x = __class__
def f():
__class__
self.assertIs(X.x, type(self))
with self.assertRaises(NameError) as e:
exec("""class X:
__class__
def f():
__class__""", globals(), {})
self.assertIs(type(e.exception), NameError) # Not UnboundLocalError
class X:
global __class__
__class__ = 42
def f():
__class__
self.assertEqual(globals()["__class__"], 42)
del globals()["__class__"]
self.assertNotIn("__class__", X.__dict__)
class X:
nonlocal __class__
__class__ = 42
def f():
__class__
self.assertEqual(__class__, 42)
def test___class___instancemethod(self):
# See issue #14857
class X:
def f(self):
return __class__
self.assertIs(X().f(), X)
def test___class___classmethod(self):
# See issue #14857
class X:
@classmethod
def f(cls):
return __class__
self.assertIs(X.f(), X)
def test___class___staticmethod(self):
# See issue #14857
class X:
@staticmethod
def f():
return __class__
self.assertIs(X.f(), X)
def test___class___new(self):
test_class = None
class Meta(type):
def __new__(cls, name, bases, namespace):
nonlocal test_class
self = super().__new__(cls, name, bases, namespace)
test_class = self.f()
return self
class A(metaclass=Meta):
@staticmethod
def f():
return __class__
self.assertIs(test_class, A)
def test___class___delayed(self):
test_namespace = None
class Meta(type):
def __new__(cls, name, bases, namespace):
nonlocal test_namespace
test_namespace = namespace
return None
class A(metaclass=Meta):
@staticmethod
def f():
return __class__
self.assertIs(A, None)
B = type("B", (), test_namespace)
self.assertIs(B.f(), B)
def test___class___mro(self):
test_class = None
class Meta(type):
def mro(self):
# self.f() doesn't work yet...
self.__dict__["f"]()
return super().mro()
class A(metaclass=Meta):
def f():
nonlocal test_class
test_class = __class__
self.assertIs(test_class, A)
def test___classcell___deleted(self):
class Meta(type):
def __new__(cls, name, bases, namespace):
del namespace['__classcell__']
return super().__new__(cls, name, bases, namespace)
class A(metaclass=Meta):
@staticmethod
def f():
__class__
with self.assertRaises(NameError):
A.f()
def test___classcell___reset(self):
class Meta(type):
def __new__(cls, name, bases, namespace):
namespace['__classcell__'] = 0
return super().__new__(cls, name, bases, namespace)
class A(metaclass=Meta):
@staticmethod
def f():
__class__
with self.assertRaises(NameError):
A.f()
self.assertEqual(A.__classcell__, 0)
def test_obscure_super_errors(self):
def f():
super()
self.assertRaises(RuntimeError, f)
def f(x):
del x
super()
self.assertRaises(RuntimeError, f, None)
class X:
def f(x):
nonlocal __class__
del __class__
super()
self.assertRaises(RuntimeError, X().f)
def test_cell_as_self(self):
class X:
def meth(self):
super()
def f():
k = X()
def g():
return k
return g
c = f().__closure__[0]
self.assertRaises(TypeError, X.meth, c)
def test_super_init_leaks(self):
# Issue #26718: super.__init__ leaked memory if called multiple times.
# This will be caught by regrtest.py -R if this leak.
# NOTE: Despite the use in the test a direct call of super.__init__
# is not endorsed.
sp = super(float, 1.0)
for i in range(1000):
super.__init__(sp, int, i)
if __name__ == "__main__":
unittest.main()
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