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test_super.py
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359 lines (287 loc) · 9.67 KB
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"""Unit tests for new super() implementation."""
from __future__ import absolute_import, division, unicode_literals
import sys
from future.tests.base import unittest, skip26, expectedFailurePY2
from future import utils
from future.builtins import super
class A(object):
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 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')
@expectedFailurePY2 # not working yet: infinite loop
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')
# We declare this test invalid: __class__ should be a class.
# def test___class___set(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)
@unittest.skipIf(utils.PY2, "no __class__ on Py2")
def test___class___instancemethod(self):
# See issue #14857
class X(object):
def f(self):
return __class__
self.assertIs(X().f(), X)
@unittest.skipIf(utils.PY2, "no __class__ on Py2")
def test___class___classmethod(self):
# See issue #14857
class X(object):
@classmethod
def f(cls):
return __class__
self.assertIs(X.f(), X)
@unittest.skipIf(utils.PY2, "no __class__ on Py2")
def test___class___staticmethod(self):
# See issue #14857
class X(object):
@staticmethod
def f():
return __class__
self.assertIs(X.f(), X)
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(object):
# def f(x):
# nonlocal __class__
# del __class__
# super()
# self.assertRaises(RuntimeError, X().f)
def test_cell_as_self(self):
class X(object):
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_properties(self):
class Harmless(object):
bomb = ''
def walk(self):
return self.bomb
class Dangerous(Harmless):
@property
def bomb(self):
raise Exception("Kaboom")
def walk(self):
return super().walk()
class Elite(Dangerous):
bomb = 'Defused'
self.assertEqual(Elite().walk(), 'Defused')
def test_metaclass(self):
class Meta(type):
def __init__(cls, name, bases, clsdict):
super().__init__(name, bases, clsdict)
try:
class Base(object):
__metaclass__ = Meta
except Exception as e:
self.fail('raised %s with a custom metaclass'
% type(e).__name__)
class TestSuperFromTestDescrDotPy(unittest.TestCase):
"""
These are from Python 3.3.5/Lib/test/test_descr.py
"""
@skip26
def test_classmethods(self):
# Testing class methods...
class C(object):
def foo(*a): return a
goo = classmethod(foo)
c = C()
self.assertEqual(C.goo(1), (C, 1))
self.assertEqual(c.goo(1), (C, 1))
self.assertEqual(c.foo(1), (c, 1))
class D(C):
pass
d = D()
self.assertEqual(D.goo(1), (D, 1))
self.assertEqual(d.goo(1), (D, 1))
self.assertEqual(d.foo(1), (d, 1))
self.assertEqual(D.foo(d, 1), (d, 1))
# Test for a specific crash (SF bug 528132)
def f(cls, arg): return (cls, arg)
ff = classmethod(f)
self.assertEqual(ff.__get__(0, int)(42), (int, 42))
self.assertEqual(ff.__get__(0)(42), (int, 42))
# Test super() with classmethods (SF bug 535444)
self.assertEqual(C.goo.__self__, C)
self.assertEqual(D.goo.__self__, D)
self.assertEqual(super(D,D).goo.__self__, D)
self.assertEqual(super(D,d).goo.__self__, D)
self.assertEqual(super(D,D).goo(), (D,))
self.assertEqual(super(D,d).goo(), (D,))
# Verify that a non-callable will raise
meth = classmethod(1).__get__(1)
self.assertRaises(TypeError, meth)
# Verify that classmethod() doesn't allow keyword args
try:
classmethod(f, kw=1)
except TypeError:
pass
else:
self.fail("classmethod shouldn't accept keyword args")
# cm = classmethod(f)
# self.assertEqual(cm.__dict__, {})
# cm.x = 42
# self.assertEqual(cm.x, 42)
# self.assertEqual(cm.__dict__, {"x" : 42})
# del cm.x
# self.assertTrue(not hasattr(cm, "x"))
def test_supers(self):
# Testing super...
class A(object):
def meth(self, a):
return "A(%r)" % a
self.assertEqual(A().meth(1), "A(1)")
class B(A):
def __init__(self):
self.__super = super(B, self)
def meth(self, a):
return "B(%r)" % a + self.__super.meth(a)
self.assertEqual(B().meth(2), "B(2)A(2)")
class C(A):
def meth(self, a):
return "C(%r)" % a + self.__super.meth(a)
C._C__super = super(C)
self.assertEqual(C().meth(3), "C(3)A(3)")
class D(C, B):
def meth(self, a):
return "D(%r)" % a + super(D, self).meth(a)
self.assertEqual(D().meth(4), "D(4)C(4)B(4)A(4)")
# # Test for subclassing super
# class mysuper(super):
# def __init__(self, *args):
# return super(mysuper, self).__init__(*args)
# class E(D):
# def meth(self, a):
# return "E(%r)" % a + mysuper(E, self).meth(a)
# self.assertEqual(E().meth(5), "E(5)D(5)C(5)B(5)A(5)")
# class F(E):
# def meth(self, a):
# s = self.__super # == mysuper(F, self)
# return "F(%r)[%s]" % (a, s.__class__.__name__) + s.meth(a)
# F._F__super = mysuper(F)
# self.assertEqual(F().meth(6), "F(6)[mysuper]E(6)D(6)C(6)B(6)A(6)")
# Make sure certain errors are raised
try:
super(D, 42)
except TypeError:
pass
else:
self.fail("shouldn't allow super(D, 42)")
try:
super(D, C())
except TypeError:
pass
else:
self.fail("shouldn't allow super(D, C())")
try:
super(D).__get__(12)
except TypeError:
pass
else:
self.fail("shouldn't allow super(D).__get__(12)")
try:
super(D).__get__(C())
except TypeError:
pass
else:
self.fail("shouldn't allow super(D).__get__(C())")
# Make sure data descriptors can be overridden and accessed via super
# (new feature in Python 2.3)
class DDbase(object):
def getx(self): return 42
x = property(getx)
class DDsub(DDbase):
def getx(self): return "hello"
x = property(getx)
dd = DDsub()
self.assertEqual(dd.x, "hello")
self.assertEqual(super(DDsub, dd).x, 42)
# Ensure that super() lookup of descriptor from classmethod
# works (SF ID# 743627)
class Base(object):
aProp = property(lambda self: "foo")
class Sub(Base):
@classmethod
def test(klass):
return super(Sub,klass).aProp
self.assertEqual(Sub.test(), Base.aProp)
# Verify that super() doesn't allow keyword args
try:
super(Base, kw=1)
except TypeError:
pass
else:
self.assertEqual("super shouldn't accept keyword args")
if __name__ == "__main__":
unittest.main()