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"""Unit tests for the copy module."""
import sys
import copy
import unittest
from test import test_support
class TestCopy(unittest.TestCase):
# Attempt full line coverage of copy.py from top to bottom
def test_exceptions(self):
self.assert_(copy.Error is copy.error)
self.assert_(issubclass(copy.Error, Exception))
# The copy() method
def test_copy_basic(self):
x = 42
y = copy.copy(x)
self.assertEqual(x, y)
def test_copy_copy(self):
class C(object):
def __init__(self, foo):
self.foo = foo
def __copy__(self):
return C(self.foo)
x = C(42)
y = copy.copy(x)
self.assertEqual(y.__class__, x.__class__)
self.assertEqual(y.foo, x.foo)
def test_copy_reduce(self):
class C(object):
def __reduce__(self):
return ""
x = C()
y = copy.copy(x)
self.assert_(y is x)
def test_copy_cant(self):
class Meta(type):
def __getattribute__(self, name):
if name == "__reduce__":
raise AttributeError, name
return object.__getattribute__(self, name)
class C:
__metaclass__ = Meta
x = C()
self.assertRaises(copy.Error, copy.copy, x)
# Type-specific _copy_xxx() methods
def test_copy_atomic(self):
class Classic:
pass
class NewStyle(object):
pass
def f():
pass
tests = [None, 42, 2L**100, 3.14, True, False, 1j,
"hello", u"hello\u1234", f.func_code,
NewStyle, xrange(10), Classic]
for x in tests:
self.assert_(copy.copy(x) is x, `x`)
def test_copy_list(self):
x = [1, 2, 3]
self.assertEqual(copy.copy(x), x)
def test_copy_tuple(self):
x = (1, 2, 3)
self.assertEqual(copy.copy(x), x)
def test_copy_dict(self):
x = {"foo": 1, "bar": 2}
self.assertEqual(copy.copy(x), x)
def test_copy_inst_vanilla(self):
class C:
def __init__(self, foo):
self.foo = foo
def __cmp__(self, other):
return cmp(self.foo, other.foo)
x = C(42)
self.assertEqual(copy.copy(x), x)
def test_copy_inst_copy(self):
class C:
def __init__(self, foo):
self.foo = foo
def __copy__(self):
return C(self.foo)
def __cmp__(self, other):
return cmp(self.foo, other.foo)
x = C(42)
self.assertEqual(copy.copy(x), x)
def test_copy_inst_getinitargs(self):
class C:
def __init__(self, foo):
self.foo = foo
def __getinitargs__(self):
return (self.foo,)
def __cmp__(self, other):
return cmp(self.foo, other.foo)
x = C(42)
self.assertEqual(copy.copy(x), x)
def test_copy_inst_getstate(self):
class C:
def __init__(self, foo):
self.foo = foo
def __getstate__(self):
return {"foo": self.foo}
def __cmp__(self, other):
return cmp(self.foo, other.foo)
x = C(42)
self.assertEqual(copy.copy(x), x)
def test_copy_inst_setstate(self):
class C:
def __init__(self, foo):
self.foo = foo
def __setstate__(self, state):
self.foo = state["foo"]
def __cmp__(self, other):
return cmp(self.foo, other.foo)
x = C(42)
self.assertEqual(copy.copy(x), x)
def test_copy_inst_getstate_setstate(self):
class C:
def __init__(self, foo):
self.foo = foo
def __getstate__(self):
return self.foo
def __setstate__(self, state):
self.foo = state
def __cmp__(self, other):
return cmp(self.foo, other.foo)
x = C(42)
self.assertEqual(copy.copy(x), x)
# The deepcopy() method
def test_deepcopy_basic(self):
x = 42
y = copy.deepcopy(x)
self.assertEqual(y, x)
def test_deepcopy_memo(self):
x = []
x.append(x)
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assert_(y is not x)
self.assert_(y[0] is not x[0])
self.assert_(y is y[0])
def test_deepcopy_issubclass(self):
# XXX Note: there's no way to test the TypeError coming out of
# issubclass() -- this can only happen when an extension
# module defines a "type" that doesn't formally inherit from
# type.
class Meta(type):
pass
class C:
__metaclass__ = Meta
self.assertEqual(copy.deepcopy(C), C)
def test_deepcopy_deepcopy(self):
class C(object):
def __init__(self, foo):
self.foo = foo
def __deepcopy__(self, memo=None):
return C(self.foo)
x = C(42)
y = copy.deepcopy(x)
self.assertEqual(y.__class__, x.__class__)
self.assertEqual(y.foo, x.foo)
def test_deepcopy_reduce(self):
class C(object):
def __reduce__(self):
return ""
x = C()
y = copy.deepcopy(x)
self.assert_(y is x)
def test_deepcopy_cant(self):
class Meta(type):
def __getattribute__(self, name):
if name == "__reduce__":
raise AttributeError, name
return object.__getattribute__(self, name)
class C:
__metaclass__ = Meta
x = C()
self.assertRaises(copy.Error, copy.deepcopy, x)
# Type-specific _deepcopy_xxx() methods
def test_deepcopy_atomic(self):
class Classic:
pass
class NewStyle(object):
pass
def f():
pass
tests = [None, 42, 2L**100, 3.14, True, False, 1j,
"hello", u"hello\u1234", f.func_code,
NewStyle, xrange(10)]
for x in tests:
self.assert_(copy.deepcopy(x) is x, `x`)
def test_deepcopy_list(self):
x = [[1, 2], 3]
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assert_(x is not y)
self.assert_(x[0] is not y[0])
def test_deepcopy_tuple(self):
x = ([1, 2], 3)
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assert_(x is not y)
self.assert_(x[0] is not y[0])
def test_deepcopy_dict(self):
x = {"foo": [1, 2], "bar": 3}
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assert_(x is not y)
self.assert_(x["foo"] is not y["foo"])
def test_deepcopy_keepalive(self):
memo = {}
x = 42
y = copy.deepcopy(x, memo)
self.assert_(memo[id(x)] is x)
def test_deepcopy_inst_vanilla(self):
class C:
def __init__(self, foo):
self.foo = foo
def __cmp__(self, other):
return cmp(self.foo, other.foo)
x = C([42])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assert_(y.foo is not x.foo)
def test_deepcopy_inst_deepcopy(self):
class C:
def __init__(self, foo):
self.foo = foo
def __deepcopy__(self, memo):
return C(copy.deepcopy(self.foo, memo))
def __cmp__(self, other):
return cmp(self.foo, other.foo)
x = C([42])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assert_(y is not x)
self.assert_(y.foo is not x.foo)
def test_deepcopy_inst_getinitargs(self):
class C:
def __init__(self, foo):
self.foo = foo
def __getinitargs__(self):
return (self.foo,)
def __cmp__(self, other):
return cmp(self.foo, other.foo)
x = C([42])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assert_(y is not x)
self.assert_(y.foo is not x.foo)
def test_deepcopy_inst_getstate(self):
class C:
def __init__(self, foo):
self.foo = foo
def __getstate__(self):
return {"foo": self.foo}
def __cmp__(self, other):
return cmp(self.foo, other.foo)
x = C([42])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assert_(y is not x)
self.assert_(y.foo is not x.foo)
def test_deepcopy_inst_setstate(self):
class C:
def __init__(self, foo):
self.foo = foo
def __setstate__(self, state):
self.foo = state["foo"]
def __cmp__(self, other):
return cmp(self.foo, other.foo)
x = C([42])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assert_(y is not x)
self.assert_(y.foo is not x.foo)
def test_deepcopy_inst_getstate_setstate(self):
class C:
def __init__(self, foo):
self.foo = foo
def __getstate__(self):
return self.foo
def __setstate__(self, state):
self.foo = state
def __cmp__(self, other):
return cmp(self.foo, other.foo)
x = C([42])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assert_(y is not x)
self.assert_(y.foo is not x.foo)
# _reconstruct()
def test_reconstruct_string(self):
class C(object):
def __reduce__(self):
return ""
x = C()
y = copy.copy(x)
self.assert_(y is x)
y = copy.deepcopy(x)
self.assert_(y is x)
def test_reconstruct_nostate(self):
class C(object):
def __reduce__(self):
return (C, ())
x = C()
x.foo = 42
y = copy.copy(x)
self.assert_(y.__class__ is x.__class__)
y = copy.deepcopy(x)
self.assert_(y.__class__ is x.__class__)
def test_reconstruct_state(self):
class C(object):
def __reduce__(self):
return (C, (), self.__dict__)
def __cmp__(self, other):
return cmp(self.__dict__, other.__dict__)
x = C()
x.foo = [42]
y = copy.copy(x)
self.assertEqual(y, x)
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assert_(y.foo is not x.foo)
def test_reconstruct_state_setstate(self):
class C(object):
def __reduce__(self):
return (C, (), self.__dict__)
def __setstate__(self, state):
self.__dict__.update(state)
def __cmp__(self, other):
return cmp(self.__dict__, other.__dict__)
x = C()
x.foo = [42]
y = copy.copy(x)
self.assertEqual(y, x)
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assert_(y.foo is not x.foo)
# Additions for Python 2.3 and pickle protocol 2
def test_reduce_4tuple(self):
class C(list):
def __reduce__(self):
return (C, (), self.__dict__, iter(self))
def __cmp__(self, other):
return (cmp(list(self), list(other)) or
cmp(self.__dict__, other.__dict__))
x = C([[1, 2], 3])
y = copy.copy(x)
self.assertEqual(x, y)
self.assert_(x is not y)
self.assert_(x[0] is y[0])
y = copy.deepcopy(x)
self.assertEqual(x, y)
self.assert_(x is not y)
self.assert_(x[0] is not y[0])
def test_reduce_5tuple(self):
class C(dict):
def __reduce__(self):
return (C, (), self.__dict__, None, self.iteritems())
def __cmp__(self, other):
return (cmp(dict(self), list(dict)) or
cmp(self.__dict__, other.__dict__))
x = C([("foo", [1, 2]), ("bar", 3)])
y = copy.copy(x)
self.assertEqual(x, y)
self.assert_(x is not y)
self.assert_(x["foo"] is y["foo"])
y = copy.deepcopy(x)
self.assertEqual(x, y)
self.assert_(x is not y)
self.assert_(x["foo"] is not y["foo"])
def test_copy_slots(self):
class C(object):
__slots__ = ["foo"]
x = C()
x.foo = [42]
y = copy.copy(x)
self.assert_(x.foo is y.foo)
def test_deepcopy_slots(self):
class C(object):
__slots__ = ["foo"]
x = C()
x.foo = [42]
y = copy.deepcopy(x)
self.assertEqual(x.foo, y.foo)
self.assert_(x.foo is not y.foo)
def test_copy_list_subclass(self):
class C(list):
pass
x = C([[1, 2], 3])
x.foo = [4, 5]
y = copy.copy(x)
self.assertEqual(list(x), list(y))
self.assertEqual(x.foo, y.foo)
self.assert_(x[0] is y[0])
self.assert_(x.foo is y.foo)
def test_deepcopy_list_subclass(self):
class C(list):
pass
x = C([[1, 2], 3])
x.foo = [4, 5]
y = copy.deepcopy(x)
self.assertEqual(list(x), list(y))
self.assertEqual(x.foo, y.foo)
self.assert_(x[0] is not y[0])
self.assert_(x.foo is not y.foo)
def test_main():
suite = unittest.TestSuite()
suite.addTest(unittest.makeSuite(TestCopy))
test_support.run_suite(suite)
if __name__ == "__main__":
test_main()
|
