688 lines
20 KiB
Python
688 lines
20 KiB
Python
"""Unit tests for the copy module."""
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import copy
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import copyreg
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import weakref
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from operator import le, lt, ge, gt, eq, ne
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import unittest
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from test import support
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order_comparisons = le, lt, ge, gt
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equality_comparisons = eq, ne
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comparisons = order_comparisons + equality_comparisons
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class TestCopy(unittest.TestCase):
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# Attempt full line coverage of copy.py from top to bottom
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def test_exceptions(self):
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self.assertTrue(copy.Error is copy.error)
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self.assertTrue(issubclass(copy.Error, Exception))
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# The copy() method
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def test_copy_basic(self):
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x = 42
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y = copy.copy(x)
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self.assertEqual(x, y)
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def test_copy_copy(self):
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class C(object):
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def __init__(self, foo):
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self.foo = foo
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def __copy__(self):
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return C(self.foo)
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x = C(42)
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y = copy.copy(x)
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self.assertEqual(y.__class__, x.__class__)
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self.assertEqual(y.foo, x.foo)
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def test_copy_registry(self):
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class C(object):
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def __new__(cls, foo):
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obj = object.__new__(cls)
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obj.foo = foo
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return obj
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def pickle_C(obj):
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return (C, (obj.foo,))
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x = C(42)
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self.assertRaises(TypeError, copy.copy, x)
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copyreg.pickle(C, pickle_C, C)
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y = copy.copy(x)
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def test_copy_reduce_ex(self):
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class C(object):
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def __reduce_ex__(self, proto):
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return ""
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def __reduce__(self):
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raise support.TestFailed("shouldn't call this")
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x = C()
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y = copy.copy(x)
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self.assertTrue(y is x)
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def test_copy_reduce(self):
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class C(object):
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def __reduce__(self):
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return ""
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x = C()
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y = copy.copy(x)
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self.assertTrue(y is x)
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def test_copy_cant(self):
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class C(object):
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def __getattribute__(self, name):
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if name.startswith("__reduce"):
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raise AttributeError(name)
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return object.__getattribute__(self, name)
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x = C()
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self.assertRaises(copy.Error, copy.copy, x)
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# Type-specific _copy_xxx() methods
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def test_copy_atomic(self):
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class Classic:
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pass
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class NewStyle(object):
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pass
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def f():
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pass
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tests = [None, 42, 2**100, 3.14, True, False, 1j,
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"hello", "hello\u1234", f.__code__,
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NewStyle, range(10), Classic, max]
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for x in tests:
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self.assertTrue(copy.copy(x) is x, repr(x))
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def test_copy_list(self):
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x = [1, 2, 3]
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self.assertEqual(copy.copy(x), x)
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def test_copy_tuple(self):
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x = (1, 2, 3)
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self.assertEqual(copy.copy(x), x)
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def test_copy_dict(self):
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x = {"foo": 1, "bar": 2}
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self.assertEqual(copy.copy(x), x)
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def test_copy_inst_vanilla(self):
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class C:
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def __init__(self, foo):
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self.foo = foo
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def __eq__(self, other):
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return self.foo == other.foo
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x = C(42)
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self.assertEqual(copy.copy(x), x)
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def test_copy_inst_copy(self):
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class C:
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def __init__(self, foo):
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self.foo = foo
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def __copy__(self):
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return C(self.foo)
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def __eq__(self, other):
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return self.foo == other.foo
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x = C(42)
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self.assertEqual(copy.copy(x), x)
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def test_copy_inst_getinitargs(self):
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class C:
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def __init__(self, foo):
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self.foo = foo
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def __getinitargs__(self):
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return (self.foo,)
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def __eq__(self, other):
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return self.foo == other.foo
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x = C(42)
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self.assertEqual(copy.copy(x), x)
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def test_copy_inst_getstate(self):
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class C:
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def __init__(self, foo):
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self.foo = foo
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def __getstate__(self):
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return {"foo": self.foo}
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def __eq__(self, other):
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return self.foo == other.foo
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x = C(42)
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self.assertEqual(copy.copy(x), x)
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def test_copy_inst_setstate(self):
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class C:
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def __init__(self, foo):
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self.foo = foo
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def __setstate__(self, state):
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self.foo = state["foo"]
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def __eq__(self, other):
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return self.foo == other.foo
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x = C(42)
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self.assertEqual(copy.copy(x), x)
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def test_copy_inst_getstate_setstate(self):
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class C:
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def __init__(self, foo):
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self.foo = foo
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def __getstate__(self):
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return self.foo
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def __setstate__(self, state):
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self.foo = state
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def __eq__(self, other):
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return self.foo == other.foo
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x = C(42)
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self.assertEqual(copy.copy(x), x)
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# The deepcopy() method
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def test_deepcopy_basic(self):
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x = 42
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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def test_deepcopy_memo(self):
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# Tests of reflexive objects are under type-specific sections below.
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# This tests only repetitions of objects.
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x = []
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x = [x, x]
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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self.assertTrue(y is not x)
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self.assertTrue(y[0] is not x[0])
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self.assertTrue(y[0] is y[1])
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def test_deepcopy_issubclass(self):
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# XXX Note: there's no way to test the TypeError coming out of
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# issubclass() -- this can only happen when an extension
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# module defines a "type" that doesn't formally inherit from
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# type.
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class Meta(type):
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pass
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class C(metaclass=Meta):
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pass
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self.assertEqual(copy.deepcopy(C), C)
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def test_deepcopy_deepcopy(self):
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class C(object):
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def __init__(self, foo):
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self.foo = foo
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def __deepcopy__(self, memo=None):
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return C(self.foo)
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x = C(42)
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y = copy.deepcopy(x)
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self.assertEqual(y.__class__, x.__class__)
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self.assertEqual(y.foo, x.foo)
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def test_deepcopy_registry(self):
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class C(object):
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def __new__(cls, foo):
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obj = object.__new__(cls)
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obj.foo = foo
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return obj
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def pickle_C(obj):
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return (C, (obj.foo,))
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x = C(42)
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self.assertRaises(TypeError, copy.deepcopy, x)
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copyreg.pickle(C, pickle_C, C)
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y = copy.deepcopy(x)
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def test_deepcopy_reduce_ex(self):
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class C(object):
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def __reduce_ex__(self, proto):
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return ""
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def __reduce__(self):
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raise support.TestFailed("shouldn't call this")
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x = C()
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y = copy.deepcopy(x)
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self.assertTrue(y is x)
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def test_deepcopy_reduce(self):
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class C(object):
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def __reduce__(self):
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return ""
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x = C()
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y = copy.deepcopy(x)
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self.assertTrue(y is x)
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def test_deepcopy_cant(self):
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class C(object):
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def __getattribute__(self, name):
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if name.startswith("__reduce"):
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raise AttributeError(name)
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return object.__getattribute__(self, name)
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x = C()
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self.assertRaises(copy.Error, copy.deepcopy, x)
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# Type-specific _deepcopy_xxx() methods
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def test_deepcopy_atomic(self):
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class Classic:
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pass
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class NewStyle(object):
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pass
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def f():
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pass
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tests = [None, 42, 2**100, 3.14, True, False, 1j,
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"hello", "hello\u1234", f.__code__,
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NewStyle, range(10), Classic, max]
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for x in tests:
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self.assertTrue(copy.deepcopy(x) is x, repr(x))
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def test_deepcopy_list(self):
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x = [[1, 2], 3]
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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self.assertTrue(x is not y)
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self.assertTrue(x[0] is not y[0])
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def test_deepcopy_reflexive_list(self):
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x = []
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x.append(x)
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y = copy.deepcopy(x)
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for op in comparisons:
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self.assertRaises(RuntimeError, op, y, x)
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self.assertTrue(y is not x)
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self.assertTrue(y[0] is y)
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self.assertEqual(len(y), 1)
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def test_deepcopy_tuple(self):
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x = ([1, 2], 3)
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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self.assertTrue(x is not y)
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self.assertTrue(x[0] is not y[0])
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def test_deepcopy_reflexive_tuple(self):
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x = ([],)
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x[0].append(x)
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y = copy.deepcopy(x)
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for op in comparisons:
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self.assertRaises(RuntimeError, op, y, x)
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self.assertTrue(y is not x)
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self.assertTrue(y[0] is not x[0])
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self.assertTrue(y[0][0] is y)
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def test_deepcopy_dict(self):
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x = {"foo": [1, 2], "bar": 3}
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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self.assertTrue(x is not y)
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self.assertTrue(x["foo"] is not y["foo"])
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def test_deepcopy_reflexive_dict(self):
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x = {}
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x['foo'] = x
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y = copy.deepcopy(x)
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for op in order_comparisons:
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self.assertRaises(TypeError, op, y, x)
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for op in equality_comparisons:
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self.assertRaises(RuntimeError, op, y, x)
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self.assertTrue(y is not x)
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self.assertTrue(y['foo'] is y)
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self.assertEqual(len(y), 1)
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def test_deepcopy_keepalive(self):
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memo = {}
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x = 42
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y = copy.deepcopy(x, memo)
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self.assertTrue(memo[id(x)] is x)
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def test_deepcopy_inst_vanilla(self):
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class C:
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def __init__(self, foo):
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self.foo = foo
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def __eq__(self, other):
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return self.foo == other.foo
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x = C([42])
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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self.assertTrue(y.foo is not x.foo)
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def test_deepcopy_inst_deepcopy(self):
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class C:
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def __init__(self, foo):
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self.foo = foo
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def __deepcopy__(self, memo):
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return C(copy.deepcopy(self.foo, memo))
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def __eq__(self, other):
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return self.foo == other.foo
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x = C([42])
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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self.assertTrue(y is not x)
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self.assertTrue(y.foo is not x.foo)
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def test_deepcopy_inst_getinitargs(self):
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class C:
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def __init__(self, foo):
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self.foo = foo
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def __getinitargs__(self):
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return (self.foo,)
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def __eq__(self, other):
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return self.foo == other.foo
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x = C([42])
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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self.assertTrue(y is not x)
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self.assertTrue(y.foo is not x.foo)
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def test_deepcopy_inst_getstate(self):
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class C:
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def __init__(self, foo):
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self.foo = foo
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def __getstate__(self):
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return {"foo": self.foo}
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def __eq__(self, other):
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return self.foo == other.foo
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x = C([42])
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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self.assertTrue(y is not x)
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self.assertTrue(y.foo is not x.foo)
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def test_deepcopy_inst_setstate(self):
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class C:
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def __init__(self, foo):
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self.foo = foo
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def __setstate__(self, state):
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self.foo = state["foo"]
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def __eq__(self, other):
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return self.foo == other.foo
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x = C([42])
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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self.assertTrue(y is not x)
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self.assertTrue(y.foo is not x.foo)
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def test_deepcopy_inst_getstate_setstate(self):
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class C:
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def __init__(self, foo):
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self.foo = foo
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def __getstate__(self):
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return self.foo
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def __setstate__(self, state):
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self.foo = state
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def __eq__(self, other):
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return self.foo == other.foo
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x = C([42])
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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self.assertTrue(y is not x)
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self.assertTrue(y.foo is not x.foo)
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def test_deepcopy_reflexive_inst(self):
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class C:
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pass
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x = C()
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x.foo = x
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y = copy.deepcopy(x)
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self.assertTrue(y is not x)
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self.assertTrue(y.foo is y)
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# _reconstruct()
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def test_reconstruct_string(self):
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class C(object):
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def __reduce__(self):
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return ""
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x = C()
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y = copy.copy(x)
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self.assertTrue(y is x)
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y = copy.deepcopy(x)
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self.assertTrue(y is x)
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def test_reconstruct_nostate(self):
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class C(object):
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def __reduce__(self):
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return (C, ())
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x = C()
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x.foo = 42
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y = copy.copy(x)
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self.assertTrue(y.__class__ is x.__class__)
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y = copy.deepcopy(x)
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self.assertTrue(y.__class__ is x.__class__)
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def test_reconstruct_state(self):
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class C(object):
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def __reduce__(self):
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return (C, (), self.__dict__)
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def __eq__(self, other):
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return self.__dict__ == other.__dict__
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x = C()
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x.foo = [42]
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y = copy.copy(x)
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self.assertEqual(y, x)
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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self.assertTrue(y.foo is not x.foo)
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def test_reconstruct_state_setstate(self):
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class C(object):
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def __reduce__(self):
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return (C, (), self.__dict__)
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def __setstate__(self, state):
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self.__dict__.update(state)
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def __eq__(self, other):
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return self.__dict__ == other.__dict__
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x = C()
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x.foo = [42]
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y = copy.copy(x)
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self.assertEqual(y, x)
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y = copy.deepcopy(x)
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self.assertEqual(y, x)
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self.assertTrue(y.foo is not x.foo)
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def test_reconstruct_reflexive(self):
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class C(object):
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pass
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x = C()
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x.foo = x
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y = copy.deepcopy(x)
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self.assertTrue(y is not x)
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self.assertTrue(y.foo is y)
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# Additions for Python 2.3 and pickle protocol 2
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def test_reduce_4tuple(self):
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class C(list):
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def __reduce__(self):
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return (C, (), self.__dict__, iter(self))
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def __eq__(self, other):
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return (list(self) == list(other) and
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self.__dict__ == other.__dict__)
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x = C([[1, 2], 3])
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y = copy.copy(x)
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self.assertEqual(x, y)
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self.assertTrue(x is not y)
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self.assertTrue(x[0] is y[0])
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y = copy.deepcopy(x)
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self.assertEqual(x, y)
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self.assertTrue(x is not y)
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self.assertTrue(x[0] is not y[0])
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def test_reduce_5tuple(self):
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class C(dict):
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def __reduce__(self):
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return (C, (), self.__dict__, None, self.items())
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def __eq__(self, other):
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return (dict(self) == dict(other) and
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self.__dict__ == other.__dict__)
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x = C([("foo", [1, 2]), ("bar", 3)])
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y = copy.copy(x)
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self.assertEqual(x, y)
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self.assertTrue(x is not y)
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self.assertTrue(x["foo"] is y["foo"])
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y = copy.deepcopy(x)
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self.assertEqual(x, y)
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self.assertTrue(x is not y)
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self.assertTrue(x["foo"] is not y["foo"])
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def test_copy_slots(self):
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class C(object):
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__slots__ = ["foo"]
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x = C()
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x.foo = [42]
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y = copy.copy(x)
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self.assertTrue(x.foo is y.foo)
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def test_deepcopy_slots(self):
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class C(object):
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__slots__ = ["foo"]
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x = C()
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x.foo = [42]
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y = copy.deepcopy(x)
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self.assertEqual(x.foo, y.foo)
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self.assertTrue(x.foo is not y.foo)
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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.assertTrue(x[0] is y[0])
|
|
self.assertTrue(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.assertTrue(x[0] is not y[0])
|
|
self.assertTrue(x.foo is not y.foo)
|
|
|
|
def test_copy_tuple_subclass(self):
|
|
class C(tuple):
|
|
pass
|
|
x = C([1, 2, 3])
|
|
self.assertEqual(tuple(x), (1, 2, 3))
|
|
y = copy.copy(x)
|
|
self.assertEqual(tuple(y), (1, 2, 3))
|
|
|
|
def test_deepcopy_tuple_subclass(self):
|
|
class C(tuple):
|
|
pass
|
|
x = C([[1, 2], 3])
|
|
self.assertEqual(tuple(x), ([1, 2], 3))
|
|
y = copy.deepcopy(x)
|
|
self.assertEqual(tuple(y), ([1, 2], 3))
|
|
self.assertTrue(x is not y)
|
|
self.assertTrue(x[0] is not y[0])
|
|
|
|
def test_getstate_exc(self):
|
|
class EvilState(object):
|
|
def __getstate__(self):
|
|
raise ValueError("ain't got no stickin' state")
|
|
self.assertRaises(ValueError, copy.copy, EvilState())
|
|
|
|
def test_copy_function(self):
|
|
self.assertEqual(copy.copy(global_foo), global_foo)
|
|
def foo(x, y): return x+y
|
|
self.assertEqual(copy.copy(foo), foo)
|
|
bar = lambda: None
|
|
self.assertEqual(copy.copy(bar), bar)
|
|
|
|
def test_deepcopy_function(self):
|
|
self.assertEqual(copy.deepcopy(global_foo), global_foo)
|
|
def foo(x, y): return x+y
|
|
self.assertEqual(copy.deepcopy(foo), foo)
|
|
bar = lambda: None
|
|
self.assertEqual(copy.deepcopy(bar), bar)
|
|
|
|
def _check_weakref(self, _copy):
|
|
class C(object):
|
|
pass
|
|
obj = C()
|
|
x = weakref.ref(obj)
|
|
y = _copy(x)
|
|
self.assertTrue(y is x)
|
|
del obj
|
|
y = _copy(x)
|
|
self.assertTrue(y is x)
|
|
|
|
def test_copy_weakref(self):
|
|
self._check_weakref(copy.copy)
|
|
|
|
def test_deepcopy_weakref(self):
|
|
self._check_weakref(copy.deepcopy)
|
|
|
|
def _check_copy_weakdict(self, _dicttype):
|
|
class C(object):
|
|
pass
|
|
a, b, c, d = [C() for i in range(4)]
|
|
u = _dicttype()
|
|
u[a] = b
|
|
u[c] = d
|
|
v = copy.copy(u)
|
|
self.assertFalse(v is u)
|
|
self.assertEqual(v, u)
|
|
self.assertEqual(v[a], b)
|
|
self.assertEqual(v[c], d)
|
|
self.assertEqual(len(v), 2)
|
|
del c, d
|
|
self.assertEqual(len(v), 1)
|
|
x, y = C(), C()
|
|
# The underlying containers are decoupled
|
|
v[x] = y
|
|
self.assertFalse(x in u)
|
|
|
|
def test_copy_weakkeydict(self):
|
|
self._check_copy_weakdict(weakref.WeakKeyDictionary)
|
|
|
|
def test_copy_weakvaluedict(self):
|
|
self._check_copy_weakdict(weakref.WeakValueDictionary)
|
|
|
|
def test_deepcopy_weakkeydict(self):
|
|
class C(object):
|
|
def __init__(self, i):
|
|
self.i = i
|
|
a, b, c, d = [C(i) for i in range(4)]
|
|
u = weakref.WeakKeyDictionary()
|
|
u[a] = b
|
|
u[c] = d
|
|
# Keys aren't copied, values are
|
|
v = copy.deepcopy(u)
|
|
self.assertNotEqual(v, u)
|
|
self.assertEqual(len(v), 2)
|
|
self.assertFalse(v[a] is b)
|
|
self.assertFalse(v[c] is d)
|
|
self.assertEqual(v[a].i, b.i)
|
|
self.assertEqual(v[c].i, d.i)
|
|
del c
|
|
self.assertEqual(len(v), 1)
|
|
|
|
def test_deepcopy_weakvaluedict(self):
|
|
class C(object):
|
|
def __init__(self, i):
|
|
self.i = i
|
|
a, b, c, d = [C(i) for i in range(4)]
|
|
u = weakref.WeakValueDictionary()
|
|
u[a] = b
|
|
u[c] = d
|
|
# Keys are copied, values aren't
|
|
v = copy.deepcopy(u)
|
|
self.assertNotEqual(v, u)
|
|
self.assertEqual(len(v), 2)
|
|
(x, y), (z, t) = sorted(v.items(), key=lambda pair: pair[0].i)
|
|
self.assertFalse(x is a)
|
|
self.assertEqual(x.i, a.i)
|
|
self.assertTrue(y is b)
|
|
self.assertFalse(z is c)
|
|
self.assertEqual(z.i, c.i)
|
|
self.assertTrue(t is d)
|
|
del x, y, z, t
|
|
del d
|
|
self.assertEqual(len(v), 1)
|
|
|
|
|
|
def global_foo(x, y): return x+y
|
|
|
|
def test_main():
|
|
support.run_unittest(TestCopy)
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|