| """Unit tests for the copy module.""" |
| |
| import copy |
| import copyreg |
| import weakref |
| from operator import le, lt, ge, gt, eq, ne |
| |
| import unittest |
| from test import support |
| |
| order_comparisons = le, lt, ge, gt |
| equality_comparisons = eq, ne |
| comparisons = order_comparisons + equality_comparisons |
| |
| class TestCopy(unittest.TestCase): |
| |
| # Attempt full line coverage of copy.py from top to bottom |
| |
| def test_exceptions(self): |
| self.assertTrue(copy.Error is copy.error) |
| self.assertTrue(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_registry(self): |
| class C(object): |
| def __new__(cls, foo): |
| obj = object.__new__(cls) |
| obj.foo = foo |
| return obj |
| def pickle_C(obj): |
| return (C, (obj.foo,)) |
| x = C(42) |
| self.assertRaises(TypeError, copy.copy, x) |
| copyreg.pickle(C, pickle_C, C) |
| y = copy.copy(x) |
| |
| def test_copy_reduce_ex(self): |
| class C(object): |
| def __reduce_ex__(self, proto): |
| return "" |
| def __reduce__(self): |
| raise support.TestFailed("shouldn't call this") |
| x = C() |
| y = copy.copy(x) |
| self.assertTrue(y is x) |
| |
| def test_copy_reduce(self): |
| class C(object): |
| def __reduce__(self): |
| return "" |
| x = C() |
| y = copy.copy(x) |
| self.assertTrue(y is x) |
| |
| def test_copy_cant(self): |
| class C(object): |
| def __getattribute__(self, name): |
| if name.startswith("__reduce"): |
| raise AttributeError(name) |
| return object.__getattribute__(self, name) |
| 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, 2**100, 3.14, True, False, 1j, |
| "hello", "hello\u1234", f.__code__, |
| NewStyle, range(10), Classic, max] |
| for x in tests: |
| self.assertTrue(copy.copy(x) is x, repr(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 __eq__(self, other): |
| return 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 __eq__(self, other): |
| return 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 __eq__(self, other): |
| return 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 __eq__(self, other): |
| return 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 __eq__(self, other): |
| return 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 __eq__(self, other): |
| return 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): |
| # Tests of reflexive objects are under type-specific sections below. |
| # This tests only repetitions of objects. |
| x = [] |
| x = [x, x] |
| y = copy.deepcopy(x) |
| self.assertEqual(y, x) |
| self.assertTrue(y is not x) |
| self.assertTrue(y[0] is not x[0]) |
| self.assertTrue(y[0] is y[1]) |
| |
| 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): |
| pass |
| 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_registry(self): |
| class C(object): |
| def __new__(cls, foo): |
| obj = object.__new__(cls) |
| obj.foo = foo |
| return obj |
| def pickle_C(obj): |
| return (C, (obj.foo,)) |
| x = C(42) |
| self.assertRaises(TypeError, copy.deepcopy, x) |
| copyreg.pickle(C, pickle_C, C) |
| y = copy.deepcopy(x) |
| |
| def test_deepcopy_reduce_ex(self): |
| class C(object): |
| def __reduce_ex__(self, proto): |
| return "" |
| def __reduce__(self): |
| raise support.TestFailed("shouldn't call this") |
| x = C() |
| y = copy.deepcopy(x) |
| self.assertTrue(y is x) |
| |
| def test_deepcopy_reduce(self): |
| class C(object): |
| def __reduce__(self): |
| return "" |
| x = C() |
| y = copy.deepcopy(x) |
| self.assertTrue(y is x) |
| |
| def test_deepcopy_cant(self): |
| class C(object): |
| def __getattribute__(self, name): |
| if name.startswith("__reduce"): |
| raise AttributeError(name) |
| return object.__getattribute__(self, name) |
| 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, 2**100, 3.14, True, False, 1j, |
| "hello", "hello\u1234", f.__code__, |
| NewStyle, range(10), Classic, max] |
| for x in tests: |
| self.assertTrue(copy.deepcopy(x) is x, repr(x)) |
| |
| def test_deepcopy_list(self): |
| x = [[1, 2], 3] |
| y = copy.deepcopy(x) |
| self.assertEqual(y, x) |
| self.assertTrue(x is not y) |
| self.assertTrue(x[0] is not y[0]) |
| |
| def test_deepcopy_reflexive_list(self): |
| x = [] |
| x.append(x) |
| y = copy.deepcopy(x) |
| for op in comparisons: |
| self.assertRaises(RuntimeError, op, y, x) |
| self.assertTrue(y is not x) |
| self.assertTrue(y[0] is y) |
| self.assertEqual(len(y), 1) |
| |
| def test_deepcopy_tuple(self): |
| x = ([1, 2], 3) |
| y = copy.deepcopy(x) |
| self.assertEqual(y, x) |
| self.assertTrue(x is not y) |
| self.assertTrue(x[0] is not y[0]) |
| |
| def test_deepcopy_reflexive_tuple(self): |
| x = ([],) |
| x[0].append(x) |
| y = copy.deepcopy(x) |
| for op in comparisons: |
| self.assertRaises(RuntimeError, op, y, x) |
| self.assertTrue(y is not x) |
| self.assertTrue(y[0] is not x[0]) |
| self.assertTrue(y[0][0] is y) |
| |
| def test_deepcopy_dict(self): |
| x = {"foo": [1, 2], "bar": 3} |
| y = copy.deepcopy(x) |
| self.assertEqual(y, x) |
| self.assertTrue(x is not y) |
| self.assertTrue(x["foo"] is not y["foo"]) |
| |
| def test_deepcopy_reflexive_dict(self): |
| x = {} |
| x['foo'] = x |
| y = copy.deepcopy(x) |
| for op in order_comparisons: |
| self.assertRaises(TypeError, op, y, x) |
| for op in equality_comparisons: |
| self.assertRaises(RuntimeError, op, y, x) |
| self.assertTrue(y is not x) |
| self.assertTrue(y['foo'] is y) |
| self.assertEqual(len(y), 1) |
| |
| def test_deepcopy_keepalive(self): |
| memo = {} |
| x = 42 |
| y = copy.deepcopy(x, memo) |
| self.assertTrue(memo[id(x)] is x) |
| |
| def test_deepcopy_inst_vanilla(self): |
| class C: |
| def __init__(self, foo): |
| self.foo = foo |
| def __eq__(self, other): |
| return self.foo == other.foo |
| x = C([42]) |
| y = copy.deepcopy(x) |
| self.assertEqual(y, x) |
| self.assertTrue(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 __eq__(self, other): |
| return self.foo == other.foo |
| x = C([42]) |
| y = copy.deepcopy(x) |
| self.assertEqual(y, x) |
| self.assertTrue(y is not x) |
| self.assertTrue(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 __eq__(self, other): |
| return self.foo == other.foo |
| x = C([42]) |
| y = copy.deepcopy(x) |
| self.assertEqual(y, x) |
| self.assertTrue(y is not x) |
| self.assertTrue(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 __eq__(self, other): |
| return self.foo == other.foo |
| x = C([42]) |
| y = copy.deepcopy(x) |
| self.assertEqual(y, x) |
| self.assertTrue(y is not x) |
| self.assertTrue(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 __eq__(self, other): |
| return self.foo == other.foo |
| x = C([42]) |
| y = copy.deepcopy(x) |
| self.assertEqual(y, x) |
| self.assertTrue(y is not x) |
| self.assertTrue(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 __eq__(self, other): |
| return self.foo == other.foo |
| x = C([42]) |
| y = copy.deepcopy(x) |
| self.assertEqual(y, x) |
| self.assertTrue(y is not x) |
| self.assertTrue(y.foo is not x.foo) |
| |
| def test_deepcopy_reflexive_inst(self): |
| class C: |
| pass |
| x = C() |
| x.foo = x |
| y = copy.deepcopy(x) |
| self.assertTrue(y is not x) |
| self.assertTrue(y.foo is y) |
| |
| # _reconstruct() |
| |
| def test_reconstruct_string(self): |
| class C(object): |
| def __reduce__(self): |
| return "" |
| x = C() |
| y = copy.copy(x) |
| self.assertTrue(y is x) |
| y = copy.deepcopy(x) |
| self.assertTrue(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.assertTrue(y.__class__ is x.__class__) |
| y = copy.deepcopy(x) |
| self.assertTrue(y.__class__ is x.__class__) |
| |
| def test_reconstruct_state(self): |
| class C(object): |
| def __reduce__(self): |
| return (C, (), self.__dict__) |
| def __eq__(self, other): |
| return 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.assertTrue(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 __eq__(self, other): |
| return 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.assertTrue(y.foo is not x.foo) |
| |
| def test_reconstruct_reflexive(self): |
| class C(object): |
| pass |
| x = C() |
| x.foo = x |
| y = copy.deepcopy(x) |
| self.assertTrue(y is not x) |
| self.assertTrue(y.foo is y) |
| |
| # 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 __eq__(self, other): |
| return (list(self) == list(other) and |
| self.__dict__ == other.__dict__) |
| x = C([[1, 2], 3]) |
| y = copy.copy(x) |
| self.assertEqual(x, y) |
| self.assertTrue(x is not y) |
| self.assertTrue(x[0] is y[0]) |
| y = copy.deepcopy(x) |
| self.assertEqual(x, y) |
| self.assertTrue(x is not y) |
| self.assertTrue(x[0] is not y[0]) |
| |
| def test_reduce_5tuple(self): |
| class C(dict): |
| def __reduce__(self): |
| return (C, (), self.__dict__, None, self.items()) |
| def __eq__(self, other): |
| return (dict(self) == dict(other) and |
| self.__dict__ == other.__dict__) |
| x = C([("foo", [1, 2]), ("bar", 3)]) |
| y = copy.copy(x) |
| self.assertEqual(x, y) |
| self.assertTrue(x is not y) |
| self.assertTrue(x["foo"] is y["foo"]) |
| y = copy.deepcopy(x) |
| self.assertEqual(x, y) |
| self.assertTrue(x is not y) |
| self.assertTrue(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.assertTrue(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.assertTrue(x.foo is not y.foo) |
| |
| def test_deepcopy_dict_subclass(self): |
| class C(dict): |
| def __init__(self, d=None): |
| if not d: |
| d = {} |
| self._keys = list(d.keys()) |
| super().__init__(d) |
| def __setitem__(self, key, item): |
| super().__setitem__(key, item) |
| if key not in self._keys: |
| self._keys.append(key) |
| x = C(d={'foo':0}) |
| y = copy.deepcopy(x) |
| self.assertEqual(x, y) |
| self.assertEqual(x._keys, y._keys) |
| self.assertTrue(x is not y) |
| x['bar'] = 1 |
| self.assertNotEqual(x, y) |
| self.assertNotEqual(x._keys, y._keys) |
| |
| 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.assertNotIn(x, 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 test_deepcopy_bound_method(self): |
| class Foo(object): |
| def m(self): |
| pass |
| f = Foo() |
| f.b = f.m |
| g = copy.deepcopy(f) |
| self.assertEqual(g.m, g.b) |
| self.assertTrue(g.b.__self__ is g) |
| g.b() |
| |
| |
| def global_foo(x, y): return x+y |
| |
| def test_main(): |
| support.run_unittest(TestCopy) |
| |
| if __name__ == "__main__": |
| test_main() |