A test suite for the copy module. This should provide full code

coverage.

Lib/test/test_copy.py

+"""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 C(object):
+            def __getattribute__(self, name):
+                if name == "__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, 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 C(object):
+            def __getattribute__(self, name):
+                if name == "__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, 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)
+
+def test_main():
+    suite = unittest.TestSuite()
+    suite.addTest(unittest.makeSuite(TestCopy))
+    test_support.run_suite(suite)
+
+if __name__ == "__main__":
+    test_main()