Add test_userdict from CPython 3.8

Author: fanninpm

Lib/test/test_userdict.py

@@ -0,0 +1,220 @@
+# Check every path through every method of UserDict
+
+from test import mapping_tests
+import unittest
+import collections
+
+d0 = {}
+d1 = {"one": 1}
+d2 = {"one": 1, "two": 2}
+d3 = {"one": 1, "two": 3, "three": 5}
+d4 = {"one": None, "two": None}
+d5 = {"one": 1, "two": 1}
+
+class UserDictTest(mapping_tests.TestHashMappingProtocol):
+    type2test = collections.UserDict
+
+    def test_all(self):
+        # Test constructors
+        u = collections.UserDict()
+        u0 = collections.UserDict(d0)
+        u1 = collections.UserDict(d1)
+        u2 = collections.UserDict(d2)
+
+        uu = collections.UserDict(u)
+        uu0 = collections.UserDict(u0)
+        uu1 = collections.UserDict(u1)
+        uu2 = collections.UserDict(u2)
+
+        # keyword arg constructor
+        self.assertEqual(collections.UserDict(one=1, two=2), d2)
+        # item sequence constructor
+        self.assertEqual(collections.UserDict([('one',1), ('two',2)]), d2)
+        with self.assertWarnsRegex(DeprecationWarning, "'dict'"):
+            self.assertEqual(collections.UserDict(dict=[('one',1), ('two',2)]), d2)
+        # both together
+        self.assertEqual(collections.UserDict([('one',1), ('two',2)], two=3, three=5), d3)
+
+        # alternate constructor
+        self.assertEqual(collections.UserDict.fromkeys('one two'.split()), d4)
+        self.assertEqual(collections.UserDict().fromkeys('one two'.split()), d4)
+        self.assertEqual(collections.UserDict.fromkeys('one two'.split(), 1), d5)
+        self.assertEqual(collections.UserDict().fromkeys('one two'.split(), 1), d5)
+        self.assertTrue(u1.fromkeys('one two'.split()) is not u1)
+        self.assertIsInstance(u1.fromkeys('one two'.split()), collections.UserDict)
+        self.assertIsInstance(u2.fromkeys('one two'.split()), collections.UserDict)
+
+        # Test __repr__
+        self.assertEqual(str(u0), str(d0))
+        self.assertEqual(repr(u1), repr(d1))
+        self.assertIn(repr(u2), ("{'one': 1, 'two': 2}",
+                                 "{'two': 2, 'one': 1}"))
+
+        # Test rich comparison and __len__
+        all = [d0, d1, d2, u, u0, u1, u2, uu, uu0, uu1, uu2]
+        for a in all:
+            for b in all:
+                self.assertEqual(a == b, len(a) == len(b))
+
+        # Test __getitem__
+        self.assertEqual(u2["one"], 1)
+        self.assertRaises(KeyError, u1.__getitem__, "two")
+
+        # Test __setitem__
+        u3 = collections.UserDict(u2)
+        u3["two"] = 2
+        u3["three"] = 3
+
+        # Test __delitem__
+        del u3["three"]
+        self.assertRaises(KeyError, u3.__delitem__, "three")
+
+        # Test clear
+        u3.clear()
+        self.assertEqual(u3, {})
+
+        # Test copy()
+        u2a = u2.copy()
+        self.assertEqual(u2a, u2)
+        u2b = collections.UserDict(x=42, y=23)
+        u2c = u2b.copy() # making a copy of a UserDict is special cased
+        self.assertEqual(u2b, u2c)
+
+        class MyUserDict(collections.UserDict):
+            def display(self): print(self)
+
+        m2 = MyUserDict(u2)
+        m2a = m2.copy()
+        self.assertEqual(m2a, m2)
+
+        # SF bug #476616 -- copy() of UserDict subclass shared data
+        m2['foo'] = 'bar'
+        self.assertNotEqual(m2a, m2)
+
+        # Test keys, items, values
+        self.assertEqual(sorted(u2.keys()), sorted(d2.keys()))
+        self.assertEqual(sorted(u2.items()), sorted(d2.items()))
+        self.assertEqual(sorted(u2.values()), sorted(d2.values()))
+
+        # Test "in".
+        for i in u2.keys():
+            self.assertIn(i, u2)
+            self.assertEqual(i in u1, i in d1)
+            self.assertEqual(i in u0, i in d0)
+
+        # Test update
+        t = collections.UserDict()
+        t.update(u2)
+        self.assertEqual(t, u2)
+
+        # Test get
+        for i in u2.keys():
+            self.assertEqual(u2.get(i), u2[i])
+            self.assertEqual(u1.get(i), d1.get(i))
+            self.assertEqual(u0.get(i), d0.get(i))
+
+        # Test "in" iteration.
+        for i in range(20):
+            u2[i] = str(i)
+        ikeys = []
+        for k in u2:
+            ikeys.append(k)
+        keys = u2.keys()
+        self.assertEqual(set(ikeys), set(keys))
+
+        # Test setdefault
+        t = collections.UserDict()
+        self.assertEqual(t.setdefault("x", 42), 42)
+        self.assertIn("x", t)
+        self.assertEqual(t.setdefault("x", 23), 42)
+
+        # Test pop
+        t = collections.UserDict(x=42)
+        self.assertEqual(t.pop("x"), 42)
+        self.assertRaises(KeyError, t.pop, "x")
+        self.assertEqual(t.pop("x", 1), 1)
+        t["x"] = 42
+        self.assertEqual(t.pop("x", 1), 42)
+
+        # Test popitem
+        t = collections.UserDict(x=42)
+        self.assertEqual(t.popitem(), ("x", 42))
+        self.assertRaises(KeyError, t.popitem)
+
+    def test_init(self):
+        for kw in 'self', 'other', 'iterable':
+            self.assertEqual(list(collections.UserDict(**{kw: 42}).items()),
+                             [(kw, 42)])
+        self.assertEqual(list(collections.UserDict({}, dict=42).items()),
+                         [('dict', 42)])
+        self.assertEqual(list(collections.UserDict({}, dict=None).items()),
+                         [('dict', None)])
+        with self.assertWarnsRegex(DeprecationWarning, "'dict'"):
+            self.assertEqual(list(collections.UserDict(dict={'a': 42}).items()),
+                             [('a', 42)])
+        self.assertRaises(TypeError, collections.UserDict, 42)
+        self.assertRaises(TypeError, collections.UserDict, (), ())
+        self.assertRaises(TypeError, collections.UserDict.__init__)
+
+    def test_update(self):
+        for kw in 'self', 'dict', 'other', 'iterable':
+            d = collections.UserDict()
+            d.update(**{kw: 42})
+            self.assertEqual(list(d.items()), [(kw, 42)])
+        self.assertRaises(TypeError, collections.UserDict().update, 42)
+        self.assertRaises(TypeError, collections.UserDict().update, {}, {})
+        self.assertRaises(TypeError, collections.UserDict.update)
+
+    def test_missing(self):
+        # Make sure UserDict doesn't have a __missing__ method
+        self.assertEqual(hasattr(collections.UserDict, "__missing__"), False)
+        # Test several cases:
+        # (D) subclass defines __missing__ method returning a value
+        # (E) subclass defines __missing__ method raising RuntimeError
+        # (F) subclass sets __missing__ instance variable (no effect)
+        # (G) subclass doesn't define __missing__ at all
+        class D(collections.UserDict):
+            def __missing__(self, key):
+                return 42
+        d = D({1: 2, 3: 4})
+        self.assertEqual(d[1], 2)
+        self.assertEqual(d[3], 4)
+        self.assertNotIn(2, d)
+        self.assertNotIn(2, d.keys())
+        self.assertEqual(d[2], 42)
+        class E(collections.UserDict):
+            def __missing__(self, key):
+                raise RuntimeError(key)
+        e = E()
+        try:
+            e[42]
+        except RuntimeError as err:
+            self.assertEqual(err.args, (42,))
+        else:
+            self.fail("e[42] didn't raise RuntimeError")
+        class F(collections.UserDict):
+            def __init__(self):
+                # An instance variable __missing__ should have no effect
+                self.__missing__ = lambda key: None
+                collections.UserDict.__init__(self)
+        f = F()
+        try:
+            f[42]
+        except KeyError as err:
+            self.assertEqual(err.args, (42,))
+        else:
+            self.fail("f[42] didn't raise KeyError")
+        class G(collections.UserDict):
+            pass
+        g = G()
+        try:
+            g[42]
+        except KeyError as err:
+            self.assertEqual(err.args, (42,))
+        else:
+            self.fail("g[42] didn't raise KeyError")
+
+
+
+if __name__ == "__main__":
+    unittest.main()