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# Check every path through every method of UserDict
from test import support, mapping_tests
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)
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.assertEqual(repr(u2), repr(d2))
# 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(u2.keys(), d2.keys())
self.assertEqual(u2.items(), d2.items())
self.assertEqual(list(u2.values()), list(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_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 a 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")
def test_main():
support.run_unittest(
UserDictTest,
)
if __name__ == "__main__":
test_main()
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