def test_dictproxy(self):
v = {}
x = MutableMappingProxy(lambda: v)
x['foo'] = 42
assert x['foo'] == 42
assert len(x) == 1
assert 'foo' in x
del (x['foo'])
with pytest.raises(KeyError):
x['foo']
assert iter(x)
def test_dictproxy(self):
v = {}
x = MutableMappingProxy(lambda: v)
x["foo"] = 42
assert x["foo"] == 42
assert len(x) == 1
assert "foo" in x
del x["foo"]
with pytest.raises(KeyError):
x["foo"]
assert iter(x)
def s(self, *, orig):
return MutableMappingProxy(lambda: orig)