def for_various_result_types_of__filter_by_which(test_meth):
# Taking into consideration that the data specification's
# overridable method `filter_by_which()` is required to return a
# container that is either a *dict items view* or a *set-like*
# object, we want to ensure that the methods which call
# `filter_by_which()` handle the call results properly for various
# types of these results (i.e., regardless of whether the result is
# a *dict items view* or a *set-like* object; regardless of whether
# the object is an instance of a builtin type or of a custom one;
# and regardless of whether the object is mutable or immutable...).
#
# By wrapping with this decorator a test of a data specification's
# method which uses `filter_by_which()` call results *and* by
# decorating the test case class that contains such a test with
# `@unittest_expander.expand` -- we ensure that the method will be
# tested for various kinds of types of `filter_by_which()` call
# results.
@foreach([
None,
lambda iterable: dict(iterable).viewitems(),
lambda iterable: collections.ItemsView(dict(iterable)),
frozenset,
set,
CustomImmutableSet,
CustomMutableSet,
])
@functools.wraps(test_meth)
def decorated_test_meth(self, result_type_adjuster):
if result_type_adjuster is None:
test_meth(self)
return
called = []
wrapped = _make_wrapped__filter_by_which(
result_type_adjuster,
called,
orig=self.base_data_spec_class.filter_by_which)
with patch.object(self.base_data_spec_class, 'filter_by_which',
wrapped):
assert not called, 'bug in the test'
test_meth(self)
assert called, 'bug in the test'
def _make_wrapped__filter_by_which(result_type_adjuster, called, orig):
@staticmethod
def wrapped(*args, **kwargs):
called.append(None)
orig_result = orig(*args, **kwargs)
return result_type_adjuster(orig_result)
return wrapped
return decorated_test_meth
def iteritems(self):
return collections.ItemsView(self.mapping)
def viewitems(self):
return collections.ItemsView(self)
import collections
device = {"hostname":"falcon"}
print(device)
device['vendor'] = 'nokia'
print(device)
device['model'] = '7750'
print(device)
device.setdefault('type', 'SR12')
print(device)
print(collections.Counter(device))
print(collections.ItemsView(device))
print(collections.KeysView(device))
print(collections.MappingView(device))
for k,v in device.items():
print(k,v)
for k,v in sorted(device.items()):
print(k,v)
for item in collections.ItemsView(device):
print(item)
device.pop('type')
print(device)
def _viewratings(instance):
"Returns a :py:class:`collections.ItemsView` of its own ratings."
return collections.ItemsView(instance._ratings)
def _viewitems(instance):
"Returns a :py:class:`collections.ItemsView` of its own items."
return collections.ItemsView(instance._dict)
