def test_value_not_found(self):
# None is returned if the collection does not contain the requested
# item.
item = _get_by_attr(self.collection, self.attr, '__does_not_exist__')
self.assertIsNone(item)
def test_attr_not_found(self):
# An AttributeError is raised if items in collection does not have the
# required attribute.
with self.assertRaises(AttributeError):
_get_by_attr(self.collection, 'another_attr', 0)
def test_item_found(self):
# Ensure an object instance is correctly returned if found in
# the collection.
item = _get_by_attr(self.collection, self.attr, 3)
self.assertEqual(3, item.myattr)
