def testNoOverwrite(self):
mapping = data_structures.Mapping()
original = data_structures.List()
mapping["a"] = original
with self.assertRaises(ValueError):
mapping["a"] = data_structures.List()
self.assertIs(original, mapping["a"])
with self.assertRaises(AttributeError):
del mapping["a"] # pylint: disable=unsupported-delete-operation
mapping.update(b=data_structures.Mapping())
with self.assertRaises(ValueError):
mapping.update({"b": data_structures.Mapping()})
def testHashing(self):
has_mappings = set(
[data_structures.Mapping(),
data_structures.Mapping()])
self.assertEqual(2, len(has_mappings))
self.assertNotIn(data_structures.Mapping(), has_mappings)
# In contrast to Mapping, dict wrappers are not hashable
a = tracking.AutoTrackable()
a.d = {}
self.assertEqual({}, a.d)
self.assertFalse({} != a.d) # pylint: disable=g-explicit-bool-comparison
self.assertNotEqual({1: 2}, a.d)
with self.assertRaisesRegex(TypeError, "unhashable"):
set([a.d])
def __init__(self, fn=None, share_variables=False):
self._fn = fn
self._share_variables = share_variables
self._variables_by_name = data_structures.Mapping()
def testNonStringKeys(self):
mapping = data_structures.Mapping()
with self.assertRaises(TypeError):
mapping[1] = data_structures.List()