def test_non_null(self, k, v):
""" AD is sensitive to value updates """
ad = AttMap()
assert not ad.is_null(k) and not ad.non_null(k)
ad[k] = None
assert ad.is_null(k) and not ad.non_null(k)
ad[k] = v
assert not ad.is_null(k) and ad.non_null(k)
def test_is_null(self, item):
""" Null-valued key/item evaluates as such. """
ad = AttMap()
ad[item] = None
assert ad.is_null(item) and not ad.non_null(item)
def test_missing_is_neither_null_nor_non_null(self, item):
""" Value of absent key is neither null nor non-null """
ad = AttMap()
assert not ad.is_null(item) and not ad.non_null(item)