def irreflexive_objects_are_not_nullish():
# Numpy arrays operate element-wise and the comparison operator returns arrays.
# Similar to math.nan, they are therefore not equal to themselves. However, we
# only want math.nan to be considered nullish, not values like numpy arrays.
class IrreflexiveValue:
def __eq__(self, other):
return False
def __bool__(self):
return False
value = IrreflexiveValue()
assert value != value
assert not value
assert is_nullish(value) is False
def undefined_is_nullish():
assert is_nullish(INVALID) is True
def nan_is_nullish():
assert is_nullish(nan) is True
def inf_is_not_nullish():
assert is_nullish(inf) is False
assert is_nullish(-inf) is False
def truthy_objects_are_not_nullish():
assert is_nullish("str") is False
assert is_nullish(1) is False
assert is_nullish([0]) is False
assert is_nullish({None: None}) is False
def falsy_objects_are_not_nullish():
assert is_nullish("") is False
assert is_nullish(0) is False
assert is_nullish([]) is False
assert is_nullish({}) is False
def null_is_nullish():
assert is_nullish(None) is True
def undefined_is_nullish():
assert is_nullish(Undefined) is True
