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import pickle
from pytest import warns
from graphql.pyutils import Undefined, UndefinedType
def describe_Undefined():
def has_repr():
assert repr(Undefined) == "Undefined"
def has_str():
assert str(Undefined) == "Undefined"
def is_hashable():
assert hash(Undefined) == hash(Undefined)
assert hash(Undefined) != hash(None)
assert hash(Undefined) != hash(False)
assert hash(Undefined) != hash(True)
def as_bool_is_false():
assert bool(Undefined) is False
def only_equal_to_itself():
assert Undefined == Undefined
assert not Undefined != Undefined
none_object = None
assert Undefined != none_object
assert not Undefined == none_object
false_object = False
assert Undefined != false_object
assert not Undefined == false_object
def cannot_be_redefined():
with warns(RuntimeWarning, match="Redefinition of 'Undefined'"):
redefined_undefined = UndefinedType()
assert redefined_undefined is Undefined
def can_be_pickled():
pickled_undefined = pickle.dumps(Undefined)
unpickled_undefined = pickle.loads(pickled_undefined)
assert unpickled_undefined is Undefined
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