def test_cycle_stringify():
a = JsonObj(**{"a": 'c', "herm": 123})
b = JsonObj(**{"c": 'c', 'd': a})
a.circle = b
with pytest.raises((TypeError, ValueError)):
json_str = a.to_json()
def test_cycle_eject():
a = JsonObj(**{"a": 'c', "herm": 123})
b = JsonObj(**{"c": 'c', 'd': a})
a.circle = b
astring = str(a)
assert isinstance(astring, str)