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from .helper import UnitHelper

from github3.null import NullObject

import pytest

class TestNullObject(UnitHelper):

described_class = NullObject

def create_instance_of_described_class(self):

return self.described_class()

def test_returns_empty_list(self):

assert list(self.instance) == []

def test_contains_nothing(self):

assert 'foo' not in self.instance

def test_returns_itself_when_called(self):

assert self.instance('foo', 'bar', 'bogus') is self.instance

def test_returns_empty_string(self):

assert str(self.instance) == ''

def test_allows_arbitrary_attributes(self):

assert self.instance.attr is self.instance

def test_allows_arbitrary_attributes_to_be_set(self):

self.instance.attr = 'new'

assert self.instance.attr is self.instance

def test_provides_an_api_to_check_if_it_is_null(self):

assert self.instance.is_null()

def test_stops_iteration(self):

with pytest.raises(StopIteration):

next(self.instance)

def test_next_raises_stops_iteration(self):

with pytest.raises(StopIteration):

self.instance.next()

def test_getitem_returns_itself(self):

assert self.instance['attr'] is self.instance

def test_setitem_sets_nothing(self):

self.instance['attr'] = 'attr'

assert self.instance['attr'] is self.instance

def test_turns_into_unicode(self):

unicode_str = b''.decode('utf-8')

try:

assert unicode(self.instance) == unicode_str

except NameError:

assert str(self.instance) == unicode_str

def test_instances_are_falsey(self):

if self.instance:

pytest.fail()

def test_instances_can_be_coerced_to_zero(self):

assert int(self.instance) == 0