def setUp(self):
self.s = OrderedSet('abcdefg')
def test_discard_nonexistent_value(self):
s = OrderedSet('abcdef')
self.assertIs(s.discard('z'), None)
def test_add_existing_value(self):
s = OrderedSet('abcdef')
prev = len(s)
s.add('a')
self.assertEqual(len(s), prev)
def test_discard_existing_value(self):
s = OrderedSet('abcdef')
self.assertIs(s.discard('a'), None)
def test_add_new_value(self):
s = OrderedSet('abcdef')
prev = len(s)
s.add('z')
self.assertEqual(len(s), prev + 1)
