def test_should_be_able_to_discard_existing(self):
s = OrderedSet([1, 2, 3])
s.discard(2)
assert list(s) == [1, 3]
def test_should_be_able_to_add_new(self):
s = OrderedSet([1, 2, 3])
s.add(4)
assert list(s) == [1, 2, 3, 4]
def test_should_be_able_to_clear(self):
s = OrderedSet([1, 2, 3])
s.clear()
assert list(s) == []
def test_should_be_iterable(self):
s = OrderedSet([1, 2, 3])
assert list(iter(s)) == [1, 2, 3]
def test_should_have_length(self):
s = OrderedSet([1, 2, 3])
assert len(s) == 3
def test_should_be_able_to_get_item_if_empty(self):
s = OrderedSet([])
with self.assertRaises(IndexError):
_ = s[0]
def test_should_be_able_to_get_items_by_index(self):
s = OrderedSet([1, 2, 3])
self.assertEqual(s[0], 1)
self.assertEqual(s[1], 2)
self.assertEqual(s[2], 3)
def test_should_contain_element(self):
s = OrderedSet([1, 2, 3])
assert 2 in s
def test_should_not_contain_non_element(self):
s = OrderedSet([1, 2, 3])
assert 4 not in s
def test_should_repr_as_set(self):
s = OrderedSet([1, 2, 3])
assert repr(s) == "{1, 2, 3}"
def test_should_be_able_to_replace(self):
s = OrderedSet([1, 2, 3])
s.replace([3, 4, 5])
assert list(s) == [3, 4, 5]
def test_should_be_able_to_update(self):
s = OrderedSet([1, 2, 3])
s.update([3, 4, 5])
assert list(s) == [1, 2, 3, 4, 5]
def test_should_not_be_able_to_remove_non_existing(self):
s = OrderedSet([1, 2, 3])
with self.assertRaises(ValueError):
s.remove(4)
def test_should_be_able_to_remove_existing(self):
s = OrderedSet([1, 2, 3])
s.remove(2)
assert list(s) == [1, 3]
