def test_extend():
dl = DiskList()
dl.extend([])
dl.extend(range(100))
dl.extend([])
dl.extend(list(range(100, 200)))
for val in range(200, 300):
dl.extend([val] * (val - 199))
dl.destroy()
def test_contains():
dl = DiskList()
assert 0 not in dl
dl.extend(range(10))
for val in range(10):
assert val in dl
assert 10 not in dl
dl.destroy()
def test_extend_valueerror2():
dl = DiskList(range(20))
dl.extend([17, 18, 19, 20, 21, 22, 23])
dl.destroy()
def test_extend_valueerror1():
dl = DiskList()
dl.extend([1, 2, 3, 5, 4, 6])
dl.destroy()
