def test_get():
skiplist = SkiplistList()
assert skiplist.add(0, 10) == True
assert skiplist.add(1, 20) == True
assert skiplist.add(1, 15) == True
assert skiplist.add(4, 40) == False
assert skiplist.add(5, 40) == False
assert skiplist.get(0) == 10
assert skiplist.get(1) == 15
assert skiplist.get(2) == 20
assert skiplist.get(4) == None
def test_set():
skiplist = SkiplistList()
assert skiplist.add(0, 10) == True
assert skiplist.add(1, 20) == True
assert skiplist.add(2, 10) == True
assert skiplist.add(3, 40) == True
assert skiplist.add(1, 40) == True
assert skiplist.set(0, 11) == True
assert skiplist.get(0) == 11
assert skiplist.set(2, 22) == True
assert skiplist.get(2) == 22
assert skiplist.set(3, 44) == True
assert skiplist.get(3) == 44
assert skiplist.set(2, 25) == True
assert skiplist.get(2) == 25
def test_set(): ###
skiplist = SkiplistList()
assert skiplist.add(0, 10) == True
assert skiplist.add(1, 20) == True
assert skiplist.add(2, 10) == True
assert skiplist.add(3, 40) == True
assert skiplist.add(1, 40) == True
assert skiplist.set(0, 11) == True
assert skiplist.get(0) == 11
assert skiplist.set(2, 22) == True
assert skiplist.get(2) == 22
assert skiplist.set(3, 44) == True
assert skiplist.get(3) == 44
assert skiplist.set(2, 25) == True
assert skiplist.get(2) == 25
assert skiplist.dummy.back.data == 40
def test_absorb():
skiplist = SkiplistList()
skiplist2 = SkiplistList()
skiplist3 = SkiplistList()
a=["Alice","Bob","Eve"]
for i,x in enumerate(a[0]):
skiplist.add(i,x)
for i,x in enumerate(a[1]):
skiplist2.add(i,x)
for i,x in enumerate(a[2]):
skiplist3.add(i,x)
skiplist2.absorb(skiplist3)
x=a[1]+a[2]
for i in range(len(x)):
assert skiplist2.get(i) == x[i]
y=a[0]+x
skiplist.absorb(skiplist2)
for i in range(len(y)):
assert skiplist.get(i) == y[i]
assert skiplist.get(len(y)-2) == 'v'
def test_truncate():
skiplist = SkiplistList()
a = ["abcdefghi", "ct is awesome"]
for i, x in enumerate(a[0]):
skiplist.add(i, x)
skiplist.truncate(5)
assert skiplist.get(0) == 'a'
assert skiplist.get(-1) == 'e'
for i in range(5):
skiplist.get(i) == a[0][i]
skiplist = SkiplistList()
for i, x in enumerate(a[1]):
skiplist.add(i, x)
skiplist.truncate(7)
assert skiplist.get(0) == 'c'
assert skiplist.get(-1) == 'a'
for i in range(7):
skiplist.get(i) == a[1][i]
assert skiplist.dummy.back.data == 'a'