def test_insert_on_position_0():
d = DoubleLinkedList([1])
d.insert(0, 0)
print("\n", d, "\n")
assert (len(d)) == 2
assert d[0] == 0
assert list(d) == [0, 1]
def test_insert_on_position_0():
d = DoubleLinkedList([1])
d.insert(0, 0)
print("\n", d, "\n")
assert (len(d)) == 2
assert d[0] == 0
assert list(d) == [0, 1]
def test_insert_on_position_minus_1():
d = DoubleLinkedList([1, 2, 4])
d.insert(-1, 3)
assert (len(d)) == 4
assert d[2] == 3
assert list(d) == [1, 2, 3, 4]
def test_insert_on_position_1():
d = DoubleLinkedList([1, 3, 4])
d.insert(1, 2)
assert (len(d)) == 4
assert d[1] == 2
assert list(d) == [1, 2, 3, 4]
def test_insert_on_position_0_larger():
d = DoubleLinkedList([1, 2])
d.insert(0, 0)
assert (len(d)) == 3
assert d[0] == 0
assert list(d) == [0, 1, 2]
def test_insert_on_empty():
d = DoubleLinkedList()
d.insert(0, 1)
assert (len(d)) == 1
assert d[0] == 1
def test_insert_on_position_minus_1():
d = DoubleLinkedList([1, 2, 4])
d.insert(-1, 3)
assert (len(d)) == 4
assert d[2] == 3
assert list(d) == [1, 2, 3, 4]
def test_insert_on_position_1():
d = DoubleLinkedList([1, 3, 4])
d.insert(1, 2)
assert (len(d)) == 4
assert d[1] == 2
assert list(d) == [1, 2, 3, 4]
def test_insert_on_position_0_larger():
d = DoubleLinkedList([1, 2])
d.insert(0, 0)
assert (len(d)) == 3
assert d[0] == 0
assert list(d) == [0, 1, 2]
def test_insert_on_empty():
d = DoubleLinkedList()
d.insert(0, 1)
assert (len(d)) == 1
assert d[0] == 1