class DoublyDoublyLinkedList_Test_Operations_On_List_with_1000_Random_Elements(
unittest.TestCase):
def setUp(self):
self._linked_list = DoublyLinkedList()
self._shadow_list = []
for i in range(10):
random_element = randint(0, 1000)
self._linked_list.append(random_element)
self._shadow_list.append(
random_element) #will keep track of count and index
def test_count_index_remove_index_count_on_each_removal(self):
"""
Check count, index before and after each predictable removal operation
"""
for i in self._shadow_list[:]:
self.assertEqual(self._linked_list.length, len(self._shadow_list))
self.assertEqual(self._linked_list.index(i),
self._shadow_list.index(i))
self._shadow_list.remove(i)
self._linked_list.remove(i)
try:
self._shadow_list.index(i)
self.assertEqual(self._linked_list.index(i),
self._shadow_list.index(i))
except ValueError:
self.assertEqual(self._linked_list.index(i), -1)
self.assertEqual(self._linked_list.length, len(self._shadow_list))
class DoublyDoublyLinkedList_Test_Remove_Non_Existing_Element_From_0_Element_List(
unittest.TestCase):
def setUp(self):
self._doubly_linkedList = DoublyLinkedList()
def test_count_of_list(self):
self._doubly_linkedList.remove(-1)
self.assertEqual(self._doubly_linkedList.length, 0,
'Length must be 0 for empty list')
def tearDown(self):
self._doubly_linkedList = None
class DoublyDoublyLinkedList_Test_Check_Head_On_Remove_In_4_Element_List(
unittest.TestCase):
def setUp(self):
self._doubly_linkedList = DoublyLinkedList()
self._doubly_linkedList.append(1)
self._doubly_linkedList.append(2)
self._doubly_linkedList.append(3)
self._doubly_linkedList.append(4)
def test_tail_node_on_remove(self):
#list is [1, 2, 3, 4]
self._doubly_linkedList.remove(
3) #removed head. Head must be same node
self.assertEqual(self._doubly_linkedList.head, 1)
#Now list is [1, 2, 4]
self._doubly_linkedList.remove(1) #head should next be 2
self.assertEqual(self._doubly_linkedList.head, 2,
'head must be adjusted on deletion of first node')
#Now list is [2, 4]
self._doubly_linkedList.remove(2) #head should next be 4
self.assertEqual(self._doubly_linkedList.head, 4,
'head must be adjusted on deletion of first node')
#Now list is [4]
self._doubly_linkedList.remove(4) #head should next be None
self.assertEqual(self._doubly_linkedList.head, None,
'Head must be None on empty list')
def tearDown(self):
self._doubly_linkedList = None
class DoublyDoublyLinkedList_Test_Check_Tail_On_Remove_In_4_Element_List(
unittest.TestCase):
def setUp(self):
self._doubly_linkedList = DoublyLinkedList()
self._doubly_linkedList.append(1)
self._doubly_linkedList.append(2)
self._doubly_linkedList.append(3)
self._doubly_linkedList.append(4)
def test_tail_node_on_remove(self):
self._doubly_linkedList.remove(
1) #removed head. Tail must be same node
self.assertEqual(self._doubly_linkedList.tail, 4)
#Now list is [2, 3, 4]
self._doubly_linkedList.remove(4) #tail should next be 3
self.assertEqual(self._doubly_linkedList.tail, 3,
'Tail must be adjusted on deletion of last node')
#Now list is [2, 3]
self._doubly_linkedList.remove(2) #tail should next be 3
self.assertEqual(self._doubly_linkedList.tail, 3,
'Tail must be adjusted on deletion of last node')
#Now list is [3]
self._doubly_linkedList.remove(3) #tail should next be None
self.assertEqual(self._doubly_linkedList.tail, None,
'Tail must be None on empty list')
def tearDown(self):
self._doubly_linkedList = None
class DoublyDoublyLinkedList_Test_Remove_Middle_Element_From_4_Element_List(
unittest.TestCase):
def setUp(self):
self._doubly_linkedList = DoublyLinkedList()
self._doubly_linkedList.append(1)
self._doubly_linkedList.append(2)
self._doubly_linkedList.append(3)
self._doubly_linkedList.append(4)
def test_count_of_list(self):
self._doubly_linkedList.remove(3)
self.assertEqual(
self._doubly_linkedList.length, 3,
'Length not valid after trying to remove non-existin element')
def tearDown(self):
self._doubly_linkedList = None
print('Tail of list is: %s' % str(double_link_list.tail))
print('Print list by iterating')
#Find an element's index
element = 4
element_index = double_link_list.index(element)
if element_index == -1:
print('Element %s was not found on list' % str(element))
else:
print('Element %s found at index %s' %
(str(element), str(element_index)))
#Lets delete 7
print('Deleting 7')
element_to_remove = 7
double_link_list.remove(element_to_remove)
#Try to find it.
print('Trying to find %s' % str(element_to_remove))
index_of_deleted = double_link_list.index(element_to_remove)
print('Index of deleted element is %s' % str(index_of_deleted))
#print list again
print_list(double_link_list)
#
#Lets insert 7 at index 5
print('Insert 7 into the list at index 4')
element_to_insert = 7
index_at = 5
double_link_list.insert_at(index=index_at, element=element_to_insert)
print_list(double_link_list)
