class DoublyDoublyLinkedList_Test_Remove_Duplicates_With_Recurring_Duplicates(
unittest.TestCase):
def setUp(self):
#build [2, 1, 1, 1, 3, 1, 1, 1, 4]
self._doubly_linkedList = DoublyLinkedList()
self._doubly_linkedList.append(2)
element_to_append = 1
self._doubly_linkedList.extend(
[element_to_append, element_to_append, element_to_append])
self._doubly_linkedList.append(3)
self._doubly_linkedList.extend(
[element_to_append, element_to_append, element_to_append])
self._doubly_linkedList.append(4)
def test_remove_duplicates_of_list_with_recurring_duplicates(self):
expected_head = self._doubly_linkedList._head
expected_tail = self._doubly_linkedList._tail
self._doubly_linkedList.remove_duplicates()
expected_length = 4
self.assertEqual(
self._doubly_linkedList.length, expected_length,
'list length did not add up after removing duplicates')
self.assertEqual(self._doubly_linkedList._head, expected_head,
'list head did not add up after removing duplicates')
self.assertEqual(self._doubly_linkedList._tail, expected_tail,
'list tail did not add up after removing duplicates')
def tearDown(self):
self._doubly_linkedList = None
class DoublyDoublyLinkedList_Test_Remove_Duplicates_With_Duplicates_At_Tail(
unittest.TestCase):
def setUp(self):
#build [2, 1, 1, 1]
self._doubly_linkedList = DoublyLinkedList()
self._doubly_linkedList.append(2)
element_to_append = 1
self._doubly_linkedList.extend(
[element_to_append, element_to_append, element_to_append])
def test_remove_duplicates_of_list_with_2_identical_elements(self):
expected_head = self._doubly_linkedList._head
expected_tail = self._doubly_linkedList._head.next_node
self._doubly_linkedList.remove_duplicates()
expected_length = 2
self.assertEqual(
self._doubly_linkedList.length, expected_length,
'list length did not add up after removing duplicates')
self.assertEqual(self._doubly_linkedList._head, expected_head,
'list head did not add up after removing duplicates')
self.assertEqual(self._doubly_linkedList._tail, expected_tail,
'list tail did not add up after removing duplicates')
def tearDown(self):
self._doubly_linkedList = None
class DoublyDoublyLinkedList_Test_extend_With_Predictable_Elements(
unittest.TestCase):
'''
Test the extend operation of LinkedList.
a) Create 2 lists.
b) Add the second list to the end of the first list.
c) Check the indices of the newly added elements.
'''
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)
#create a second linkedlist with 5, 6, 7
self._secondList = DoublyLinkedList()
self._secondList.append(5)
self._secondList.append(6)
self._secondList.append(7)
def test_extend_of_list(self):
self.assertEqual(self._doubly_linkedList.length, 4,
'Original list before extend must be 4')
count_before_extend = self._doubly_linkedList.length
next_index_will_be = count_before_extend
self._doubly_linkedList.extend(self._secondList)
#check new length
self.assertEqual(self._doubly_linkedList.length,
count_before_extend + self._secondList.length,
'New length after extend must add up.')
#check if the elements of shadow list are present
for element in self._secondList:
self.assertEqual(
self._doubly_linkedList.index(element), next_index_will_be,
'Indices of new elements after extend must add up')
next_index_will_be += 1
def tearDown(self):
self._doubly_linkedList = None
self._secondList = None
print('Reversed List is now %s' % elements_in_list)
#length of the list
print('Length of the list is %s' % len(double_link_list))
if __name__ == '__main__':
double_link_list = DoublyLinkedList()
#add one element
print('Adding element 1 to list')
double_link_list.append(1)
#we add the following list (iterable) of elements
print('Adding elements 2 ,3 , 4, 5, 6, 7, 8, 9, 10')
elements = [2, 3, 4, 5, 6, 7, 8, 9, 10]
double_link_list.extend(elements)
#head
print('Head of list is: %s' % str(double_link_list.head))
#tail
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' %
