def test_length_of_list_after_list_change_operations(self):
singlyLinkedListObject = SinglyLinkedList()
inputList = range(10)
singlyLinkedListObject.populate(inputList)
expectedLength = len(inputList)
actualLength = len(singlyLinkedListObject)
self.assertTrue(expectedLength == actualLength, "Expected length: %s, Actual Length: %s" %(expectedLength, actualLength))
singlyLinkedListObject.deleteHead()
expectedLength -= 1
actualLength = len(singlyLinkedListObject)
self.assertTrue(expectedLength == actualLength, "Expected length: %s, Actual Length: %s" %(expectedLength, actualLength))
singlyLinkedListObject.insertAtHead(200)
expectedLength += 1
actualLength = len(singlyLinkedListObject)
self.assertTrue(expectedLength == actualLength, "Expected length: %s, Actual Length: %s" %(expectedLength, actualLength))
singlyLinkedListObject.insertAtHead(200)
expectedLength += 1
actualLength = len(singlyLinkedListObject)
self.assertTrue(expectedLength == actualLength, "Expected length: %s, Actual Length: %s" %(expectedLength, actualLength))
def test_changing_list_length_during_insert_at_head_operation(self):
singlyLinkedListObject = SinglyLinkedList()
expectedLength = 0
actualLength = len(singlyLinkedListObject)
self.assertTrue(expectedLength == actualLength, "Expected length: %s, Actual Length: %s" %(expectedLength, actualLength))
inputList = range(10)
for data in inputList:
singlyLinkedListObject.insertAtHead(data)
actualLength = len(singlyLinkedListObject)
expectedLength += 1 # Because a new element has been added to the list.
self.assertTrue(expectedLength == actualLength, "Expected length: %s, Actual Length: %s" %(expectedLength, actualLength))