def test_delete2(self):
doubleLinkedList = DoubleLinkedList()
doubleLinkedList.push(1)
doubleLinkedList.push(1)
doubleLinkedList.push(1)
doubleLinkedList.delete(1)
assert (doubleLinkedList.pop() == None and doubleLinkedList.len() == 0
and doubleLinkedList.first() == None
and doubleLinkedList.last() == None)
def test_len(self):
"""Test method which return count of elements in list"""
l_list = DoubleLinkedList()
l_list.push(12)
l_list.push(123)
l_list.push(1234)
l_list.push(1234)
l_list.pop()
l_list.pop()
self.assertEqual(l_list.len(), 2)
def test_negative(self):
doubleLinkedList = DoubleLinkedList()
assert ((doubleLinkedList.push(None)) == None
and doubleLinkedList.len() == 1)
def test_len_when_empty(self):
"""Test method which return count of elements in list, when list is empty"""
l_list = DoubleLinkedList()
self.assertEqual(l_list.len(), 0)
