def test_insert_at_0_on_empty_list(self):
"""
Tests insertion of node on empty list
"""
l = LinkedList()
l.insert_at("hi", 0)
self.assertEqual(l.get_first().data, "hi")
def test_clear(self): linkedlist = LinkedList() linkedlist.insert(1) linkedlist.insert(2) self.assertEquals(1, linkedlist.head.value) linkedlist.clear() self.assertEquals(None, linkedlist.head)
def test_insert(self):
linkedlist = LinkedList()
linkedlist.insert(1)
linkedlist.insert(2)
linkedlist.insert(3)
nodeptr = linkedlist.head
for i in range(1, 4, 1):
self.assertEquals(i, nodeptr.value)
nodeptr = nodeptr.next
def test_remove_last_3(self):
"""
Tests the removal of last node in a list with three nodes
"""
l = LinkedList()
l.insert_first("c")
l.insert_first("b")
l.insert_first("a")
l.remove_last()
self.assertEqual(l.size(), 2)
self.assertEqual(l.get_last().data, "b")
def test_remove_at_first_node(self):
"""
Tests removal of first node
"""
l = LinkedList()
l.insert_last(1)
l.insert_last(2)
l.insert_last(3)
l.insert_last(4)
self.assertEqual(l.get_at(0).data, 1)
l.remove_at(0)
self.assertEqual(l.get_at(0).data, 2)
def test_remove_at_given_index(self):
"""
Tests for removal of node at given index
"""
l = LinkedList()
l.insert_last(1)
l.insert_last(2)
l.insert_last(3)
l.insert_last(4)
self.assertEqual(l.get_at(1).data, 2)
l.remove_at(1)
self.assertEqual(l.get_at(1).data, 3)
def test_insert_at_0_non_empty_list(self):
"""
Tests for insertion of node at index 0 on non-empty list
"""
l = LinkedList()
l.insert_last("a")
l.insert_last("b")
l.insert_last("c")
l.insert_at("hi", 0)
self.assertEqual(l.get_at(0).data, "hi")
self.assertEqual(l.get_at(1).data, "a")
self.assertEqual(l.get_at(2).data, "b")
self.assertEqual(l.get_at(3).data, "c")
def test_remove_first_size_1(self):
"""
Tests the removal of first node in list when list has one node
"""
l = LinkedList()
l.insert_first("a")
l.remove_first()
self.assertEqual(l.size(), 0)
self.assertEqual(l.get_first(), None)
def test_get_first(self):
"""
Tests that the first node of a list is returned
"""
l = LinkedList()
l.insert_first(1)
self.assertEqual(l.get_first().data, 1)
l.insert_first(2)
self.assertEqual(l.get_first().data, 2)
def test_insert_last(self):
"""
Tests adding a node to the end of a list
"""
l = LinkedList()
l.insert_first("a")
l.insert_last("b")
self.assertEqual(l.size(), 2)
self.assertEqual(l.get_last().data, "b")
def test_for_each(self):
"""
Test that a transform runs on each node
"""
def fn(node):
node.data += 10
l = LinkedList()
l.insert_last(1)
l.insert_last(2)
l.insert_last(3)
l.insert_last(4)
l.for_each(fn)
self.assertEqual(l.get_at(0).data, 11)
self.assertEqual(l.get_at(1).data, 12)
self.assertEqual(l.get_at(2).data, 13)
self.assertEqual(l.get_at(3).data, 14)
def test_remove_last_2(self):
"""
Tests the removal of last node in a list with two nodes
"""
l = LinkedList()
l.insert_first("b")
l.insert_first("a")
l.remove_last()
self.assertEqual(l.size(), 1)
self.assertEqual(l.get_last().data, "a")
self.assertEqual(l.get_last().next, None)
def test_size(self):
"""
Tests that the size of a linked list is returned
"""
l = LinkedList()
self.assertEqual(l.size(), 0)
l.insert_first(1)
l.insert_first(1)
l.insert_first(1)
l.insert_first(1)
self.assertEqual(l.size(), 4)
def test_insert_at_out_of_bounds(self):
"""
Tests that node is inserted at the end of a list when index is out of bounds
"""
l = LinkedList()
l.insert_last("a")
l.insert_last("b")
l.insert_at("hi", 30)
self.assertEqual(l.get_at(0).data, "a")
self.assertEqual(l.get_at(1).data, "b")
self.assertEqual(l.get_at(2).data, "hi")
def test_insert_at_last_index(self):
"""
Tests for insertion of node at the end of a list
"""
l = LinkedList()
l.insert_last("a")
l.insert_last("b")
l.insert_at("hi", 2)
self.assertEqual(l.get_at(0).data, "a")
self.assertEqual(l.get_at(1).data, "b")
self.assertEqual(l.get_at(2).data, "hi")
def test_remove_at_out_of_bounds(self):
"""
Tests for return of None when called on index that is out of bounds
"""
l = LinkedList()
l.insert_first("a")
l.remove_at(1)
self.assertEqual(l.remove_at(1), None)
def test_get_at(self):
"""
Tests the return of a node from a given index
"""
l = LinkedList()
l.insert_last(1)
l.insert_last(2)
l.insert_last(3)
l.insert_last(4)
self.assertEqual(l.get_at(0).data, 1)
self.assertEqual(l.get_at(1).data, 2)
self.assertEqual(l.get_at(2).data, 3)
self.assertEqual(l.get_at(3).data, 4)
def test_remove_last_1(self):
"""
Tests the removal of last node in a list with one node
"""
l = LinkedList()
l.insert_first("a")
l.remove_last()
self.assertEqual(l.head, None)
def test_insert_first(self):
"""
Tests appending a node to the start of the list
"""
l = LinkedList()
l.insert_first(1)
self.assertEqual(l.head.data, 1)
l.insert_first(2)
self.assertEqual(l.head.data, 2)
def test_for_in_loop_on_linked_list(self):
"""
Tests that a for of loop will work on a linked list
"""
l = LinkedList()
l.insert_last(1)
l.insert_last(2)
l.insert_last(3)
l.insert_last(4)
for node in l:
node.data += 10
self.assertEqual(l.get_at(0).data, 11)
self.assertEqual(l.get_at(1).data, 12)
self.assertEqual(l.get_at(2).data, 13)
self.assertEqual(l.get_at(3).data, 14)
def test_get_at_out_of_bounds(self):
"""
Tests the return of None from an index that is out of bounds
"""
l = LinkedList()
self.assertEqual(l.get_at(10), None)
def test_insert_at_middle_index(self):
"""
Test for insertion of node at index in the middle of a list
"""
l = LinkedList()
l.insert_last("a")
l.insert_last("b")
l.insert_last("c")
l.insert_last("d")
l.insert_at("hi", 2)
self.assertEqual(l.get_at(0).data, "a")
self.assertEqual(l.get_at(1).data, "b")
self.assertEqual(l.get_at(2).data, "hi")
self.assertEqual(l.get_at(3).data, "c")
self.assertEqual(l.get_at(4).data, "d")
def test_remove_first_size_3(self):
"""
Tests the removal of first node in list when list has three nodes
"""
l = LinkedList()
l.insert_first("c")
l.insert_first("b")
l.insert_first("a")
l.remove_first()
self.assertEqual(l.size(), 2)
self.assertEqual(l.get_first().data, "b")
l.remove_first()
self.assertEqual(l.size(), 1)
self.assertEqual(l.get_first().data, "c")
def test_remove_last_empty(self):
"""
Tests the return of None when run on empty list
"""
l = LinkedList()
self.assertEqual(l.remove_last(), None)
def test_delete(self): linkedlist = LinkedList() self.assertEquals(0, linkedlist.delete(5)) linkedlist.insert(1) self.assertEquals(1, linkedlist.head.value) self.assertEquals(1, linkedlist.delete(1)) self.assertEquals(None, linkedlist.head) linkedlist.clear() linkedlist.insert(1) linkedlist.insert(2) self.assertEquals(1, linkedlist.delete(1)) self.assertEquals(2, linkedlist.head.value) linkedlist.clear() linkedlist.insert(1) linkedlist.insert(2) linkedlist.insert(3) self.assertEquals(1, linkedlist.delete(2)) self.assertEquals(1, linkedlist.head.value) self.assertEquals(3, linkedlist.head.next.value) linkedlist.clear()
def test_clear(self):
"""
Test that a list is emptied
"""
l = LinkedList()
self.assertEqual(l.size(), 0)
l.insert_first(1)
l.insert_first(1)
l.insert_first(1)
l.insert_first(1)
self.assertEqual(l.size(), 4)
l.clear()
self.assertEqual(l.size(), 0)
