# test_LList2.py
# unittest example

import sys
import unittest

sys.path.insert(0, '..')
from LList2 import *

class LListTest(unittest.TestCase):
       
    def testConstructorEmpty(self):

        list0 = LList()
        self.assertEqual(list0.head, None)
        self.assertEqual(list0.tail, None)
        self.assertEqual(list0.size, 0)
        self.assertEqual(len(list0), 0)

    def testConstructorOne(self):

        list1 = LList([11])
        self.assertEqual(list1.head, list1.tail)
        self.assertEqual(list1.head.item, 11)
        self.assertEqual(list1.head.link, None)
        self.assertEqual(len(list1), list1.size)
        self.assertEqual(list1.size, 1)
 

    def testConstructorTwo(self):

        list1 = LList([11, 22])
        self.assertNotEqual(list1.head, list1.tail)
        self.assertEqual(list1.head.item, 11)
        self.assertEqual(list1.tail.item, 22)
        self.assertEqual(list1.head.link, list1.tail)
        self.assertEqual(list1.size, 2)
        self.assertEqual(len(list1), 2)

    def testConstructorThree(self):

        list1 = LList([11, 22, 33])
        self.assertNotEqual(list1.head, list1.tail)
        self.assertEqual(list1.head.item, 11)
        self.assertEqual(list1.tail.item, 33)
        self.assertEqual(list1.head.link.item, 22)
        self.assertEqual(list1.head.link.link, list1.tail)
        self.assertEqual(list1.size, 3)
        self.assertEqual(len(list1), 3)

    def testInsertAtHead(self):

        list1 = LList([11, 22])
        b = list1.head
        t = list1.tail
        list1._insertathead(0)
        self.assertNotEqual(list1.head, b)
        self.assertEqual(list1.head.item, 0)
        self.assertEqual(list1.head.link.item, 11)
        self.assertEqual(t, list1.tail)
        self.assertEqual(list1.size, 3)
        self.assertEqual(len(list1), 3)

    def testAppend(self):

        list1 = LList([11, 22])
        b = list1.head
        t = list1.tail
        list1.append(0)
        self.assertEqual(list1.head, b)
        self.assertNotEqual(list1.tail, t)
        self.assertEqual(list1.tail.item, 0)
        self.assertEqual(list1.size, 3)
        self.assertEqual(len(list1), 3)

    def testPop(self):

        list1 = LList([11, 22])
        b = list1.head
        t = list1.tail
        x = list1.pop()
        self.assertEqual(x, 22)
        self.assertNotEqual(t, list1.tail)
        self.assertEqual(list1.tail.item, 11)
        x = list1.pop()
        self.assertEqual(x, 11)
        self.assertEqual(list1.tail, None)
        self.assertEqual(list1.head, None)

    def testInsert(self):

        list1 = LList([11, 22, 33])
        t = list1.tail
        list1.insert(list1.size, 44)
        self.assertNotEqual(t, list1.tail)
        self.assertEqual(list1.tail.item, 44)
        self.assertEqual(list1.size, 4)

    def testCount(self):
        
        list1 = LList([11, 22, 33, 11])
        self.assertEqual(list1.count(11), 2)
        self.assertEqual(list1.count(22), 1)
        self.assertEqual(list1.count(44), 0)
        
        
def main(argv):
    unittest.main()

if __name__ == '__main__':
    main(sys.argv)