"""
Unit Tests for the Linked Lists implementations
@jlengrand
2013/12
"""

from ll import SingleListItem
from ll import SingleLinkedList

import unittest

class test_single_linked_list_item(unittest.TestCase):

    def test_item(self):

        a = 12
        t = SingleListItem(12)

        self.assertEqual(a, t.value)

	def test_has_next(self):
		a = 12
        t = SingleListItem(12)

        self.assertEqual(False, t.has_next())

        b = SingleListItem(13, t)
        self.assertEqual(True, b.has_next())


class test_single_linked_list(unittest.TestCase):

    def test_add(self):
        a = 12
        sl = SingleLinkedList()

        sl.add(a)
        self.assertEqual(1, len(sl))

        sl.add(a)
        self.assertEqual(2, len(sl))

    def test_delete_item(self):
        sl = SingleLinkedList()

        sl.add(1)
        sl.add(2)
        sl.add(3)
        self.assertEqual(3, len(sl))

        self.assertEqual(1, sl._root.value)

        self.assertRaises(Exception, lambda x : sl.delete_item(4))

        sl.delete_item()
        self.assertEqual(2, len(sl))
        self.assertEqual(2, sl._root.value)


        sl.add(4)
        sl.add(5)
        sl.add(6)
        print sl

if __name__ == "__main__":
    unittest.main()