def test_replace_first(self):
expected = PositionalList.from_iterable('Abcd')
pl = PositionalList()
a = pl.add_first('a')
b = pl.add_after(a, 'b')
c = pl.add_last('c')
d = pl.add_after(c, 'd')
ret = pl.replace(a, 'A')
self.assertEqual(ret, 'a')
self.assertEqual(pl, expected)
def test_add_after_a_in_abc(self):
pl = PositionalList()
a = pl.add_last('a')
b = pl.add_last('b')
c = pl.add_last('c')
forty_one = pl.add_after(a, 41)
forty_two = pl.add_after(forty_one, 42)
expected_after_forty_one = forty_two
actual_after_forty_one = pl.after(forty_one)
self.assertEqual(expected_after_forty_one, actual_after_forty_one)
def test_add_first_after_before_len(self):
pl = PositionalList()
a = pl.add_first('a')
self.assertEqual(len(pl), 1)
b = pl.add_after(a, 'b')
self.assertEqual(len(pl), 2)
c = pl.add_last('c')
self.assertEqual(len(pl), 3)
d = pl.add_after(c, 'd')
self.assertEqual(len(pl), 4)
def test_not_equal(self):
pl1 = PositionalList.from_iterable('cba')
pl2 = PositionalList()
a = pl2.add_first('a')
b = pl2.add_after(a, 'b')
c = pl2.add_last('c')
self.assertNotEqual(pl1, pl2)
def test_delete_len(self):
pl = PositionalList()
a = pl.add_first('a')
b = pl.add_after(a, 'b')
c = pl.add_last('c')
d = pl.add_after(c, 'd')
self.assertEqual(len(pl), 4)
pl.delete(a)
self.assertEqual(len(pl), 3)
pl.delete(pl.first())
self.assertEqual(len(pl), 2)
pl.delete(pl.last())
self.assertEqual(len(pl), 1)
self.assertTrue(pl)
pl.delete(c)
self.assertEqual(len(pl), 0)
self.assertFalse(pl)
def test_add_after_c_in_abc(self):
pl = PositionalList()
a = pl.add_last('a')
b = pl.add_last('b')
c = pl.add_last('c')
forty_two = pl.add_after(c, 42)
actual_after_forty_two = pl.after(forty_two)
self.assertIsNone(actual_after_forty_two)
def test_delete_first(self):
expected = PositionalList.from_iterable('bc')
pl = PositionalList()
a = pl.add_first('a')
b = pl.add_after(a, 'b')
c = pl.add_last('c')
db = pl.delete(a)
self.assertEqual(pl, expected)
self.assertEqual(db, 'a')
def test_add_after_b_in_abc(self):
pl = PositionalList()
a = pl.add_last('a')
b = pl.add_last('b')
c = pl.add_last('c')
forty_two = pl.add_after(b, 42)
expected_after_forty_two = c
actual_after_forty_two = pl.after(forty_two)
self.assertEqual(expected_after_forty_two, actual_after_forty_two)