def test_it_decrements_line(self):
pos = Position(1, 3, 5)
cursor = Cursor(pos)
cursor.step_next_line()
cursor.step_prev_line()
self.assertEqual(pos, cursor.position)
def test_it_increments_line(self):
start, dest = Position(1, 3, 5), Position(1, 3 + 1, 0)
cursor = Cursor(start)
cursor.step_next_line()
self.assertEqual(dest, cursor.position)
