import unittest

class WorkerTests(unittest.TestCase):
    def test_initialization(self):
        worker = Worker('Ivan Ivanov', 1000, 10)
        self.assertEqual('Ivan Ivanov', worker.name)
        self.assertEqual(1000, worker.salary)
        self.assertEqual(10, worker.energy)
        self.assertEqual(0, worker.money)

    def test_rest(self):
        worker = Worker('Ivan Ivanov', 1000, 10)
        worker.rest()
        self.assertEqual(worker.energy, 11)

    def test_work_with_not_enough_energy(self):
        worker = Worker('Ivan Ivanov', 1000, 0)
        with self.assertRaises(Exception) as context:
            worker.work()
        self.assertEqual(str(context.exception), 'Not enough energy.')

    def test_work_with_negative_energy(self):
        worker = Worker('Ivan Ivanov', 1000, -1)
        with self.assertRaises(Exception) as context:
            worker.work()
        self.assertEqual(str(context.exception), 'Not enough energy.')

    def test_work_and_increase_money(self):
        worker = Worker('Ivan Ivanov', 1000, 10)
        worker.work()
        self.assertEqual(worker.money, 1000)

    def test_decrease_energy(self):
        worker = Worker('Ivan Ivanov', 1000, 10)
        worker.work()
        self.assertEqual(worker.energy, 9)

    def test_get_info_returns_correct_string(self):
        worker = Worker('Ivan Ivanov', 1000, -1)
        self.assertEqual(worker.get_info(), f'Ivan Ivanov has saved 0 money.')

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