def test_or_raise1(self):
self.assertIsNone(EMPTY.or_raise(ValueError()))
def test_get2(self):
self.assertIsNone(EMPTY.get())
def test_or_else(self):
self.assertEqual(EMPTY.or_else(1), 1)
self.assertIsNone(Optional(None).or_else(10))
self.assertEqual(Optional(10).or_else(1), 10)
def test_present(self):
self.assertFalse(EMPTY.present())
self.assertTrue(Optional(None).present())
self.assertTrue(Optional(1).present())