How to use the ahk.start function in ahk

def test_00_Function(self):
        """Testing Function wrapper object."""
        tests = (
            (1, 1),
            ('2', 2),
            ('3', '4'),
            (10, 11),
            (100, 1000),
        )
        # Startup
        ahk.start()
        ahk.ready()
        # Define our function
        add = ahk.Function('add', int, '(x, y)', 'return x + y')
        # Test with an assortment of values
        for x, y in tests:
            result = add(x, y)
            expect = int(x) + int(y)
            self.assertEqual(result, expect,
                             msg="Unexpected result {0}, expected {1}!".format(
                             result, expect))

        with self.assertRaises(ValueError):
            # Error during type conversion
            add('abc', 'efg')
        # Cleanup
        ahk.terminate()