# my_extension_test.py
import unittest
import my_extension

class MyExtensionTest(unittest.TestCase):
    def test_empty(self):
        result = my_extension.dot_product([], [])
        self.assertAlmostEqual(0, result)

    def test_positive_result(self):
        result = my_extension.dot_product(
            [3, 4, 5],
            [-1, 9, -2.5],
        )
        self.assertAlmostEqual(20.5, result)

...

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