Have you had experience conducting functional tests during software development?

Yes, functional testing is checking the operation of a software product from the user's perspective to ensure that all functions work according to requirements.

In my experience, I wrote tests that checked:

• the correctness of user data processing,
• the proper functioning of business logic,
• interaction with external services.

For example, in Python using the unittest library, you can write a test for a function that calculates a discount:

import unittest

def calculate_discount(price, discount):
    return price - price * discount

class TestDiscount(unittest.TestCase):
    def test_calculate_discount(self):
        self.assertEqual(calculate_discount(100, 0.1), 90)

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

This approach helps ensure that functionality works as intended.