Have you tried conducting testing in your previous project or job?

Yes, I have conducted testing in my projects using various approaches. In Python, the unittest or pytest modules are often used for writing automated tests.

For example, a simple test of an addition function using unittest:

import unittest

def add(a, b):
    return a + b

class TestAddFunction(unittest.TestCase):
    def test_add_positive_numbers(self):
        self.assertEqual(add(2, 3), 5)

    def test_add_negative_numbers(self):
        self.assertEqual(add(-1, -1), -2)

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

Testing helps ensure that the code works correctly and facilitates early detection of errors during development.