How can I test validation functions in Python?

How can I test validation functions in Python?

You can use the unittest module to create test cases for your validation functions. Would you like an example?

Yes, please provide an example of a validation function and how to test it.

Sure! Here's a simple validation function that checks if an email is valid:

import re

def is_valid_email(email):
    pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
    return re.match(pattern, email) is not None

You can test it using unittest like this:

import unittest

class TestValidationFunctions(unittest.TestCase):
    def test_valid_email(self):
        self.assertTrue(is_valid_email('[email protected]'))

    def test_invalid_email(self):
        self.assertFalse(is_valid_email('invalid-email'))

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

That makes sense! How do I run the tests?

You can run the tests by executing the script in your terminal. Just navigate to the directory containing your test file and run python -m unittest your_test_file.py.