White box testing examines internal code structure, logic, and flow to find defects.

Explanation:

• Requires programming knowledge to test control flow and data handling.
• Covers unit testing, security testing, and branch coverage.
• Performed by developers and security testers.

Example (Python Unit Test):

import unittest

def add(x, y):
    return x + y

class TestAddition(unittest.TestCase):
    def test_add(self):
        self.assertEqual(add(2, 3), 5)

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

• This checks if add(2, 3) correctly returns 5.