import re
import unittest

## def is_valid_phone_number(phone_number : str):
    ## return bool(re.search(r"^(\d{3}-){2}\d{4}$", phone_number))

import unittest

class TestPhoneNumberRegex(unittest.TestCase):
    def test_if_valid(self):
        test_cases = [
            ("123-456-7890", True),   # Valid format
            ("111-222-3333", True),   # Another valid format
            ("abc-def-ghij", False),  # Letters instead of digits
            ("1234567890", False),    # Missing dashes
            ("123-45-67890", False),  # Wrong grouping
            ("12-3456-7890", False),  # Wrong grouping again
            ("", False),              # Empty string
        ]
        print("\nPHONE NUMBER VALIDATION TEST RESULTS")

        for phone, expected in test_cases:
            try:
                actual = is_valid_phone_number(phone)  # pyright: ignore[reportUndefinedVariable]
                status = "✓ PASS" if actual == expected else "✗ FAIL"
                print(f"{status} | Input: '{phone}' -> Got: {actual} | Expected: {expected}")
                self.assertEqual(actual, expected)
            except Exception as e:
                print(f"✗ ERROR | Input: '{phone}' -> Exception: {e}")
                raise

if __name__ == "__main__":
    unittest.main(verbosity=2)