Where is caesar ?

def caesar_cipher(text, shift):

    def shift_char(c, shift):

        if c.isalpha():

            ascii_offset = ord('A') if c.isupper() else ord('a')

            shifted = chr((ord(c) - ascii_offset + shift) % 26 + ascii_offset)

            return shifted

        else:

            return c

   

    encoded_text = ""

    for char in text:

        encoded_text += shift_char(char, shift)

    return encoded_text

def get_user_input():

    text = input("Enter the text to be encrypted: ")

    while True:

        try:

            shift = int(input("Enter the shift amount: "))

            break

        except ValueError:

            print("Invalid input. Please enter an integer for the shift amount.")

    return text, shift

def main():

    text, shift = get_user_input()

    encrypted_text = caesar_cipher(text, shift)

    print("Encrypted text:", encrypted_text)

def caesar_decipher(text, shift):

    return caesar_cipher(text, -shift)

def run_tests():

    test_cases = [

        ("Hello, World!", 3, "Khoor, Zruog!"),

        ("abcXYZ", 2, "cdeZAB"),

        ("Python", 5, "Udymts"),

        ("Caesar Cipher", 4, "Geiwev Gmtliv")

    ]

   

    for i, (text, shift, expected) in enumerate(test_cases):

        result = caesar_cipher(text, shift)

        assert result == expected, f"Test case {i+1} failed: {result} != {expected}"

        print(f"Test case {i+1} passed.")

if __name__ == "__main__":

    main()