Write a python function to count the number of digits of a given number.
def count_Digit(n):
    count = 0
    while n != 0:
        n //= 10
        count += 1
    return count
<s>[INST]<<SYS>>Given a task and its code, generate test cases for the code.<</SYS>>Write a python function to count the number of digits of a given number.
def count_Digit(n):
    count = 0
    while n != 0:
        n //= 10
        count += 1
    return count[/INST]assert count_Digit(12345) == 5
assert count_Digit(11223305) == 8
assert count_Digit(4123459) == 7</s>