Test for python entry to https://codegolf.codidact.com/posts/287131

testing.py

def r(i):
 y,z=65537,1+(1<<32);s=257*y*z;n=(i|(i&252*s)*y>>10|(i&254*s)*z>>17|(i&127*s)*z>>15|(i&63*s)*y>>6)&(1<<64)-1
 return 64-n.bit_count()

test_case_string = """0 : 18446744073709551615 : 64
18446744073709551615 : 0 : 0
12273903644374837845 : 6172840429334713770 : 0
9819010546270478865 : 8627733527439072750 : 16
9223372036854775808 : 9223372036854775807 : 61
144115188075855872 : 18302628885633695743 : 60
4 : 18446744073709551611 : 59
16384 : 18446744073709535231 : 59
9007199254740992 : 18437736874454810623 : 57
35184372088832 : 18446708889337462783 : 55
8796361457664 : 18446735277348093951 : 48
17609903308800 : 18446726463806242815 : 36
18441077155848519679 : 5666917861031936 : 1
18440988645153550335 : 5755428556001280 : 2
9214294468855857151 : 9232449604853694464 : 1
18300371588261871615 : 146372485447680000 : 1
18446744073708891899 : 659716 : 1
18446744071024132079 : 2685419536 : 1
8637754208117850111 : 9808989865591701504 : 1
12643820184012849151 : 5802923889696702464 : 1
35184372089472 : 18446708889337462143 : 47"""

test_cases = [
    line.split(" : ")
    for line in test_case_string.split("\n")
]

results = [
    (int(test_case[0]), int(test_case[2]), r(int(test_case[0])))
    for test_case in test_cases
]

labelled_results = [
    (*result, "MISMATCH" if result[1] != result[2] else "")
    for result in results
]

result_strings = [
    f"Input: {item[0]:20} Expected: {item[1]:2} Actual: {item[2]:2} {item[3]}"
    for item in labelled_results
]

print("\n".join(result_strings))