from solution import rolling_mean

CASES = [
    (([1, 2, 3, 4], 2), [1.5, 2.5, 3.5]),
]

failed = 0
for args, want in CASES:
    got = rolling_mean(*args)
    status = 'ok' if got == want else 'FAIL'
    failed += status == 'FAIL'
    print(status, 'rolling_mean', args, '->', repr(got), '(expected', repr(want) + ')')
print('passed', len(CASES) - failed, 'of', len(CASES))