//! Random number generator utilities used for tests
userand::RngCore;fnrandom_fill(buffer:&mut [u8]){letmut random =rand::thread_rng();
random.fill_bytes(buffer);}/// Generate random data of specific length.
pubfnrandom_vec(len:usize)->Vec<u8>{letmut data =vec![0u8; len];random_fill(&mut data);
data
}