// Copyright 2020 Contributors to the Parsec project.
// SPDX-License-Identifier: Apache-2.0
use std::convert::{TryFrom, TryInto};
use tss_esapi::structures::Digest;
// Digest has some custom functions for conversion to [u8; N] for common values of N
mod test_digests {
    use super::*;

    #[test]
    fn test_correctly_sized_digests() {
        // N = 20
        let sha1_ex = Digest::try_from((1..21).collect::<Vec<u8>>()).unwrap();
        let sha1: [u8; 20] = sha1_ex.try_into().unwrap();
        assert_eq!(sha1.to_vec(), (1..21).collect::<Vec<u8>>());
        // N = 32
        let sha256_ex = Digest::try_from((1..33).collect::<Vec<u8>>()).unwrap();
        let sha256: [u8; 32] = sha256_ex.try_into().unwrap();
        assert_eq!(sha256.to_vec(), (1..33).collect::<Vec<u8>>());
        // N = 48
        let sha384_ex = Digest::try_from((1..49).collect::<Vec<u8>>()).unwrap();
        let sha384: [u8; 48] = sha384_ex.try_into().unwrap();
        assert_eq!(sha384.to_vec(), (1..49).collect::<Vec<u8>>());
        // N = 64
        let sha512_ex = Digest::try_from((1..65).collect::<Vec<u8>>()).unwrap();
        let sha512: [u8; 64] = sha512_ex.try_into().unwrap();
        assert_eq!(sha512.to_vec(), (1..65).collect::<Vec<u8>>());
    }

    #[test]
    fn test_incorrectly_sized_digests() {
        // This test uses .err().unwrap() to get around the fact that [u8; N] is only
        //  Debug if N is LengthAtMost32, since .unwrap_err() requires T ([u8; N]): Debug
        // N = 20
        let example = Digest::try_from([0xff; 10].to_vec()).unwrap();
        TryInto::<[u8; 20]>::try_into(example).err().unwrap();
        // N = 32
        let example = Digest::try_from([0xff; 10].to_vec()).unwrap();
        TryInto::<[u8; 32]>::try_into(example).err().unwrap();
        // N = 48
        let example = Digest::try_from([0xff; 10].to_vec()).unwrap();
        TryInto::<[u8; 48]>::try_into(example).err().unwrap();
        // N = 64
        let example = Digest::try_from([0xff; 10].to_vec()).unwrap();
        TryInto::<[u8; 64]>::try_into(example).err().unwrap();
    }
}