pub fn from_seed(seed: u32) -> Self {
        let private_key_bytes = H256::from_low_u64_be(u64::from(seed) + 1);
        Self::new(K256PrivateKey::from_bytes(private_key_bytes).unwrap())
    }
Creates an account deterministically from the provided seed.
core/lib/test_contracts/src/lib.rs