You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: id.rs
    path of file: ./repos/grin/core/src/core
    
    the code of the file until where you have to start completion: // Copyright 2021 The Grin Developers
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! short ids for compact blocks

use crate::core::hash::{DefaultHashable, Hash, Hashed};
use crate::ser::{self, Readable, Reader, Writeable, Writer};
use byteorder::{ByteOrder, LittleEndian};
use siphasher::sip::SipHasher24;
use std::cmp::{min, Ordering};
use util::ToHex;

/// The size of a short id used to identify inputs|outputs|kernels (6 bytes)
pub const SHORT_ID_SIZE: usize = 6;

/// A trait for types that have a short_id (inputs/outputs/kernels)
pub trait ShortIdentifiable {
	/// The short_id of a kernel uses a hash built from the block_header *and* a
	/// connection
    
	fn test_short_id() {
		// minimal struct for testing
		// make it implement Writeable, therefore Hashable, therefore ShortIdentifiable
		struct Foo(u64);
		impl Writeable for Foo {
			fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ser::Error> {
				writer.write_u64(self.0)?;
				Ok(())
			}
		}

		impl DefaultHashable for Foo {}

		let foo = Foo(0);

		let expected_hash =
			Hash::from_hex("81e47a19e6b29b0a65b9591762ce5143ed30d0261e5d24a3201752506b20f15c")
				.unwrap();
		assert_eq!(foo.hash(), expected_hash);

		let other_hash = Hash::default();
		assert_eq!(
			foo.short_id(&other_hash, foo.0),
			ShortId::from_hex("4cc808b62476").unwrap()
		);

		let foo = Foo(5);
		let expected_hash =
			Hash::from_hex("3a42e66e46dd7633b57d1f921780a1ac715e6b93c19ee52ab714178eb3a9f673")
				.unwrap();
		assert_eq!(foo.hash(), expected_hash);

		let other_hash = Hash::default();
		assert_eq!(
			foo.short_id(&other_hash, foo.0),
			ShortId::from_hex("02955a094534").unwrap()
		);

		let foo = Foo(5);
		let expected_hash =
			Hash::from_hex("3a42e66e46dd7633b57d1f921780a1ac715e6b93c19ee52ab714178eb3a9f673")
				.unwrap();
		assert_eq!(foo.hash(), expected_hash);

		let other_hash =
			Hash::from_hex("81e47a19e6b29b0a65b9591762ce5143ed30d0261e5d24a3201752506b20f15c")
				.unwrap();
		assert_eq!(
			foo.short_id(&other_hash, foo.0),
			ShortId::from_hex("3e9cde72a687").unwrap()
		);
	}