qubit-codec-misc 0.8.4

Miscellaneous byte and text format codecs for Rust applications
Documentation 
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// =============================================================================
//    Copyright (c) 2026 Haixing Hu.
//
//    SPDX-License-Identifier: Apache-2.0
//
//    Licensed under the Apache License, Version 2.0.
// =============================================================================
//! Tests for the low-level hexadecimal byte codec.

use qubit_codec::Codec;
use qubit_codec_misc::HexByteCodec;
use qubit_codec_misc::MiscCodecError;

use crate::invalid_consumed;
use crate::invalid_source;

#[test]
fn test_hex_byte_codec_roundtrips_one_byte() {
    let mut codec = HexByteCodec::upper();
    let mut output = [0u8; 2];

    let (decoded, consumed) = unsafe { Codec::decode(&mut codec, b"Af", 0).expect("single hex byte should decode") };
    let written = unsafe { Codec::encode(&mut codec, &0xaf, &mut output, 0).expect("single hex byte should encode") };

    assert_eq!(0xaf, decoded);
    assert_eq!(2, consumed.get());
    assert_eq!(2, written);
    assert_eq!(b"AF", &output);
    assert_eq!(2, <HexByteCodec as Codec>::MIN_UNITS_PER_VALUE);
    assert_eq!(2, <HexByteCodec as Codec>::MAX_ENCODE_UNITS_PER_VALUE);
    assert_eq!(2, <HexByteCodec as Codec>::MAX_DECODE_UNITS_PER_VALUE);
    assert!(codec.is_uppercase());
    assert!(!HexByteCodec::upper().with_uppercase(false).is_uppercase());
}

#[test]
fn test_hex_byte_codec_reports_digit_positions() {
    let mut codec = HexByteCodec::new();
    let high_consumed = unsafe { Codec::decode(&mut codec, b"xf", 0) }.expect_err("invalid high hex digit should fail");
    let low_consumed = unsafe { Codec::decode(&mut codec, b"fx", 0) }.expect_err("invalid low hex digit should fail");
    let high_source = unsafe { Codec::decode(&mut codec, b"xf", 0) }.expect_err("invalid high hex digit should fail");
    let low_source = unsafe { Codec::decode(&mut codec, b"fx", 0) }.expect_err("invalid low hex digit should fail");

    assert_eq!(Some(2), invalid_consumed(high_consumed));
    assert_eq!(Some(2), invalid_consumed(low_consumed));

    assert!(matches!(
        invalid_source(high_source),
        MiscCodecError::InvalidDigit {
            radix: 16,
            index: 0,
            character: 'x'
        }
    ));
    assert!(matches!(
        invalid_source(low_source),
        MiscCodecError::InvalidDigit {
            radix: 16,
            index: 1,
            character: 'x'
        }
    ));
}