qubit-codec 0.16.1

Core codec traits and buffer conversion primitives for Rust
Documentation 
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// =============================================================================
//    Copyright (c) 2026 Haixing Hu.
//
//    SPDX-License-Identifier: Apache-2.0
//
//    Licensed under the Apache License, Version 2.0.
// =============================================================================

use qubit_codec::TranscodeContractError;
use qubit_codec::TranscodeProgress;
use qubit_codec::TranscodeStatus;

#[test]
fn test_transcoder_progress_exposes_status_and_counts() {
    let complete = TranscodeProgress::complete(2, 3);
    assert_eq!(TranscodeStatus::Complete, complete.status());
    assert_eq!(2, complete.read());
    assert_eq!(3, complete.written());

    let status = TranscodeStatus::NeedInput {
        required: crate::nonzero(1),
    };
    assert!(matches!(
        TranscodeProgress::new(status, 1, 1).status(),
        TranscodeStatus::NeedInput { .. },
    ));
    let status = TranscodeStatus::NeedInput {
        required: crate::nonzero(3),
    };
    let need_input = TranscodeProgress::new(status, 1, 2);
    assert_eq!(TranscodeStatus::need_input(crate::nonzero(3)), need_input.status());
    assert_eq!(1, need_input.read());
    assert_eq!(2, need_input.written());

    let status = TranscodeStatus::NeedOutput {
        required: crate::nonzero(1),
    };
    assert!(matches!(
        TranscodeProgress::new(status, 1, 0).status(),
        TranscodeStatus::NeedOutput { .. },
    ));
    let status = TranscodeStatus::NeedOutput {
        required: crate::nonzero(8),
    };
    let need_output = TranscodeProgress::new(status, 5, 6);
    assert_eq!(TranscodeStatus::need_output(crate::nonzero(8)), need_output.status());
    assert_eq!(5, need_output.read());
    assert_eq!(6, need_output.written());
}

#[test]
fn test_transcoder_progress_constructors_create_expected_progress() {
    let need_input = TranscodeProgress::need_input(crate::nonzero(2), 5, 6);
    assert_eq!(TranscodeStatus::need_input(crate::nonzero(2)), need_input.status());
    assert_eq!(5, need_input.read());
    assert_eq!(6, need_input.written());

    let need_output = TranscodeProgress::need_output(crate::nonzero(3), 8, 9);
    assert_eq!(TranscodeStatus::need_output(crate::nonzero(3)), need_output.status());
    assert_eq!(8, need_output.read());
    assert_eq!(9, need_output.written());
}

#[test]
fn test_transcoder_progress_predicates_match_status() {
    let complete = TranscodeProgress::complete(2, 3);
    assert!(complete.is_complete());
    assert!(!complete.is_need_input());
    assert!(!complete.is_need_output());

    let need_input = TranscodeProgress::need_input(crate::nonzero(2), 5, 6);
    assert!(!need_input.is_complete());
    assert!(need_input.is_need_input());
    assert!(!need_input.is_need_output());

    let need_output = TranscodeProgress::need_output(crate::nonzero(3), 8, 9);
    assert!(!need_output.is_complete());
    assert!(!need_output.is_need_input());
    assert!(need_output.is_need_output());
}

#[test]
fn test_transcoder_progress_validate_accepts_consistent_progress() {
    let complete = TranscodeProgress::complete(2, 3);
    assert_eq!(Ok(()), complete.validate(10, 2, 20, 3));

    let need_input = TranscodeProgress::need_input(crate::nonzero(4), 2, 3);
    assert_eq!(Ok(()), need_input.validate(10, 3, 20, 5));

    let need_output = TranscodeProgress::need_output(crate::nonzero(4), 2, 3);
    assert_eq!(Ok(()), need_output.validate(10, 4, 20, 4));
}

#[test]
fn test_transcoder_progress_validate_rejects_counter_bounds() {
    let progress = TranscodeProgress::complete(3, 1);
    assert_eq!(
        Err(TranscodeContractError::OverRead { read: 3, available: 2 }),
        progress.validate(0, 2, 0, 1),
    );

    let progress = TranscodeProgress::complete(1, 3);
    assert_eq!(
        Err(TranscodeContractError::OverWritten {
            written: 3,
            available: 2,
        }),
        progress.validate(0, 1, 0, 2),
    );
}

#[test]
fn test_transcoder_progress_validate_rejects_incomplete_complete() {
    let progress = TranscodeProgress::complete(1, 1);

    assert_eq!(
        Err(TranscodeContractError::CompleteWithRemainingInput { read: 1, available: 2 }),
        progress.validate(0, 2, 0, 2),
    );
}

#[test]
fn test_transcoder_progress_validate_ignores_redundant_status_indices() {
    let need_input = TranscodeProgress::need_input(crate::nonzero(3), 2, 0);
    assert_eq!(Ok(()), need_input.validate(10, 3, 20, 0),);
}

#[test]
fn test_transcoder_progress_validate_rejects_satisfied_requirements() {
    let need_input = TranscodeProgress::need_input(crate::nonzero(1), 2, 0);
    assert_eq!(
        Err(TranscodeContractError::SatisfiedNeed {
            required: 1,
            available: 1,
        }),
        need_input.validate(10, 3, 20, 0),
    );

    let need_output = TranscodeProgress::need_output(crate::nonzero(1), 0, 3);
    assert_eq!(
        Err(TranscodeContractError::SatisfiedNeed {
            required: 1,
            available: 1,
        }),
        need_output.validate(10, 0, 20, 4),
    );
}

#[test]
fn test_transcoder_progress_validate_derives_available_capacity() {
    let need_input = TranscodeProgress::need_input(crate::nonzero(4), 2, 0);
    assert_eq!(Ok(()), need_input.validate(10, 3, 20, 0));

    let need_output = TranscodeProgress::need_output(crate::nonzero(4), 0, 3);
    assert_eq!(Ok(()), need_output.validate(10, 0, 20, 4));
}

#[test]
fn test_transcoder_progress_validate_rejects_index_overflow() {
    let need_input = TranscodeProgress::need_input(crate::nonzero(2), 1, 0);
    assert_eq!(
        Err(TranscodeContractError::ProgressIndexOverflow {
            index: usize::MAX,
            advanced: 1,
        }),
        need_input.validate(usize::MAX, 1, 0, 0),
    );

    let need_output = TranscodeProgress::need_output(crate::nonzero(2), 0, 1);
    assert_eq!(
        Err(TranscodeContractError::ProgressIndexOverflow {
            index: usize::MAX,
            advanced: 1,
        }),
        need_output.validate(0, 0, usize::MAX, 1),
    );
}