qubit-executor 0.4.0

Executor abstractions, task handles, and basic executor implementations for Qubit Rust libraries
Documentation 
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/*******************************************************************************
 *
 *    Copyright (c) 2025 - 2026 Haixing Hu.
 *
 *    SPDX-License-Identifier: Apache-2.0
 *
 *    Licensed under the Apache License, Version 2.0.
 *
 ******************************************************************************/
use std::io;

use qubit_executor::{
    CancelResult,
    TaskExecutionError,
    TaskStatus,
    task::spi::TaskEndpointPair,
};

/// Test task completion start, completion, and cancellation races through public endpoints.
#[test]
fn test_task_slot_start_run_and_cancel_paths() {
    let (handle, completion) = TaskEndpointPair::<usize, io::Error>::new().into_parts();
    assert!(completion.run(|| Ok(42)));
    assert_eq!(
        handle.get().expect("completed task should return value"),
        42
    );

    let (handle, completion) = TaskEndpointPair::<usize, io::Error>::new().into_tracked_parts();
    assert_eq!(handle.cancel(), CancelResult::Cancelled);
    assert!(!completion.run(|| Ok(42)));
    assert!(matches!(handle.get(), Err(TaskExecutionError::Cancelled)));
}

/// Test explicitly starting a task slot returns a running slot that completes the task.
#[test]
fn test_task_slot_try_start_returns_running_slot() {
    let (handle, completion) = TaskEndpointPair::<usize, io::Error>::new().into_tracked_parts();

    completion.accept();
    let running = match completion.try_start() {
        Ok(running) => running,
        Err(_) => panic!("pending completion should start"),
    };

    assert_eq!(handle.status(), TaskStatus::Running);
    assert_eq!(handle.cancel(), CancelResult::AlreadyRunning);
    assert!(running.run(|| Ok(42)));
    assert_eq!(
        handle
            .get()
            .expect("running slot should publish callable result"),
        42,
    );
}

/// Test explicitly starting a cancelled slot fails without running user code.
#[test]
fn test_task_slot_try_start_returns_slot_when_cancelled() {
    let (handle, completion) = TaskEndpointPair::<usize, io::Error>::new().into_tracked_parts();

    completion.accept();
    assert_eq!(handle.cancel(), CancelResult::Cancelled);
    let completion = match completion.try_start() {
        Ok(_) => panic!("cancelled completion should not start"),
        Err(completion) => completion,
    };
    drop(completion);

    assert_eq!(handle.status(), TaskStatus::Cancelled);
    assert!(matches!(handle.get(), Err(TaskExecutionError::Cancelled)));
}

/// Test dropping a started running slot reports an abandoned runner endpoint.
#[test]
fn test_running_task_slot_drop_reports_dropped() {
    let (handle, completion) = TaskEndpointPair::<usize, io::Error>::new().into_tracked_parts();

    completion.accept();
    let running = match completion.try_start() {
        Ok(running) => running,
        Err(_) => panic!("pending completion should start"),
    };
    drop(running);

    assert_eq!(handle.status(), TaskStatus::Dropped);
    assert!(matches!(handle.get(), Err(TaskExecutionError::Dropped)));
}