qubit-batch 0.4.2

One-shot batch execution and processing with sequential and scoped parallel utilities
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.
 *
 ******************************************************************************/
//! Integration tests for [`BatchExecutor::call`](qubit_batch::BatchExecutor::call)
//! and the internal callable runnable wrapper.

use qubit_batch::{
    BatchExecutionError,
    BatchExecutor,
    ParallelBatchExecutor,
    SequentialBatchExecutor,
};

use crate::support::TestCallable;

#[test]
fn test_sequential_batch_executor_calls_callables_and_collects_values() {
    let executor = SequentialBatchExecutor::new();
    let tasks = vec![
        TestCallable::returning(10),
        TestCallable::returning(20),
        TestCallable::returning(30),
    ];

    let result = executor.call(tasks, 3).expect("call batch should succeed");

    assert_eq!(result.outcome().completed_count(), 3);
    assert_eq!(result.values(), &[Some(10), Some(20), Some(30)]);
    assert_eq!(result.into_values(), vec![Some(10), Some(20), Some(30)]);

    let tasks = vec![TestCallable::returning(40)];
    let result = executor.call(tasks, 1).expect("call batch should succeed");
    assert_eq!(result.into_outcome().completed_count(), 1);

    let tasks = vec![TestCallable::returning(50)];
    let result = executor.call(tasks, 1).expect("call batch should succeed");
    let (outcome, values) = result.into_parts();
    assert_eq!(outcome.completed_count(), 1);
    assert_eq!(values, vec![Some(50)]);
}

#[test]
fn test_sequential_batch_executor_call_preserves_failure_indexes() {
    let executor = SequentialBatchExecutor::new();
    let tasks = vec![
        TestCallable::returning(10),
        TestCallable::fail("failed"),
        TestCallable::panic("panic in callable"),
        TestCallable::returning(40),
    ];

    let result = executor
        .call(tasks, 4)
        .expect("callable failures should stay in the batch result");

    assert_eq!(result.values(), &[Some(10), None, None, Some(40)]);
    assert_eq!(result.outcome().failed_count(), 1);
    assert_eq!(result.outcome().panicked_count(), 1);
    assert_eq!(result.outcome().failures()[0].index(), 1);
    assert_eq!(result.outcome().failures()[1].index(), 2);
}

#[test]
fn test_sequential_batch_executor_call_collects_many_values_by_index() {
    const COUNT: usize = 2048;

    let executor = SequentialBatchExecutor::new();
    let tasks = (0..COUNT)
        .map(|index| TestCallable::returning(index as i32))
        .collect::<Vec<_>>();

    let result = executor
        .call(tasks, COUNT)
        .expect("large callable batch should succeed");

    assert_eq!(result.outcome().completed_count(), COUNT);
    assert_eq!(result.values().len(), COUNT);
    for (index, value) in result.values().iter().enumerate() {
        assert_eq!(*value, Some(index as i32));
    }
}

#[test]
fn test_parallel_batch_executor_call_collects_values_by_index() {
    let executor = ParallelBatchExecutor::builder()
        .thread_count(2)
        .sequential_threshold(0)
        .build()
        .expect("parallel executor should build");
    let tasks = vec![
        TestCallable::returning(10),
        TestCallable::fail("failed"),
        TestCallable::panic("panic in callable"),
        TestCallable::returning(40),
    ];

    let result = executor
        .call(tasks, 4)
        .expect("callable failures should stay in the batch result");

    assert_eq!(result.values(), &[Some(10), None, None, Some(40)]);
    assert_eq!(result.outcome().completed_count(), 4);
    assert_eq!(result.outcome().failed_count(), 1);
    assert_eq!(result.outcome().panicked_count(), 1);
    assert_eq!(result.outcome().failures()[0].index(), 1);
    assert_eq!(result.outcome().failures()[1].index(), 2);
}

#[test]
fn test_parallel_batch_executor_call_reports_count_mismatches() {
    let executor = ParallelBatchExecutor::builder()
        .thread_count(2)
        .sequential_threshold(0)
        .build()
        .expect("parallel executor should build");

    let shortfall = executor
        .call(vec![TestCallable::returning(10)], 2)
        .expect_err("call shortfall should be reported");
    match shortfall {
        BatchExecutionError::CountShortfall {
            expected,
            actual,
            outcome,
        } => {
            assert_eq!(expected, 2);
            assert_eq!(actual, 1);
            assert_eq!(outcome.completed_count(), 1);
        }
        other => panic!("unexpected error: {other:?}"),
    }

    let exceeded = executor
        .call(
            vec![
                TestCallable::returning(10),
                TestCallable::returning(20),
                TestCallable::returning(30),
            ],
            2,
        )
        .expect_err("call overflow should be reported");
    match exceeded {
        BatchExecutionError::CountExceeded {
            expected,
            observed_at_least,
            outcome,
        } => {
            assert_eq!(expected, 2);
            assert_eq!(observed_at_least, 3);
            assert_eq!(outcome.completed_count(), 2);
        }
        other => panic!("unexpected error: {other:?}"),
    }
}