qubit-value 0.12.2

Type-safe containers for single, multi-valued, and named runtime values
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::error::Error;

use qubit_datatype::DataConversionError;
use qubit_datatype::DataListConversionError;
use qubit_datatype::DataType;
use qubit_datatype::InvalidValueReason;
use qubit_value::ValueError;
use qubit_value::ValueMissing;
use qubit_value::ValueMissingReason;

#[test]
fn test_missing_error_exposes_default_semantics() {
    let error = ValueError::from(DataConversionError::missing(DataType::String, DataType::Int32));
    assert!(error.is_missing());
    let missing = error.missing().unwrap();
    assert_eq!(missing.source_type(), Some(DataType::String));
    assert_eq!(missing.target_type(), Some(DataType::Int32));
    assert!(missing.is_defaultable_for_conversion());
    assert!(!missing.is_defaultable_for_strict_read());
}

#[test]
fn test_value_error_display_includes_context() {
    let mismatch = ValueError::TypeMismatch {
        expected: DataType::String,
        actual: DataType::Int32,
    };
    assert_eq!(mismatch.to_string(), "Type mismatch: expected string, actual int32");
}

#[test]
fn test_value_error_variants_compare_by_payload() {
    assert_eq!(
        ValueError::Missing(ValueMissing::unset_scalar(DataType::String, DataType::String)),
        ValueError::Missing(ValueMissing::unset_scalar(DataType::String, DataType::String)),
    );
    let source = DataConversionError::invalid(DataType::String, DataType::Int32, InvalidValueReason::OutOfRange);
    let single = ValueError::Conversion(source.clone());
    assert_eq!(single.source().and_then(|error| error.downcast_ref()), Some(&source),);

    let list_source = DataListConversionError::new(2, source);
    let list = ValueError::ListConversion(list_source.clone());
    assert_eq!(list.source().and_then(|error| error.downcast_ref()), Some(&list_source),);
}

#[test]
fn test_value_missing_preserves_shape_state_and_declared_type() {
    let scalar = ValueMissing::unset_scalar(DataType::Int32, DataType::Int32);
    let collection = ValueMissing::unset_collection(DataType::String, DataType::String);
    let empty = ValueMissing::empty_collection(DataType::UInt64, DataType::UInt64);

    assert_eq!(scalar.source_type(), Some(DataType::Int32));
    assert!(scalar.is_unset());
    assert!(!scalar.is_empty_collection());
    assert_eq!(collection.source_type(), Some(DataType::String));
    assert!(collection.is_unset());
    assert!(!collection.is_empty_collection());
    assert_eq!(empty.source_type(), Some(DataType::UInt64));
    assert!(!empty.is_unset());
    assert!(empty.is_empty_collection());
}

#[test]
fn test_value_missing_preserves_collection_item_context() {
    let error = ValueError::from(DataListConversionError::new(
        4,
        DataConversionError::missing(DataType::String, DataType::Int32),
    ));
    let missing = error.missing().unwrap();
    assert_eq!(missing.source_index(), Some(4));
    assert_eq!(missing.source_type(), Some(DataType::String));
    assert_eq!(missing.target_type(), Some(DataType::Int32));
    assert!(missing.is_conversion());
    assert!(!missing.is_defaultable_for_conversion());
}

#[test]
fn test_conversion_missing_errors_are_promoted_to_value_missing() {
    let scalar = ValueError::from(DataConversionError::missing(DataType::String, DataType::Int32));
    let missing = scalar.missing().unwrap();
    assert_eq!(missing.reason(), ValueMissingReason::Conversion);
    assert_eq!(missing.source_type(), Some(DataType::String));
    assert_eq!(missing.target_type(), Some(DataType::Int32));
    let empty = ValueError::from(DataConversionError::empty_collection(DataType::Int32));
    let missing = empty.missing().unwrap();
    assert!(missing.is_empty_collection());
    assert_eq!(missing.source_type(), None);
    assert_eq!(missing.target_type(), Some(DataType::Int32));
    let list = ValueError::from(DataListConversionError::new(
        3,
        DataConversionError::missing(DataType::String, DataType::Int32),
    ));
    let missing = list.missing().unwrap();
    assert_eq!(missing.reason(), ValueMissingReason::Conversion);
    assert_eq!(missing.source_index(), Some(3));
    assert_eq!(missing.target_type(), Some(DataType::Int32));
}

#[test]
fn test_value_error_clone_preserves_structured_source() {
    let source = DataConversionError::invalid(DataType::String, DataType::Int32, InvalidValueReason::OutOfRange);
    let error = ValueError::ListConversion(DataListConversionError::new(3, source));

    assert_eq!(error.clone(), error);
}

#[test]
fn test_value_error_accessors_cover_non_missing_variants() {
    let mismatch = ValueError::TypeMismatch {
        expected: DataType::String,
        actual: DataType::Int32,
    };
    assert!(!mismatch.is_missing());
    assert_eq!(mismatch.missing(), None);

    let conversion = ValueError::Conversion(DataConversionError::invalid(
        DataType::String,
        DataType::Int32,
        InvalidValueReason::OutOfRange,
    ));
    assert!(!conversion.is_missing());
    assert_eq!(conversion.missing(), None);

    let list = ValueError::ListConversion(DataListConversionError::new(
        0,
        DataConversionError::invalid(DataType::String, DataType::Int32, InvalidValueReason::OutOfRange),
    ));
    assert!(!list.is_missing());
    assert_eq!(list.missing(), None);
}