qubit-function 0.16.0

Functional programming traits and Box/Rc/Arc adapters for Rust, inspired by Java functional interfaces
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// =============================================================================
//    Copyright (c) 2025 - 2026 Haixing Hu.
//
//    SPDX-License-Identifier: Apache-2.0
//
//    Licensed under the Apache License, Version 2.0.
// =============================================================================

//! Unit tests for the predicate module.

use qubit_function::predicates::{
    ArcPredicate,
    BoxPredicate,
    Predicate,
    RcPredicate,
};
use std::cell::RefCell;
use std::sync::{
    Arc,
    Mutex,
};

struct PositivePredicate;

impl Predicate<i32> for PositivePredicate {
    fn test(&self, value: &i32) -> bool {
        *value > 0
    }
}

#[cfg(test)]
mod display_debug_tests {
    use super::{
        ArcPredicate,
        BoxPredicate,
        RcPredicate,
    };

    #[test]
    fn test_box_display_unnamed() {
        let pred = BoxPredicate::new(|x: &i32| *x > 0);
        let display_str = format!("{}", pred);
        assert_eq!(display_str, "BoxPredicate(unnamed)");
    }

    #[test]
    fn test_box_display_named() {
        let pred = BoxPredicate::new_with_name("is_positive", |x: &i32| *x > 0);
        let display_str = format!("{}", pred);
        assert_eq!(display_str, "BoxPredicate(is_positive)");
    }

    #[test]
    fn test_box_debug() {
        let pred = BoxPredicate::new(|x: &i32| *x > 0);
        let debug_str = format!("{:?}", pred);
        assert!(debug_str.contains("BoxPredicate"));
        assert!(debug_str.contains("name"));
    }

    #[test]
    fn test_arc_display_unnamed() {
        let pred = ArcPredicate::new(|x: &i32| *x > 0);
        let display_str = format!("{}", pred);
        assert_eq!(display_str, "ArcPredicate(unnamed)");
    }

    #[test]
    fn test_arc_display_named() {
        let pred = ArcPredicate::new_with_name("is_positive", |x: &i32| *x > 0);
        let display_str = format!("{}", pred);
        assert_eq!(display_str, "ArcPredicate(is_positive)");
    }

    #[test]
    fn test_arc_debug() {
        let pred = ArcPredicate::new(|x: &i32| *x > 0);
        let debug_str = format!("{:?}", pred);
        assert!(debug_str.contains("ArcPredicate"));
        assert!(debug_str.contains("name"));
    }

    #[test]
    fn test_rc_display_unnamed() {
        let pred = RcPredicate::new(|x: &i32| *x > 0);
        let display_str = format!("{}", pred);
        assert_eq!(display_str, "RcPredicate(unnamed)");
    }

    #[test]
    fn test_rc_display_named() {
        let pred = RcPredicate::new_with_name("is_positive", |x: &i32| *x > 0);
        let display_str = format!("{}", pred);
        assert_eq!(display_str, "RcPredicate(is_positive)");
    }

    #[test]
    fn test_rc_debug() {
        let pred = RcPredicate::new(|x: &i32| *x > 0);
        let debug_str = format!("{:?}", pred);
        assert!(debug_str.contains("RcPredicate"));
        assert!(debug_str.contains("name"));
    }
}
// ============================================================================
// Name Preservation Tests for into_xxx and to_xxx Methods
// ============================================================================