qubit-function 0.18.2

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::Predicate;
use qubit_function::predicates::RcPredicate;

#[test]
fn test_new() {
    let pred = RcPredicate::new(|x: &i32| *x > 0);
    assert!(pred.test(&5));
    assert!(!pred.test(&-3));
}

#[test]
fn test_new_with_name() {
    let pred = RcPredicate::new_with_name("is_positive", |x: &i32| *x > 0);
    assert_eq!(pred.name(), Some("is_positive"));
    assert!(pred.test(&5));
}

#[test]
fn test_set_name() {
    let mut pred = RcPredicate::new(|x: &i32| *x > 0);
    assert_eq!(pred.name(), None);
    pred.set_name("is_positive");
    assert_eq!(pred.name(), Some("is_positive"));
    assert!(pred.test(&5));
}

#[test]
fn test_clone() {
    let pred = RcPredicate::new(|x: &i32| *x > 0);
    let pred_clone = pred.clone();

    assert!(pred.test(&5));
    assert!(pred_clone.test(&5));
    assert!(!pred_clone.test(&-3));
}

#[test]
fn test_and_composition() {
    let pred1 = RcPredicate::new(|x: &i32| *x > 0);
    let pred2 = RcPredicate::new(|x: &i32| x % 2 == 0);

    let combined = pred1.and(pred2.clone());

    // Original predicates are still usable
    assert!(pred1.test(&5));
    assert!(pred2.test(&4));

    // Combined predicate works correctly
    assert!(combined.test(&4));
    assert!(!combined.test(&3));
}

#[test]
fn test_or_composition() {
    let pred1 = RcPredicate::new(|x: &i32| *x < 0);
    let pred2 = RcPredicate::new(|x: &i32| x % 2 == 0);

    let combined = pred1.or(pred2.clone());

    // Original predicates are still usable
    assert!(pred1.test(&-5));
    assert!(pred2.test(&4));

    // Combined predicate works correctly
    assert!(combined.test(&-5));
    assert!(combined.test(&4));
    assert!(!combined.test(&3));
}

#[test]
fn test_not_composition() {
    let pred = RcPredicate::new(|x: &i32| *x > 0);
    let negated = !&pred;

    // Original predicate is still usable
    assert!(pred.test(&5));

    // Negated predicate works correctly
    assert!(!negated.test(&5));
    assert!(negated.test(&-3));
}

#[test]
fn test_complex_reuse() {
    let positive = RcPredicate::new(|x: &i32| *x > 0);
    let even = RcPredicate::new(|x: &i32| x % 2 == 0);

    let combined1 = positive.and(even.clone());
    let combined2 = positive.or(even.clone());

    // All predicates are still usable
    assert!(positive.test(&5));
    assert!(even.test(&4));
    assert!(combined1.test(&4));
    assert!(combined2.test(&5));
}