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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 custom_predicate_tests {
use super::Predicate;
// Custom predicate struct that only implements the test method,
// relying on default implementations for into_xxx methods.
struct ThresholdPredicate {
threshold: i32,
}
impl Predicate<i32> for ThresholdPredicate {
fn test(&self, value: &i32) -> bool {
*value > self.threshold
}
// All into_xxx methods use default implementations
}
#[test]
fn test_custom_predicate_test() {
let pred = ThresholdPredicate { threshold: 10 };
assert!(pred.test(&15));
assert!(pred.test(&100));
assert!(!pred.test(&10));
assert!(!pred.test(&5));
assert!(!pred.test(&-5));
}
// Custom predicate with generic type parameter
struct LengthPredicate {
min_length: usize,
}
impl Predicate<String> for LengthPredicate {
fn test(&self, value: &String) -> bool {
value.len() >= self.min_length
}
}
#[test]
fn test_generic_custom_predicate() {
let pred = LengthPredicate { min_length: 5 };
assert!(pred.test(&"hello".to_string()));
assert!(pred.test(&"world!".to_string()));
assert!(!pred.test(&"hi".to_string()));
assert!(!pred.test(&"".to_string()));
}
}
// ============================================================================
// Display and Debug Tests
// ============================================================================