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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 MutatingFunction types (stateless Fn(&mut T) -> R)
use qubit_function::{
ArcMutatingFunction,
BoxMutatingFunction,
MutatingFunction,
MutatingFunctionOnce,
RcMutatingFunction,
};
// ============================================================================
// BoxMutatingFunction Tests
// ============================================================================
/// Test struct that implements MutatingFunction to test default methods
struct TestMutatingFunction {
multiplier: i32,
}
impl TestMutatingFunction {
fn new(multiplier: i32) -> Self {
TestMutatingFunction { multiplier }
}
}
impl MutatingFunction<i32, i32> for TestMutatingFunction {
fn apply(&self, input: &mut i32) -> i32 {
let old_value = *input;
*input *= self.multiplier;
old_value
}
}
impl Clone for TestMutatingFunction {
fn clone(&self) -> Self {
TestMutatingFunction {
multiplier: self.multiplier,
}
}
}
// ============================================================================
// MutatingFunction Debug and Display Tests
// ============================================================================
#[cfg(test)]
mod test_closure {
use super::{
MutatingFunction,
MutatingFunctionOnce,
};
#[test]
fn test_closure_implements_trait() {
let closure = |x: &mut i32| {
*x *= 2;
*x
};
let mut value = 5;
assert_eq!(closure.apply(&mut value), 10);
assert_eq!(value, 10);
}
}
// ============================================================================
// MutatingFunction Default Implementation Tests
// ============================================================================