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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 StatefulMutatingFunction types (stateful FnMut(&mut T) ->
//! R)
use qubit_function::{
ArcStatefulMutatingFunction,
BoxStatefulMutatingFunction,
MutatingFunctionOnce,
RcStatefulMutatingFunction,
StatefulMutatingFunction,
};
use std::cell::RefCell;
use std::rc::Rc;
// ============================================================================
// StatefulMutatingFunction Default Implementation Tests
// ============================================================================
/// Test struct that implements StatefulMutatingFunction to test default methods
struct TestStatefulMutatingFunction {
multiplier: i32,
}
impl TestStatefulMutatingFunction {
fn new(multiplier: i32) -> Self {
TestStatefulMutatingFunction { multiplier }
}
}
impl StatefulMutatingFunction<i32, i32> for TestStatefulMutatingFunction {
fn apply(&mut self, input: &mut i32) -> i32 {
let old_value = *input;
*input *= self.multiplier;
old_value
}
}
impl Clone for TestStatefulMutatingFunction {
fn clone(&self) -> Self {
TestStatefulMutatingFunction {
multiplier: self.multiplier,
}
}
}
// ============================================================================
// BoxStatefulMutatingFunction Tests
// ============================================================================
#[cfg(test)]
mod test_rc_stateful_mutating_function {
use super::{
RcStatefulMutatingFunction,
StatefulMutatingFunction,
};
#[test]
fn test_new() {
let mut counter = {
let mut count = 0;
RcStatefulMutatingFunction::new(move |x: &mut i32| {
count += 1;
*x += 1;
count
})
};
let mut value = 5;
assert_eq!(counter.apply(&mut value), 1);
assert_eq!(value, 6);
assert_eq!(counter.apply(&mut value), 2);
assert_eq!(value, 7);
}
#[test]
fn test_clone() {
let counter = {
let mut count = 0;
RcStatefulMutatingFunction::new(move |x: &mut i32| {
count += 1;
*x *= 2;
count
})
};
let mut clone = counter.clone();
let mut value1 = 5;
assert_eq!(clone.apply(&mut value1), 1);
assert_eq!(value1, 10);
// Shared state
let mut value2 = 3;
assert_eq!(clone.apply(&mut value2), 2);
assert_eq!(value2, 6);
}
#[test]
fn test_identity() {
let mut identity = RcStatefulMutatingFunction::<i32, i32>::identity();
let mut value = 42;
assert_eq!(identity.apply(&mut value), 42);
assert_eq!(value, 42);
}
#[test]
fn test_map() {
let func = {
let mut count = 0;
RcStatefulMutatingFunction::new(move |x: &mut i32| {
count += 1;
*x *= 2;
count
})
};
let mut mapped = func
.and_then::<String, _>(|count: &i32| format!("Call #{}", *count));
let mut value = 5;
assert_eq!(mapped.apply(&mut value), "Call #1");
assert_eq!(value, 10);
}
}
// ============================================================================
// ArcStatefulMutatingFunction Tests
// ============================================================================