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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_box_mutating_function {
use super::{
BoxMutatingFunction,
MutatingFunction,
};
#[test]
fn test_new() {
let func = BoxMutatingFunction::new(|x: &mut i32| {
*x += 1;
*x
});
let mut value = 5;
assert_eq!(func.apply(&mut value), 6);
assert_eq!(value, 6);
}
#[test]
fn test_with_different_types() {
// String
let string_func = BoxMutatingFunction::new(|s: &mut String| {
let old_len = s.len();
s.push('!');
old_len
});
let mut text = String::from("hello");
assert_eq!(string_func.apply(&mut text), 5);
assert_eq!(text, "hello!");
// Vec
let vec_func = BoxMutatingFunction::new(|v: &mut Vec<i32>| {
let old_len = v.len();
v.push(42);
old_len
});
let mut numbers = vec![1, 2, 3];
assert_eq!(vec_func.apply(&mut numbers), 3);
assert_eq!(numbers, vec![1, 2, 3, 42]);
// bool
let bool_func = BoxMutatingFunction::new(|b: &mut bool| {
let old = *b;
*b = !*b;
old
});
let mut flag = true;
assert!(bool_func.apply(&mut flag));
assert!(!flag);
}
#[test]
fn test_and_then() {
let func = BoxMutatingFunction::new(|x: &mut i32| {
*x *= 2;
*x
})
.and_then(|x: &i32| *x + 10);
let mut value = 5;
let result = func.apply(&mut value);
assert_eq!(result, 20); // (5 * 2) + 10
assert_eq!(value, 10); // Input only modified by first function
}
#[test]
fn test_and_then_multiple_chains() {
let func = BoxMutatingFunction::new(|x: &mut i32| {
*x += 1;
*x
})
.and_then(|x: &i32| *x * 2)
.and_then(|x: &i32| *x - 5);
let mut value = 10;
assert_eq!(func.apply(&mut value), 17); // ((10 + 1) * 2) - 5
assert_eq!(value, 11); // Input only modified by first function
}
#[test]
fn test_identity() {
let identity = BoxMutatingFunction::<i32, i32>::identity();
let mut value = 42;
assert_eq!(identity.apply(&mut value), 42);
assert_eq!(value, 42);
}
#[test]
fn test_map() {
let func = BoxMutatingFunction::new(|x: &mut i32| {
*x *= 2;
*x
});
let mapped = func.and_then(|result: &i32| result.to_string());
let mut value = 5;
assert_eq!(mapped.apply(&mut value), "10");
assert_eq!(value, 10);
}
}
// ============================================================================
// RcMutatingFunction Tests
// ============================================================================