1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
// =============================================================================
// 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_arc_stateful_mutating_function {
use super::{
ArcStatefulMutatingFunction,
StatefulMutatingFunction,
};
use std::thread;
#[test]
fn test_new() {
let mut counter = {
let mut count = 0;
ArcStatefulMutatingFunction::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;
ArcStatefulMutatingFunction::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_thread_safe() {
let counter = {
let mut count = 0;
ArcStatefulMutatingFunction::new(move |x: &mut i32| {
count += 1;
*x *= 2;
count
})
};
let mut counter_clone = counter.clone();
let handle = thread::spawn(move || {
let mut value = 5;
counter_clone.apply(&mut value)
});
let result = handle.join().expect("thread should not panic");
assert_eq!(result, 1);
}
#[test]
fn test_identity() {
let mut identity = ArcStatefulMutatingFunction::<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;
ArcStatefulMutatingFunction::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);
}
}
// ============================================================================
// Closure Tests
// ============================================================================