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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 StatefulMutator types
use qubit_function::{
ArcStatefulMutator,
BoxStatefulMutator,
MutatorOnce,
RcStatefulMutator,
StatefulMutator,
};
// ============================================================================
// BoxStatefulMutator Tests
// ============================================================================
#[cfg(test)]
mod test_conditional_execution {
use super::{
ArcStatefulMutator,
BoxStatefulMutator,
RcStatefulMutator,
StatefulMutator,
};
use qubit_function::predicates::{
ArcPredicate,
BoxPredicate,
RcPredicate,
};
// Helper function pointer for testing
fn is_positive(x: &i32) -> bool {
*x > 0
}
fn negate(x: &mut i32) {
*x = -*x;
}
// ========================================================================
// BoxStatefulMutator::when() tests
// ========================================================================
#[test]
fn test_rc_conditional_clone() {
let conditional = RcStatefulMutator::new(|x: &mut i32| *x *= 2)
.when(|x: &i32| *x > 0);
let mut clone1 = conditional.clone();
let mut clone2 = conditional.clone();
let mut value1 = 5;
clone1.apply(&mut value1);
assert_eq!(value1, 10);
let mut value2 = -5;
clone2.apply(&mut value2);
assert_eq!(value2, -5);
}
// ========================================================================
// ArcStatefulMutator::when() tests
// ========================================================================
#[test]
fn test_arc_when_with_closure() {
let conditional = ArcStatefulMutator::new(|x: &mut i32| *x *= 2)
.when(|x: &i32| *x > 0);
let mut m = conditional.clone();
let mut positive = 5;
m.apply(&mut positive);
assert_eq!(positive, 10);
let mut negative = -5;
m.apply(&mut negative);
assert_eq!(negative, -5);
}
#[test]
fn test_arc_when_with_function_pointer() {
let conditional = ArcStatefulMutator::new(|x: &mut i32| *x *= 2)
.when(is_positive as fn(&i32) -> bool);
let mut m = conditional.clone();
let mut positive = 5;
m.apply(&mut positive);
assert_eq!(positive, 10);
let mut negative = -5;
m.apply(&mut negative);
assert_eq!(negative, -5);
}
#[test]
fn test_arc_when_with_arc_predicate() {
let pred = ArcPredicate::new(|x: &i32| *x > 0);
let conditional =
ArcStatefulMutator::new(|x: &mut i32| *x *= 2).when(pred);
let mut m = conditional.clone();
let mut positive = 5;
m.apply(&mut positive);
assert_eq!(positive, 10);
let mut negative = -5;
m.apply(&mut negative);
assert_eq!(negative, -5);
}
// ========================================================================
// ArcConditionalStatefulMutator::or_else() tests
// ========================================================================
#[test]
fn test_arc_or_else_with_closure() {
let mut mutator = ArcStatefulMutator::new(|x: &mut i32| *x *= 2)
.when(|x: &i32| *x > 0)
.or_else(|x: &mut i32| *x -= 1);
let mut positive = 5;
mutator.apply(&mut positive);
assert_eq!(positive, 10);
let mut negative = -5;
mutator.apply(&mut negative);
assert_eq!(negative, -6);
}
#[test]
fn test_arc_or_else_with_function_pointer() {
let mut mutator = ArcStatefulMutator::new(|x: &mut i32| *x *= 2)
.when(|x: &i32| *x > 0)
.or_else(negate as fn(&mut i32));
let mut positive = 5;
mutator.apply(&mut positive);
assert_eq!(positive, 10);
let mut negative = -5;
mutator.apply(&mut negative);
assert_eq!(negative, 5);
}
#[test]
fn test_arc_or_else_with_arc_mutator() {
let else_mutator = ArcStatefulMutator::new(|x: &mut i32| *x = 100);
let mut mutator = ArcStatefulMutator::new(|x: &mut i32| *x *= 2)
.when(|x: &i32| *x > 0)
.or_else(else_mutator);
let mut positive = 5;
mutator.apply(&mut positive);
assert_eq!(positive, 10);
let mut negative = -5;
mutator.apply(&mut negative);
assert_eq!(negative, 100);
}
// Note: BoxStatefulMutator is not Send, so it cannot be used with
// ArcStatefulMutator::or_else()
// ========================================================================
// ArcConditionalStatefulMutator::clone() tests
// ========================================================================
#[test]
fn test_arc_conditional_clone() {
let conditional = ArcStatefulMutator::new(|x: &mut i32| *x *= 2)
.when(|x: &i32| *x > 0);
let mut clone1 = conditional.clone();
let mut clone2 = conditional.clone();
let mut value1 = 5;
clone1.apply(&mut value1);
assert_eq!(value1, 10);
let mut value2 = -5;
clone2.apply(&mut value2);
assert_eq!(value2, -5);
}
// ========================================================================
// Thread safety tests for ArcConditionalStatefulMutator
// ========================================================================
#[test]
fn test_arc_conditional_thread_safety() {
use std::thread;
let conditional = ArcStatefulMutator::new(|x: &mut i32| *x *= 2)
.when(|x: &i32| *x > 0);
let clone = conditional.clone();
let handle = thread::spawn(move || {
let mut value = 5;
let mut m = clone;
m.apply(&mut value);
value
});
let mut value = -5;
let mut m = conditional;
m.apply(&mut value);
assert_eq!(value, -5);
assert_eq!(handle.join().expect("thread should not panic"), 10);
}
#[test]
fn test_arc_or_else_thread_safety() {
use std::thread;
let mutator = ArcStatefulMutator::new(|x: &mut i32| *x *= 2)
.when(|x: &i32| *x > 0)
.or_else(|x: &mut i32| *x = 0);
let clone = mutator.clone();
let handle = thread::spawn(move || {
let mut value = -5;
let mut m = clone;
m.apply(&mut value);
value
});
let mut value = 5;
let mut m = mutator;
m.apply(&mut value);
assert_eq!(value, 10);
assert_eq!(handle.join().expect("thread should not panic"), 0);
}
// ========================================================================
// Type conversion tests for ConditionalStatefulMutator
// ========================================================================
// ========================================================================
// into_fn tests for ConditionalStatefulMutator
// ========================================================================
// ========================================================================
// to_xxx tests for RcConditionalStatefulMutator
// ========================================================================
// ========================================================================
// to_xxx tests for ArcConditionalStatefulMutator
// ========================================================================
// ========================================================================
// Complex conditional composition tests
// ========================================================================
#[test]
fn test_nested_conditionals() {
// When x > 0: multiply by 2, then if result > 10: cap at 10
let mut mutator = BoxStatefulMutator::new(|x: &mut i32| *x *= 2)
.when(|x: &i32| *x > 0)
.and_then(
BoxStatefulMutator::new(|x: &mut i32| *x = 10)
.when(|x: &i32| *x > 10),
);
let mut small = 3;
mutator.apply(&mut small);
assert_eq!(small, 6); // 3 * 2 = 6 (not capped)
let mut medium = 5;
mutator.apply(&mut medium);
assert_eq!(medium, 10); // 5 * 2 = 10 (not capped)
let mut large = 8;
mutator.apply(&mut large);
assert_eq!(large, 10); // 8 * 2 = 16 -> capped to 10
let mut negative = -5;
mutator.apply(&mut negative);
assert_eq!(negative, -5); // Not doubled (condition failed)
}
#[test]
fn test_or_else_chaining() {
// If positive: double, else: triple
let mut mutator = BoxStatefulMutator::new(|x: &mut i32| *x *= 2)
.when(|x: &i32| *x > 0)
.or_else(|x: &mut i32| *x *= 3);
let mut positive = 5;
mutator.apply(&mut positive);
assert_eq!(positive, 10);
let mut negative = -5;
mutator.apply(&mut negative);
assert_eq!(negative, -15);
let mut zero = 0;
mutator.apply(&mut zero);
assert_eq!(zero, 0); // 0 * 3
}
}
// ============================================================================
// Conditional Stateful Mutator Debug/Display Tests
// ============================================================================