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// =============================================================================
// Copyright (c) 2025 - 2026 Haixing Hu.
//
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0.
// =============================================================================
//! Comprehensive tests for FunctionOnce trait and BoxFunctionOnce
// ============================================================================
// FunctionOnce Trait Tests - Core Functionality
// ============================================================================
#[cfg(test)]
mod function_once_default_impl_tests {
use qubit_function::BoxFunctionOnce;
use qubit_function::FunctionOnce;
/// Cloneable custom one-time function for testing to_xxx_once() methods
#[derive(Clone)]
struct CloneableCustomFunctionOnce {
multiplier: i32,
}
impl FunctionOnce<i32, i32> for CloneableCustomFunctionOnce {
fn apply(self, input: &i32) -> i32 {
input * self.multiplier
}
// Does not override any to_xxx_once() methods, testing default
// implementations
}
#[test]
fn test_custom_with_captured_value() {
let captured = [1, 2, 3];
let custom = CloneableCustomFunctionOnce { multiplier: 2 };
let func = BoxFunctionOnce::new(move |x: &i32| {
let base = custom.apply(x);
base + captured.len() as i32
});
assert_eq!(func.apply(&10), 23); // 10 * 2 + 3
}
}
// ============================================================================
// FunctionOnce Debug and Display Tests
// ============================================================================