<?php
/**
 * Copyright 2026 Kacper Donat
 *
 * @author Kacper "Kadet" Donat <kacper@kadet.net>
 *
 * Full license available in separate LICENSE file
 */

use Kadet\Functional as f;
use Kadet\Functional\Collections as c;
use Kadet\Functional\Predicates as p;

/**
 * The library's own callables (predicates, pipes, decorators) used as collection callbacks.
 */
class LibraryCallablesTest extends \PHPUnit\Framework\TestCase
{
    // negated predicates

    public function testFilterWithNegatedInternalFunction()
    {
        $this->assertSame([1 => 'x'], c\filter(f\not(is_numeric(...)))(['1', 'x']));
    }

    public function testFilterWithNegatedClosure()
    {
        $this->assertSame([1], c\filter(f\not(fn ($x) => $x > 1))([1, 2]));
    }

    public function testFilterWithNegatedPredicateMethod()
    {
        $this->assertSame([1], c\filter(p\gt(1)->not())([1, 2]));
    }

    public function testRejectWithNegatedPredicate()
    {
        $this->assertSame([1 => 2], c\reject(p\gt(1)->not())([1, 2]));
    }
}