<?php

declare(strict_types=1);

namespace Recruiter\Array\Tests;

use PHPUnit\Framework\TestCase;

use function Recruiter\Array\array_group_by;

class ArrayGroupByTest extends TestCase

{

public function testArrayGroupBy(): void

{

$this->assertSame([], array_group_by([]));

$this->assertSame(

[

1 => [1],

2 => [2, 2],

3 => [3, 3],

4 => [4],

],

array_group_by([1, 2, 2, 3, 3, 4]),

);

$this->assertSame(

[

1 => [1, 3, 5],

0 => [2, 4, 6],

],

array_group_by(

[1, 2, 3, 4, 5, 6],

fn ($n): int => $n % 2,

),

);

}

public function testIterator(): void

{

$this->assertSame(

[

1 => [1],

2 => [2, 2],

3 => [3, 3],

4 => [4],

],

array_group_by(new \ArrayIterator([1, 2, 2, 3, 3, 4])),

);

}

}