65 lines
1.6 KiB
PHP
65 lines
1.6 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Tez\Utils\Tests\Arr;
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use PHPUnit\Framework\TestCase;
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use Tez\Utils\Arr\GroupBy;
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final class GroupByTest extends TestCase
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{
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public function testGroupsByStringKey(): void
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{
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$users = [
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['name' => 'Alice', 'role' => 'admin'],
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['name' => 'Bob', 'role' => 'user'],
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['name' => 'Carol', 'role' => 'admin'],
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];
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$result = GroupBy::group($users, fn($u) => $u['role']);
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self::assertSame([
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'admin' => [
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['name' => 'Alice', 'role' => 'admin'],
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['name' => 'Carol', 'role' => 'admin'],
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],
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'user' => [
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['name' => 'Bob', 'role' => 'user'],
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],
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], $result);
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}
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public function testGroupsByIntKey(): void
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{
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$result = GroupBy::group(range(1, 6), fn($n) => $n % 2);
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self::assertSame([
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1 => [1, 3, 5],
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0 => [2, 4, 6],
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], $result);
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}
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public function testGroupsPreserveDefinitionOrder(): void
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{
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$items = ['b', 'a', 'b', 'a', 'c'];
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$result = GroupBy::group($items, fn($v) => $v);
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self::assertSame(['b', 'b'], $result['b']);
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self::assertSame(['a', 'a'], $result['a']);
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self::assertSame(['c'], $result['c']);
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}
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public function testEmptyArrayReturnsEmpty(): void
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{
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self::assertSame([], GroupBy::group([], fn($v) => $v));
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}
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public function testSingleGroupWhenAllItemsShareKey(): void
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{
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$result = GroupBy::group([1, 2, 3], fn() => 'same');
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self::assertSame(['same' => [1, 2, 3]], $result);
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}
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}
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