fix: entityExtant()

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

tests/php/Unit/ServiceTest.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace KTXT\ProviderImap\Tests\Unit;
+
+use KTXM\ProviderImap\Providers\Service;
+use KTXM\ProviderImap\Service\Remote\RemoteMailService;
+use PHPUnit\Framework\TestCase;
+use ReflectionProperty;
+
+final class ServiceTest extends TestCase
+{
+    public function testEntityExtantReportsExistenceOfEachIdentifier(): void
+    {
+        $service = new Service();
+        $remote = new ServiceTestRemoteStub($this->createStub(Service::class));
+        $remote->existing = [5];
+        (new ReflectionProperty(Service::class, 'remoteService'))->setValue($service, $remote);
+
+        $result = $service->entityExtant('INBOX', 5, '6', 'abc', 0);
+
+        $this->assertSame([5 => true, 6 => false, 'abc' => false, 0 => false], $result);
+        $this->assertSame([['INBOX', [5, 6]]], $remote->extantCalls);
+    }
+}
+
+final class ServiceTestRemoteStub extends RemoteMailService
+{
+    /** @var int[] */
+    public array $existing = [];
+    public array $extantCalls = [];
+
+    public function entityExtant(string $collection, int ...$uids): array
+    {
+        $this->extantCalls[] = [$collection, $uids];
+        return array_values(array_intersect($uids, $this->existing));
+    }
+}