Stabilize discovery workflow

tests/Discovery/TcpPortScannerTest.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Domovoy\Tests\Discovery;
+
+use Domovoy\Services\Discovery\TcpPortScanner;
+use PHPUnit\Framework\TestCase;
+
+final class TcpPortScannerTest extends TestCase
+{
+    public function testTimedOutConnectionIsNotReportedAsOpen(): void
+    {
+        $scanner = new TcpPortScanner();
+
+        $openPorts = $scanner->scan('10.255.255.1', [9100], 50, 1);
+
+        self::assertSame([], $openPorts);
+    }
+}