fix: skip travels whose hotel is missing from the master data

tests/BusProNet/XmlLoader/TravelLoaderFilesMapTest.php

@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\BusProNet\XmlLoader;
+
+use App\BusProNet\Model\Hotel;
+use App\BusProNet\XmlLoader\HotelLoader;
+use App\BusProNet\XmlLoader\TravelLoader;
+use App\BusProNet\XmlParser\TravelParser;
+use League\Flysystem\DirectoryListing;
+use League\Flysystem\FileAttributes;
+use League\Flysystem\FilesystemOperator;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+use Symfony\Component\Cache\Adapter\TagAwareAdapter;
+
+class TravelLoaderFilesMapTest extends TestCase
+{
+    private const XML = '<?xml version="1.0" encoding="utf-8"?>
+<reisen>
+ <reise code="SBW">
+  <termin idbuspro="900" code="SBW250101" termin="01.01.2025" bis="08.01.2025">
+   <text>Skiwoche</text>
+   <hotel idbuspro="1" code="KNOWN"/>
+   <hotel idbuspro="999" code="GHOST"/>
+  </termin>
+ </reise>
+</reisen>';
+
+    /**
+     * A travel may reference a hotel id that hotel.xml does not carry. Before the guard the
+     * miss was dereferenced, which fataled the whole cached mapping rather than one entry --
+     * so /api/travels went down entirely, not just the affected travel.
+     */
+    public function testGenerateFilesMapSkipsHotelsMissingFromMasterData(): void
+    {
+        $known = new Hotel();
+        $known->id = 1;
+        $known->name = 'Hotel Bekannt';
+
+        $hotelLoader = $this->createStub(HotelLoader::class);
+        $hotelLoader->method('loadAll')->willReturn([1 => $known]);
+
+        $filesystem = $this->createStub(FilesystemOperator::class);
+        $filesystem->method('listContents')->willReturn(
+            new DirectoryListing([new FileAttributes('Ziel_1.xml')])
+        );
+        $filesystem->method('read')->willReturn(self::XML);
+
+        $loader = new TravelLoader(
+            $hotelLoader,
+            $this->createStub(TravelParser::class),
+            'https://example.test',
+            new TagAwareAdapter(new ArrayAdapter()),
+            $filesystem,
+        );
+
+        $mapping = $loader->generateFilesMap();
+
+        $this->assertArrayHasKey(900, $mapping);
+        $this->assertSame([1], array_keys($mapping[900]['hotels']));
+        $this->assertSame('Hotel Bekannt', $mapping[900]['hotels'][1]['label']);
+    }
+}