fix: restore room occupancy lost to case-sensitive xml attribute lookup

tests/BusProNet/XmlParser/TravelParserTest.php

@@ -6,6 +6,7 @@ namespace App\Tests\BusProNet\XmlParser;
 
 use App\BusProNet\XmlCrawlerFactory;
 use App\BusProNet\XmlParser\TravelParser;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class TravelParserTest extends TestCase
@@ -426,4 +427,35 @@ class TravelParserTest extends TestCase
         $this->assertSame('2029-12-30 18:00', $pickups[1]->time->format('Y-m-d H:i'));
         $this->assertSame('2029-12-30 01:00', $pickups[2]->time->format('Y-m-d H:i'));
     }
+
+    /**
+     * The travel export writes MinPax/MaxPax capitalized while booking responses write them lowercase.
+     * XmlCrawlerFactory uses addXmlContent(), which makes attribute lookups case-sensitive, so both
+     * spellings have to resolve.
+     */
+    #[DataProvider('roomOccupancyAttributeProvider')]
+    public function testGetRoomsReadsOccupancyRegardlessOfAttributeCasing(string $attributes, ?int $expectedPax): void
+    {
+        $xml = sprintf('<?xml version="1.0" encoding="utf-8"?>
+<zimmer>
+    <preis zimmercode="4erDW" idbuspro_zimmer="95" zimmertext="4er Zimmer Dusche/WC" %s naechte="5" idbuspro_vp="2" preis="689,00" status="Frei" verfuegbar="8" />
+</zimmer>', $attributes);
+
+        $crawler = XmlCrawlerFactory::create($xml);
+        $rooms = $this->parser->getRooms($crawler->filterXPath('//zimmer')->first());
+
+        $this->assertArrayHasKey(95, $rooms);
+        $this->assertSame($expectedPax, $rooms[95]->minPax);
+        $this->assertSame($expectedPax, $rooms[95]->maxPax);
+    }
+
+    /**
+     * @return iterable<string, array{string, int|null}>
+     */
+    public static function roomOccupancyAttributeProvider(): iterable
+    {
+        yield 'export casing' => ['MinPax="4" MaxPax="4"', 4];
+        yield 'lowercase casing' => ['minpax="4" maxpax="4"', 4];
+        yield 'missing stays null' => ['', null];
+    }
 }