feat: show the travel name above the mailing list

tests/Service/TravelIndexTest.php

@@ -148,6 +148,44 @@ class TravelIndexTest extends TestCase
         $this->assertNull($result);
     }
 
+    // -------------------------------------------------------------------------
+    // mapDateCodeToLabel
+    // -------------------------------------------------------------------------
+
+    public function testMapDateCodeToLabelReturnsTheTravelLabel(): void
+    {
+        $this->travelLoader->method('generateFilesMap')->willReturn([
+            42 => ['id' => 42, 'code' => 'WI25', 'label' => 'Davos - Sportclub Waldschlössli - Wochenende', 'hotels' => []],
+        ]);
+        $this->travelSnapshotService->method('generateMapping')->willReturn([]);
+
+        $result = $this->service()->mapDateCodeToLabel('WI25');
+
+        $this->assertSame('Davos - Sportclub Waldschlössli - Wochenende', $result);
+    }
+
+    public function testMapDateCodeToLabelReturnsNullWhenNotFound(): void
+    {
+        $this->travelLoader->method('generateFilesMap')->willReturn([]);
+        $this->travelSnapshotService->method('generateMapping')->willReturn([]);
+
+        $result = $this->service()->mapDateCodeToLabel('UNKNOWN');
+
+        $this->assertNull($result);
+    }
+
+    public function testMapDateCodeToLabelReturnsNullWhenTheTravelHasNoLabel(): void
+    {
+        $this->travelLoader->method('generateFilesMap')->willReturn([
+            42 => ['id' => 42, 'code' => 'WI25', 'label' => null, 'hotels' => []],
+        ]);
+        $this->travelSnapshotService->method('generateMapping')->willReturn([]);
+
+        $result = $this->service()->mapDateCodeToLabel('WI25');
+
+        $this->assertNull($result);
+    }
+
     // -------------------------------------------------------------------------
     // mapHotelCodeToId
     // -------------------------------------------------------------------------