账单导出

tests/Feature/ContainerReturnTest.php

@@ -13,6 +13,7 @@ use App\Models\StoreOrderModel;
 use Illuminate\Support\Facades\DB;
 use Maatwebsite\Excel\Facades\Excel;
 use Modules\SystemTool\Services\SysSiteConfigService;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
 
 /**
  * 压回筐记录：周转筐/托盘跟账单走（生成账单时写入完整快照，只读）；
@@ -243,6 +244,22 @@ class ContainerReturnTest extends ProcurementTestCase
         );
     }
 
+    /** 汇总导出标题按日期、门店及合计列的总宽度合并 */
+    public function test_export_title_is_merged_across_dynamic_columns(): void
+    {
+        $export = new ContainerReturnExport(
+            collect(),
+            [1 => '门店A', 2 => '门店B'],
+            '2026-08-01',
+            '2026-08-03',
+        );
+        $sheet = (new Spreadsheet())->getActiveSheet();
+
+        $export->styles($sheet);
+
+        $this->assertArrayHasKey('A1:D1', $sheet->getMergeCells());
+    }
+
     /** 指定门店导出：仅所选门店成列，未选门店记录忽略；所选门店无记录整列填 0 */
     public function test_export_filters_by_selected_stores(): void
     {