test: 套餐列表导出表单透传筛选口径护栏

tests/Feature/AdminPlanIndexKeepFiltersOnLinksTest.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Plan;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlanIndexKeepFiltersOnLinksTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_plans_index_tools_export_form_keeps_filters(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        Plan::query()->create([
+            'code' => 'plan_keep_filters_01',
+            'name' => '筛选透传测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 9.9,
+            'list_price' => 9.9,
+            'status' => 'active',
+            'sort' => 1,
+            'published_at' => now(),
+        ]);
+
+        $res = $this->get('/admin/plans?status=active&billing_cycle=monthly&published=published&keyword=' . urlencode('筛选'));
+        $res->assertOk();
+
+        // 导出表单 hidden input 透传筛选口径
+        $res->assertSee('<form method="get" action="/admin/plans/export">', false);
+        $res->assertSee('<input type="hidden" name="status" value="active">', false);
+        $res->assertSee('<input type="hidden" name="published" value="published">', false);
+        $res->assertSee('<input type="hidden" name="billing_cycle" value="monthly">', false);
+
+        // keyword 可能包含 URL 编码字符，这里只校验 name 存在，避免脆弱断言
+        $res->assertSee('name="keyword"', false);
+    }
+}