平台订单列表：快捷筛选链接保留上下文并清空 page

tests/Feature/AdminPlatformOrderIndexQuickFilterLinksKeepContextTest.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlatformOrderIndexQuickFilterLinksKeepContextTest 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_quick_filter_links_should_keep_context_and_clear_page(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        // 模拟：当前已筛选站点/套餐/订阅ID，并且带 page/back
+        $res = $this->get('/admin/platform-orders?merchant_id=2&plan_id=3&site_subscription_id=4&page=9&back=%2Fadmin%2Fplans');
+        $res->assertOk();
+
+        // 以“待支付”为例：应保留 merchant_id/plan_id/site_subscription_id/back，同时覆盖 payment_status=unpaid，并清除 page
+        $res->assertSee('/admin/platform-orders?merchant_id=2&plan_id=3&site_subscription_id=4&back=%2Fadmin%2Fplans&payment_status=unpaid', false);
+        $res->assertDontSee('page=9', false);
+
+        // “全部”应清空筛选，仅保留 back
+        $res->assertSee('/admin/platform-orders?back=%2Fadmin%2Fplans', false);
+    }
+}