feat(billing): 平台订单创建页展示订阅关联提示并加测试

tests/Feature/AdminPlatformOrderCreateTest.php

@@ -47,6 +47,46 @@ class AdminPlatformOrderCreateTest extends TestCase
         $res->assertSee('创建订单');
     }
 
+    public function test_platform_admin_can_open_create_platform_order_form_with_site_subscription_hint(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+
+        $plan = Plan::query()->create([
+            'code' => 'create_order_plan_01b',
+            'name' => '创建订单测试套餐(订阅联动)',
+            'billing_cycle' => 'monthly',
+            'price' => 100,
+            'list_price' => 100,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $sub = \App\Models\SiteSubscription::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'status' => 'activated',
+            'source' => 'manual',
+            'subscription_no' => 'SUB_CREATE_ORDER_HINT_0001',
+            'plan_name' => $plan->name,
+            'billing_cycle' => 'monthly',
+            'period_months' => 1,
+            'amount' => 88,
+            'starts_at' => now()->subDays(2),
+            'ends_at' => now()->addDays(20),
+            'activated_at' => now()->subDays(2),
+        ]);
+
+        $res = $this->get('/admin/platform-orders/create?site_subscription_id=' . $sub->id);
+
+        $res->assertOk();
+        $res->assertSee('本订单将关联订阅：');
+        $res->assertSee('SUB_CREATE_ORDER_HINT_0001');
+        $res->assertSee('/admin/site-subscriptions/' . $sub->id);
+    }
+
     public function test_platform_admin_can_create_platform_order_and_see_it_in_show_page(): void
     {
         $this->loginAsPlatformAdmin();