fix(billing): 分次退款累计达到全额应推进为已退款

tests/Feature/AdminPlatformOrderRefundReceiptAccumulateToFullyRefundedTest.php

@@ -0,0 +1,88 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Plan;
+use App\Models\PlatformOrder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlatformOrderRefundReceiptAccumulateToFullyRefundedTest 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_refund_receipts_can_accumulate_and_push_status_to_refunded(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'refund_acc_test',
+            'name' => '退款累计到全额测试',
+            'billing_cycle' => 'monthly',
+            'price' => 30,
+            'list_price' => 30,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $order = PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_REFUND_ACC_0001',
+            'order_type' => 'new_purchase',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 30,
+            'paid_amount' => 30,
+            'placed_at' => now(),
+            'paid_at' => now(),
+            'activated_at' => now(),
+        ]);
+
+        // 第一次退款 10 -> 部分退款
+        $this->post('/admin/platform-orders/' . $order->id . '/add-refund-receipt', [
+            'type' => 'refund',
+            'channel' => 'wechat',
+            'amount' => 10,
+            'refunded_at' => now()->format('Y-m-d H:i:s'),
+            'note' => '第一次退款',
+        ])->assertRedirect();
+
+        $order->refresh();
+        $this->assertSame('partially_refunded', $order->payment_status);
+
+        // 第二次退款 20 -> 累计 30，应推进到 refunded
+        $this->post('/admin/platform-orders/' . $order->id . '/add-refund-receipt', [
+            'type' => 'refund',
+            'channel' => 'wechat',
+            'amount' => 20,
+            'refunded_at' => now()->addMinute()->format('Y-m-d H:i:s'),
+            'note' => '第二次退款',
+        ])->assertRedirect();
+
+        $order->refresh();
+
+        $this->assertSame('refunded', $order->payment_status);
+        $this->assertNotNull($order->refunded_at);
+
+        $refundSummaryTotal = (float) data_get($order->meta, 'refund_summary.total_amount');
+        $this->assertSame(30.0, $refundSummaryTotal);
+    }
+}