first version

app/Providers/AppServiceProvider.php

@@ -2,6 +2,7 @@
 
 namespace App\Providers;
 
+use App\Services\WechatService;
 use Barryvdh\DomPDF\Facade\Pdf;
 use Illuminate\Foundation\Exceptions\Handler as ExceptionsHandler;
 use Illuminate\Support\ServiceProvider;
@@ -17,6 +18,9 @@ class AppServiceProvider extends ServiceProvider
     {
 
         $this->app->bind(ExceptionsHandler::class, \App\Exceptions\ExceptionsHandler::class);
+
+        // 单例：测试通过 setHttpClient() 注入 Mock 后，控制器解析到同一实例
+        $this->app->singleton(WechatService::class);
     }
 
     /**