IOC Container Bindings are not available in Unit Test

[arsalan-onschedule]

Hi,
I have bound an Interface in IOC Container using Service provider, I found it working while resolving it using tinker but when I use it in unit test it doesn't find any binding. Could someone help me to resolve this issue.
Thanks in advance.

Code in service provider.

    // Private chat
        $this->app->bind(IPrivateChat::class, function ($app){
            return $this->app->makeWith(IChatService::class, ['sid'=> $this->twilioPrivatechatServiceId]);
        });

Code in service class

    public function __construct()
    {
        $this->chatServiceClient = resolve(IPrivateChat::class);
    }

Code in unit test class

        $channel = (new CreateTwilioChannelService())->execute($data);

When i dd(app()->getBindings()) in tinker i get all of my bindings along with core framework, but when i dd(app()->getBindings()) i get an empty list.

[stratoghost]

Are you extending the right TestCase? It should be Tests\TestCase