Laravel：单位测试可能无法使用数据库

Question

这是我要编写单元测试的代码：

$towpRepo = \App::make(TransportOrderWithoutPriceRepository::class);
$towp = $towpRepo->findByOrderNumber($orderNumber);
if ($towp) {
   $towp->delete();
}

以下是FindbyOrderNumber方法：

public function findByOrderNumber($orderNumber)
{
     return TransportOrderWithoutPrice::where('order_number', '=', $orderNumber)->first();
}

现在是测试代码：

$transportOrderWithoutPrice = mockery::mock('Phirater\Domain\TransportOrdersWithoutPrice\TransportOrderWithoutPrice');
$transportOrderWithoutPriceRepo = mockery::mock('Phirater\Domain\TransportOrdersWithoutPrice\TransportOrderWithoutPriceRepository');
$transportOrderWithoutPriceRepo->shouldReceive('findByOrderNumber')->once()->andReturn($transportOrderWithoutPrice);

现在每当我运行测试时，它返回以下错误：

phiratertest \ unit \ phirater \ domain \ transportorders \ createTransPortorder fromPriCeresponSecomMandHandlertest :: TestCreatEtransportorder 照明\ database \ queryException：sqlstate [hy000] [1049]未知数据库'您在做什么？单位测试可能不会使用数据库！ （SQL：SELECT *来自Transport_orders_without_price其中order_number = 1限制1）

/home/vagrant/code/phirater-l51/vendor/laravel/framework/src/Illuminate/Database/Connection.php:664
/home/vagrant/code/phirater-l51/vendor/laravel/framework/src/Illuminate/Database/Connection.php:624
/home/vagrant/code/phirater-l51/vendor/laravel/framework/src/Illuminate/Database/Connection.php:333
/home/vagrant/code/phirater-l51/vendor/laravel/framework/src/Illuminate/Database/Query/Builder.php:1719
/home/vagrant/code/phirater-l51/vendor/laravel/framework/src/Illuminate/Database/Query/Builder.php:1704
/home/vagrant/code/phirater-l51/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php:481
/home/vagrant/code/phirater-l51/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php:465
/home/vagrant/code/phirater-l51/vendor/laravel/framework/src/Illuminate/Database/Concerns/BuildsQueries.php:77
/home/vagrant/code/phirater-l51/app/Domain/TransportOrdersWithoutPrice/TransportOrderWithoutPriceRepository.php:167
/home/vagrant/code/phirater-l51/app/Domain/Configuration/Events/Listeners/CleanupTrait.php:59
/home/vagrant/code/phirater-l51/app/Domain/Configuration/Events/Listeners/TransportOrderSubscriber.php:84
/home/vagrant/code/phirater-l51/vendor/laravel/framework/src/Illuminate/Events/Dispatcher.php:369
/home/vagrant/code/phirater-l51/vendor/laravel/framework/src/Illuminate/Events/Dispatcher.php:200
/home/vagrant/code/phirater-l51/vendor/laravel/framework/src/Illuminate/Foundation/helpers.php:467
/home/vagrant/code/phirater-l51/app/Domain/TransportOrders/CreateTransportOrderFromPriceResponseCommandHandler.php:117
/home/vagrant/code/phirater-l51/tests/unit/Phirater/TransportOrders/CreateTransportOrderFromPriceResponseCommandHandlerTest.php:90

我在这里做错了什么？我在laravel 5.5和phpunit 6.5.14上。