没有连接到数据库的Laravel模型工厂

我想在一些PHPUnit测试中使用Laravel的模型工厂。我唯一想做的就是创建一个Model实例，而不将其保存到数据库中。

为什么模型工厂需要连接到数据库?这些测试必须在没有配置数据库的CI环境中通过。

当我通过new App'Model($dataArray)手动创建模型时，测试通过并且不需要连接。

我在其他地方使用模型工厂，所以我想在测试中重用它，以避免代码重复。

我正在使用MongoDB和jenssegers/laravel-mongodb库，但我猜它没有关系-在纯雄辩和例如MySQL数据库中，问题是相同的。

没有数据库的测试:

class ModelTransformerTest extends TestCase
{
    public function testTransformMinimalModelData()
    {
        $data = [
            '_id' => $faker->md5,
            'email' => $faker->email,
        ];
        $model = new App'Model($data);
        // […];
    }
}

My Model Factory

$factory->defineAs(Model::class, 'base', function ($faker) {
    return [
        '_id' => $faker->md5,
        'email' => $faker->email,
    ];
});

测试需要数据库连接:

class ModelTransformerTest extends TestCase
{
    public function testTransformMinimalModelData()
    {
        $model = factory(App'Model::class, 'base')->make();
        // […];
    }
}

全栈跟踪:

Error: Class 'MongoDB'Driver'Manager' not found
app'vendor'mongodb'mongodb'src'Client.php:56
app'vendor'jenssegers'mongodb'src'Jenssegers'Mongodb'Connection.php:147
app'vendor'jenssegers'mongodb'src'Jenssegers'Mongodb'Connection.php:37
app'vendor'jenssegers'mongodb'src'Jenssegers'Mongodb'MongodbServiceProvider.php:27
app'vendor'illuminate'database'DatabaseManager.php:173
app'vendor'illuminate'database'DatabaseManager.php:68
app'vendor'illuminate'database'Eloquent'Model.php:3282
app'vendor'illuminate'database'Eloquent'Model.php:3248
app'vendor'jenssegers'mongodb'src'Jenssegers'Mongodb'Eloquent'Model.php:523
app'vendor'jenssegers'mongodb'src'Jenssegers'Mongodb'Eloquent'Model.php:284
app'vendor'illuminate'database'Eloquent'Model.php:443
app'vendor'illuminate'database'Eloquent'Model.php:281
app'vendor'illuminate'database'Eloquent'FactoryBuilder.php:142
app'vendor'illuminate'database'Eloquent'Model.php:2286
app'vendor'illuminate'database'Eloquent'FactoryBuilder.php:143
app'vendor'illuminate'database'Eloquent'FactoryBuilder.php:106
app'tests'phpunit'Transformers'ModelTransformerTest.php:25
'php'pear'PHPUnit'TextUI'Command.php:176
'php'pear'PHPUnit'TextUI'Command.php:129

use Illuminate'Foundation'Testing'DatabaseTransactions;
class ModelTransformerTest extends TestCase
{
    use DatabaseTransactions;
}