Как Mock PHPUnit связанные модели в Laravel?

class Test1 extends Model
{
public function type_status()
{
     return $this->belongsTo('App\Types', 'type_id');
}
}

class Types extends Model
{
}

public function testGetTable()
    {
        $test1= $this->createMock(Test1::class);
        $test1->type_id = 1;

        $types = $this->createMock(Types::class);
        $types->id = 1;
        $types->type = 'Type1';
        $types->reduction = 'T1';

        $test1->attach($types);
     }