silverstripe-framework/tests/php/Forms/AssetFieldTest/TestObject.php

<?php

namespace SilverStripe\Forms\Tests\AssetFieldTest;

use SilverStripe\Dev\TestOnly;
use SilverStripe\ORM\DataObject;

class TestObject extends DataObject implements TestOnly
{
    private static $table_name = 'AssetFieldTest_TestObject';

    private static $db = array(
        "Title" => "Text",
        "File" => "DBFile",
        "Image" => "DBFile('image/supported')"
    );
}