silverstripe-framework/tests/php/ORM/DataDifferencerTest/TestObject.php

<?php

namespace SilverStripe\ORM\Tests\DataDifferencerTest;

use SilverStripe\Assets\Image;
use SilverStripe\Dev\TestOnly;
use SilverStripe\Forms\ListboxField;
use SilverStripe\ORM\DataObject;
use SilverStripe\ORM\Versioning\Versioned;

/**
 * @property string $Choices
 * @method Image Image()
 * @method HasOneRelationObject HasOneRelation()
 */
class TestObject extends DataObject implements TestOnly
{
    private static $table_name = 'DataDifferencerTest_Object';

    private static $extensions = array(
        Versioned::class
    );

    private static $db = array(
        'Choices' => "Varchar",
    );

    private static $has_one = array(
        'Image' => Image::class,
        'HasOneRelation' => HasOneRelationObject::class
    );

    public function getCMSFields()
    {
        $fields = parent::getCMSFields();
        $choices = array(
            'a' => 'a',
            'b' => 'b',
            'c' => 'c',
        );
        $listField = new ListboxField('Choices', 'Choices', $choices);
        $fields->push($listField);

        return $fields;
    }
}