<?php namespace SilverStripe\Forms\Tests; use SilverStripe\Dev\SapphireTest; use SilverStripe\Forms\CheckboxField_Readonly; class CheckboxFieldReadonlyTest extends SapphireTest { public function testPerformReadonlyTransformation() { $field = new CheckboxField_Readonly('Test'); $result = $field->performReadonlyTransformation(); $this->assertInstanceOf(CheckboxField_Readonly::class, $result); $this->assertNotSame($result, $field); } }