silverstripe-textextraction/tests/FileTextCacheDatabaseTest.php

<?php

use SilverStripe\TextExtraction\Extension\FileTextCache,
    SilverStripe\TextExtraction\Extension\FileTextCache_Database,
    SilverStripe\Dev\SapphireTest,
    SilverStripe\Core\Config\Config;

class FileTextCacheDatabaseTest extends SapphireTest
{
    public function testTruncatesByMaxLength()
    {
        Config::nest();

        Config::inst()->update('FileTextCache_Database', 'max_content_length', 5);
        $cache = new FileTextCache_Database();
        $file = $this->getMock('File', array('write'));
        $content = '0123456789';
        $cache->save($file, $content);
        $this->assertEquals($cache->load($file), '01234');

        Config::unnest();
    }
}