$updater = new LegacyUpdater([], [], $this->conf, true, $_SESSION);
$this->assertTrue($updater->updateMethodWebThumbnailer());
$this->assertFalse($this->conf->exists('thumbnail'));
$updater = new LegacyUpdater([], [], $this->conf, true, $_SESSION);
$this->assertTrue($updater->updateMethodWebThumbnailer());
$this->assertFalse($this->conf->exists('thumbnail'));