public function appendIgnoresMessagesAboveTheSeverityThreshold()
{
$logFileUrl = vfsStream::url('testDirectory') . '/test.log';
$backend = new FileBackend(['logFileUrl' => $logFileUrl]);
$backend->setSeverityThreshold(LOG_EMERG);
$backend->open();
$backend->append('foo', LOG_INFO);
$this->assertSame(0, vfsStreamWrapper::getRoot()->getChild('test.log')->size());
}