Pop\Log\Logger::alert PHP Method

    public function alert($message, array $options = array())
    {
        return $this->log(self::ALERT, $message, $options);
    }

 public function testAlert()
 {
     $l = new Logger(new File(__DIR__ . '/../tmp/app.log'));
     $l->alert('Test log message');
     $this->assertTrue(file_exists(__DIR__ . '/../tmp/app.log'));
     $this->assertGreaterThan(0, filesize(__DIR__ . '/../tmp/app.log'));
     unlink(__DIR__ . '/../tmp/app.log');
 }