<?php
namespace console\controllers;
use yii\console\Controller;
/**
 * Test controller
 */
class TestController extends Controller {
  public function actionIndex() {
    echo "cron service runnning";
  }
  public function actionMail($to) {
    echo "Sending mail to " . $to;
  }
}

use yii\console\Controller;

yii test
D:\xampp\htdocs\yii2>d:\xampp\php\php yii test cron service runnning D:\xampp\htdocs\yii2>

D:\xampp\htdocs\yii2>d:\xampp\php\php yii test/mail [--to="hemctest@gmail.com"]
Sending mail to [--to=hemctest@gmail.com]