Drupal Unit Test sample snipet

FeaturesTest.php

<?php
namespace Drupal\Tests\my_module\Unit;

use Drupal\Tests\UnitTestCase;

/**
 * Tests my module related features.
 *
 * @group mygroup
 */
class MyModuleFeatureTest extends UnitTestCase {

  private $configFactory;
  private $config;

  public function testFirstFeature() {
    $this->markTestSkipped('First Feature must be tested.');
  }
}