ContrivedController.php

<?php

namespace Drupal\testing_example\Controller;

use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\StringTranslation\TranslationInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * A highly-contrived controller class used to demonstrate unit testing.
 */
class ContrivedController implements ContainerInjectionInterface {
    use StringTranslationTrait;
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('string_translation'));
    }
    
    /**
     * Construct a new controller.
     *
     * @param Drupal\Core\StringTranslation\TranslationInterface $translation
     *   The translation service.
     */
    public function __construct(TranslationInterface $translation) {
        $this->setStringTranslation($translation);
    }
    
    /**
     * A controller method which displays a sum in terms of hands.
     *
     * @param int $first
     *   A parameter to the controller path.
     * @param int $second
     *   A parameter to the controller path.
     *
     * @return string[]
     *   A markup array.
     */
    public function displayAddedNumbers($first, $second) {
        return [
            '#markup' => '<p>' . $this->handCount($first, $second) . '</p>',
        ];
    }
    
    /**
     * Generate a message based on how many hands are needed to count the sum.
     *
     * @param int $first
     *   First parameter.
     * @param int $second
     *   Second parameter.
     *
     * @return \Drupal\Core\StringTranslation\TranslatableMarkup
     *   The translated message.
     */
    protected function handCount($first, $second) {
        $sum = abs($this->add((int) $first, (int) $second));
        if ($sum <= 5) {
            $message = $this->t('I can count these on one hand.');
        }
        elseif ($sum <= 10) {
            $message = $this->t('I need two hands to count these.');
        }
        else {
            $message = $this->t("That's just too many numbers to count.");
        }
        return $message;
    }
    
    /**
     * Add two numbers.
     *
     * @param int $first
     *   The first parameter.
     * @param int $second
     *   The second parameter.
     *
     * @return int
     *   The sum of the two parameters.
     */
    protected function add($first, $second) {
        return $first + $second;
    }

}