在phpunit测试中渲染树枝模板的问题

如何解决在phpunit测试中渲染树枝模板的问题

我目前正在开发一个首次使用“树枝”的项目，因此如果不清楚，我深表歉意。

我已经开发了一个自定义功能，可以在树枝模板上嵌入SVG图标，但是对于此特定项目，我在覆盖率和单元测试方面的得分最高。因此，我试图使用phpunit来测试我的函数是否按预期工作。

为此，我相信我必须在测试文件上呈现自定义函数的实例，然后将其与目录中的原始SVG文件进行比较。但是我在使用render方法时遇到了麻烦。我相信是因为测试中没有可用的树枝环境。

我在这里寻找类似的东西，并且找到了先前的问题：“ https://stackoverflow.com/questions/17026405/twig-template-unit-testing?rq=1”。 这个问题的答案建议使用以下内容：

$twig = self::$kernel->getContainer()->get('twig');
    $html = $twig->render('AppBundle::app/something.html.twig',['content' => 'I am some variable value']);
    self::assertEquals($html,$response->getContent());

但是当我运行时，出现以下错误：

Error: Access to undeclared static property: App\Tests\Templates\Icons\IconsExtensionTest::$kernel

我如何访问内核？

这是我当前无法正常工作的测试文件：

<?php

// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation,either version 3 of the License,or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social.  If not,see <http://www.gnu.org/licenses/>.

/**
 * This file test the Macro that Embeds SVG icons.
 *
 * @package   Tests
 *
 * @author    Ângelo D. Moura <[e-mail]>
 * @copyright 2019 Free Software Foundation,Inc http://www.fsf.org
 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
 */

namespace App\Tests\Templates\Icons;

use App\Twig\IconsExtension;
use App\Kernel;
use DirectoryIterator;
use PHPUnit\Framework\TestCase;

class IconsExtensionTest extends TestCase
{
    public function testIconsExtension()
    {

        //Get all Icon files names from "public/assets/icons"
        $icon_file_names = [];
        foreach (new DirectoryIterator('public/assets/icons/') as $file) {
            if ($file->isDot()) {
                continue;
            }
            $icon_file_names[] = $file->getFilename();
        }

        //Check if every icon file as a ".svg.twig" extension
        foreach ($icon_file_names as $icon_file_name) {
            static::assertRegExp('#([a-zA-Z0-9\s_\\.\-\(\):])+(.svg.twig)$#',$icon_file_name);
        }



        //Check if the function gives a valid HTML with a class attribute equal to the one passed
        $twig = self::$kernel->getContainer()->get('twig');

        /*
        $icon_template_render = $twig->render('public/icons/logo.svg',['iconClass' => 'icon icon-logo']);

        $iconsExtension= new IconsExtension();

        $iconsExtension_render = $iconsExtension->embedSvgIcon($twig,'logo','logo');

        self::assertEquals($icon_template_render,$iconsExtension_render);

        // Next I need to verify that the $iconsExtension_render is a valid html code (maybe through regex)

        */
    }
}

这是我的自定义函数（如果需要）：

<?php

// {{{ License
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation,see <http://www.gnu.org/licenses/>.
// }}}

/**
 * GNU social Twig extensions
 *
 * @package   GNUsocial
 * @category  Twig
 *
 * @author    Ângelo D. Moura <[e-mail]>
 * @copyright 2020 Free Software Foundation,Inc http://www.fsf.org
 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
 */

namespace App\Twig;

use Twig\Environment;
use Twig\Error\LoaderError;
use Twig\Error\RuntimeError;
use Twig\Error\SyntaxError;
use Twig\Extension\AbstractExtension;
use Twig\TwigFunction;

class IconsExtension extends AbstractExtension
{
    public function getFunctions()
    {
        return [
            new TwigFunction('icon',[$this,'embedSvgIcon'],['needs_environment' => true]
            ),];
    }

    /**
     * Renders the Svg Icon template and returns it.
     *
     * @param Environment $twig
     * @param string      $icon_name
     * @param string      $icon_css_class
     *
     * @return string
     *
     * @author Ângelo D. Moura <[e-mail]>
     */
    public function embedSvgIcon(Environment $twig,string $icon_name = '',string $icon_css_class = '')
    {
        try {
            return $twig->render('@public_path/assets/icons/' . $icon_name . '.svg.twig',['iconClass' => $icon_css_class]);
        } catch (LoaderError $e) {
            //return an empty string (a missing icon is not that important of an error)
            return '';
        } catch (RuntimeError $e) {
            //return an empty string (a missing icon is not that important of an error)
            return '';
        } catch (SyntaxError $e) {
            //return an empty string (a missing icon is not that important of an error)
            return '';
        }
    }
}

解决方法

TestCase（测试扩展的phpunit类）不足。您可能会错过symfony提供的名为KernelTestCase的扩展，该扩展提供了一个内核，您可以从中获取枝条环境（或WebTestCase，它还提供了可用于浏览网站的客户端）。>

所以不是

use PHPUnit\Framework\TestCase;

class IconsExtensionTest extends TestCase

你可以做

use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;

class IconsExtensionTest extends KernelTestCase

您可能需要在setUp方法或测试本身中调用static::bootKernel();来初始化内核和容器。

然后一切都会按预期进行