SlotsHelper example

public function testExtendRender()
    {
        $engine = new ProjectTemplateEngine(new TemplateNameParser(), $this->loader, []);
        try {
            $engine->render('name');
            $this->fail('->render() throws an InvalidArgumentException if the template does not exist');
        } catch (\Exception $e) {
            $this->assertInstanceOf(\InvalidArgumentException::class, $e, '->render() throws an InvalidArgumentException if the template does not exist');
            $this->assertEquals('The template "name" does not exist.', $e->getMessage(), '->render() throws an InvalidArgumentException if the template does not exist');
        }

        $engine = new ProjectTemplateEngine(new TemplateNameParser(), $this->loader, [new SlotsHelper()]);
        $engine->set(new \Symfony\Component\Templating\Tests\Fixtures\SimpleHelper('bar'));
        $this->loader->setTemplate('foo.php', '<?php $this->extend("layout.php"); echo $this[\'foo\'].$foo ?>');
        $this->loader->setTemplate('layout.php', '-<?php echo $this[\'slots\']->get("_content") ?>-');
        $this->assertEquals('-barfoo-', $engine->render('foo.php', ['foo' => 'foo']), '->render() uses the decorator to decorate the template');

        $engine = new ProjectTemplateEngine(new TemplateNameParser(), $this->loader, [new SlotsHelper()]);
        $engine->set(new \Symfony\Component\Templating\Tests\Fixtures\SimpleHelper('bar'));
        $this->loader->setTemplate('bar.php', 'bar');
        $this->loader->setTemplate('foo.php', '<?php $this->extend("layout.php"); echo $foo ?>');
        $this->loader->setTemplate('layout.php', '<?php echo $this->render("bar.php") ?>-<?php echo $this[\'slots\']->get("_content") ?>-');
        $this->assertEquals('bar-foo-', $engine->render('foo.php', ['foo' => 'foo', 'bar' => 'bar']), '->render() supports render() calls in templates');
    }

use PHPUnit\Framework\TestCase;
use Symfony\Component\Templating\Helper\SlotsHelper;

/** * @group legacy */
class SlotsHelperTest extends TestCase
{
    public function testHasGetSet()
    {
        $helper = new SlotsHelper();
        $helper->set('foo', 'bar');
        $this->assertEquals('bar', $helper->get('foo'), '->set() sets a slot value');
        $this->assertEquals('bar', $helper->get('bar', 'bar'), '->get() takes a default value to return if the slot does not exist');

        $this->assertTrue($helper->has('foo'), '->has() returns true if the slot exists');
        $this->assertFalse($helper->has('bar'), '->has() returns false if the slot does not exist');
    }

    public function testOutput()
    {
        $helper = new SlotsHelper();