PhtmlTemplateTest.php

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<?php
namespace Magento\Test\Legacy;

class PhtmlTemplateTest extends \PHPUnit\Framework\TestCase
{
    public function testBlockVariableInsteadOfThis()
    {
        $invoker = new \Magento\Framework\App\Utility\AggregateInvoker($this);
        $invoker(
            function ($file) {
                $this->assertNotRegExp(
                    '/this->(?!helper)\S*/iS',
                    file_get_contents($file),
                    'Access to members and methods of Block class through $this is ' .
                    'obsolete in phtml templates. Use only $block instead of $this.'
                );
            },
            \Magento\Framework\App\Utility\Files::init()->getPhtmlFiles()
        );
    }

    public function testObsoleteBlockMethods()
    {
        $invoker = new \Magento\Framework\App\Utility\AggregateInvoker($this);
        $invoker(
            function ($file) {
                $this->assertNotRegexp(
                    '/block->_[^_]+\S*\(/iS',
                    file_get_contents($file),
                    'Access to protected and private members of Block class is ' .
                    'obsolete in phtml templates. Use only public members.'
                );
            },
            \Magento\Framework\App\Utility\Files::init()->getPhtmlFiles()
        );
    }

    public function testObsoleteJavascriptAttributeType()
    {
        $invoker = new \Magento\Framework\App\Utility\AggregateInvoker($this);
        $invoker(
            function ($file) {
                $this->assertNotRegexp(
                    '/type="text\/javascript"/',
                    file_get_contents($file),
                    'Please do not use "text/javascript" type attribute.'
                );
            },
            \Magento\Framework\App\Utility\Files::init()->getPhtmlFiles()
        );
    }
}