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[EDIT] FILE: AllSniffs.php

<?php
/**
 * A test class for testing all sniffs for installed standards.
 *
 * @author    Greg Sherwood <gsherwood@squiz.net>
 * @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
 * @license   https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/HEAD/licence.txt BSD Licence
 */

namespace PHP_CodeSniffer\Tests\Standards;

use PHP_CodeSniffer\Autoload;
use PHP_CodeSniffer\Util\Standards;
use PHPUnit\Framework\TestSuite;
use PHPUnit\TextUI\TestRunner;
use RecursiveDirectoryIterator;
use RecursiveIteratorIterator;

class AllSniffs
{

/**
     * Prepare the test runner.
     *
     * @return void
     */
    public static function main()
    {
        TestRunner::run(self::suite());

}//end main()

/**
     * Add all sniff unit tests into a test suite.
     *
     * Sniff unit tests are found by recursing through the 'Tests' directory
     * of each installed coding standard.
     *
     * @return \PHPUnit\Framework\TestSuite
     */
    public static function suite()
    {
        $GLOBALS['PHP_CODESNIFFER_SNIFF_CODES']      = [];
        $GLOBALS['PHP_CODESNIFFER_FIXABLE_CODES']    = [];
        $GLOBALS['PHP_CODESNIFFER_SNIFF_CASE_FILES'] = [];

$suite = new TestSuite('PHP CodeSniffer Standards');

// Optionally allow for ignoring the tests for one or more standards.
        $ignoreTestsForStandards = getenv('PHPCS_IGNORE_TESTS');
        if ($ignoreTestsForStandards === false) {
            $ignoreTestsForStandards = [];
        } else {
            $ignoreTestsForStandards = explode(',', $ignoreTestsForStandards);
        }

$installedStandards = self::getInstalledStandardDetails();

foreach ($installedStandards as $standard => $details) {
            Autoload::addSearchPath($details['path'], $details['namespace']);

if (in_array($standard, $ignoreTestsForStandards, true) === true) {
                continue;
            }

$testsDir = $details['path'].DIRECTORY_SEPARATOR.'Tests'.DIRECTORY_SEPARATOR;
            if (is_dir($testsDir) === false) {
                // No tests for this standard.
                continue;
            }

$di = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($testsDir));

foreach ($di as $file) {
                // Skip hidden files.
                if (substr($file->getFilename(), 0, 1) === '.') {
                    continue;
                }

// Tests must have the extension 'php'.
                $parts = explode('.', $file);
                $ext   = array_pop($parts);
                if ($ext !== 'php') {
                    continue;
                }

$className = Autoload::loadFile($file->getPathname());
                $GLOBALS['PHP_CODESNIFFER_STANDARD_DIRS'][$className] = $details['path'];
                $GLOBALS['PHP_CODESNIFFER_TEST_DIRS'][$className]     = $testsDir;
                $suite->addTestSuite($className);
            }
        }//end foreach

return $suite;

}//end suite()

/**
     * Get the details of all coding standards installed.
     *
     * @return array
     * @see    Standards::getInstalledStandardDetails()
     */
    protected static function getInstalledStandardDetails()
    {
        return Standards::getInstalledStandardDetails(true);

}//end getInstalledStandardDetails()

}//end class

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