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<?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\Runner;

use function array_diff;
use function array_values;
use function basename;
use function get_declared_classes;
use function realpath;
use function str_ends_with;
use function strpos;
use function strtolower;
use function substr;
use PHPUnit\Framework\TestCase;
use ReflectionClass;

/**
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
 *
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
final class TestSuiteLoader
{
    /**
     * @psalm-var list<class-string>
     */
    private static array $declaredClasses = [];

/**
     * @psalm-var array<non-empty-string, list<class-string>>
     */
    private static array $fileToClassesMap = [];

/**
     * @throws Exception
     */
    public function load(string $suiteClassFile): ReflectionClass
    {
        $suiteClassFile = realpath($suiteClassFile);
        $suiteClassName = $this->classNameFromFileName($suiteClassFile);
        $loadedClasses  = $this->loadSuiteClassFile($suiteClassFile);

foreach ($loadedClasses as $className) {
            /** @noinspection PhpUnhandledExceptionInspection */
            $class = new ReflectionClass($className);

if ($class->isAnonymous()) {
                continue;
            }

if ($class->getFileName() !== $suiteClassFile) {
                continue;
            }

if (!$class->isSubclassOf(TestCase::class)) {
                continue;
            }

if (!str_ends_with(strtolower($class->getShortName()), strtolower($suiteClassName))) {
                continue;
            }

if (!$class->isAbstract()) {
                return $class;
            }

$e = new ClassIsAbstractException($class->getName(), $suiteClassFile);
        }

if (isset($e)) {
            throw $e;
        }

foreach ($loadedClasses as $className) {
            if (str_ends_with(strtolower($className), strtolower($suiteClassName))) {
                throw new ClassDoesNotExtendTestCaseException($className, $suiteClassFile);
            }
        }

throw new ClassCannotBeFoundException($suiteClassName, $suiteClassFile);
    }

private function classNameFromFileName(string $suiteClassFile): string
    {
        $className = basename($suiteClassFile, '.php');
        $dotPos    = strpos($className, '.');

if ($dotPos !== false) {
            $className = substr($className, 0, $dotPos);
        }

return $className;
    }

/**
     * @psalm-return list<class-string>
     */
    private function loadSuiteClassFile(string $suiteClassFile): array
    {
        if (isset(self::$fileToClassesMap[$suiteClassFile])) {
            return self::$fileToClassesMap[$suiteClassFile];
        }

if (empty(self::$declaredClasses)) {
            self::$declaredClasses = get_declared_classes();
        }

require_once $suiteClassFile;

$loadedClasses = array_values(
            array_diff(
                get_declared_classes(),
                self::$declaredClasses,
            ),
        );

foreach ($loadedClasses as $loadedClass) {
            /** @noinspection PhpUnhandledExceptionInspection */
            $class = new ReflectionClass($loadedClass);

if (!isset(self::$fileToClassesMap[$class->getFileName()])) {
                self::$fileToClassesMap[$class->getFileName()] = [];
            }

self::$fileToClassesMap[$class->getFileName()][] = $class->getName();
        }

self::$declaredClasses = get_declared_classes();

if (empty($loadedClasses)) {
            return self::$declaredClasses;
        }

return $loadedClasses;
    }
}

✏️ Editing: TestSuiteLoader.php

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