PHP-CS-Fixer/tests/AutoReview/ProjectCodeTest.php

<?php

declare(strict_types=1);

/*
 * This file is part of PHP CS Fixer.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *     Dariusz Rumiński <dariusz.ruminski@gmail.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace PhpCsFixer\Tests\AutoReview;

use PhpCsFixer\AbstractFixer;
use PhpCsFixer\AbstractPhpdocTypesFixer;
use PhpCsFixer\AbstractProxyFixer;
use PhpCsFixer\Console\Command\FixCommand;
use PhpCsFixer\DocBlock\Annotation;
use PhpCsFixer\DocBlock\DocBlock;
use PhpCsFixer\Fixer\AbstractPhpUnitFixer;
use PhpCsFixer\Fixer\PhpUnit\PhpUnitNamespacedFixer;
use PhpCsFixer\FixerFactory;
use PhpCsFixer\Preg;
use PhpCsFixer\Tests\Test\AbstractFixerTestCase;
use PhpCsFixer\Tests\Test\AbstractIntegrationTestCase;
use PhpCsFixer\Tests\TestCase;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
use PhpCsFixer\Tokenizer\TokensAnalyzer;
use Symfony\Component\Finder\Finder;
use Symfony\Component\Finder\SplFileInfo;

/**
 * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
 *
 * @internal
 *
 * @coversNothing
 *
 * @group auto-review
 * @group covers-nothing
 */
final class ProjectCodeTest extends TestCase
{
    /**
     * @var null|array<string, array{class-string<TestCase>}>
     */
    private static ?array $testClassCases = null;

    /**
     * @var null|array<string, array{class-string}>
     */
    private static ?array $srcClassCases = null;

    /**
     * @var array<class-string, Tokens>
     */
    private static array $tokensCache = [];

    public static function tearDownAfterClass(): void
    {
        self::$srcClassCases = null;
        self::$testClassCases = null;
        self::$tokensCache = [];
    }

    /**
     * @dataProvider provideThatSrcClassHaveTestClassCases
     */
    public function testThatSrcClassHaveTestClass(string $className): void
    {
        $testClassName = 'PhpCsFixer\\Tests'.substr($className, 10).'Test';

        self::assertTrue(class_exists($testClassName), sprintf('Expected test class "%s" for "%s" not found.', $testClassName, $className));
    }

    /**
     * @dataProvider provideThatSrcClassesNotAbuseInterfacesCases
     */
    public function testThatSrcClassesNotAbuseInterfaces(string $className): void
    {
        $rc = new \ReflectionClass($className);

        $allowedMethods = array_map(
            fn (\ReflectionClass $interface): array => $this->getPublicMethodNames($interface),
            $rc->getInterfaces()
        );

        if (\count($allowedMethods) > 0) {
            $allowedMethods = array_unique(array_merge(...array_values($allowedMethods)));
        }

        $allowedMethods[] = '__construct';
        $allowedMethods[] = '__destruct';
        $allowedMethods[] = '__wakeup';

        $exceptionMethods = [
            'configure', // due to AbstractFixer::configure
            'getConfigurationDefinition', // due to AbstractFixer::getConfigurationDefinition
            'getDefaultConfiguration', // due to AbstractFixer::getDefaultConfiguration
            'setWhitespacesConfig', // due to AbstractFixer::setWhitespacesConfig
        ];

        $definedMethods = $this->getPublicMethodNames($rc);

        $extraMethods = array_diff(
            $definedMethods,
            $allowedMethods,
            $exceptionMethods
        );

        sort($extraMethods);

        self::assertEmpty(
            $extraMethods,
            sprintf(
                "Class '%s' should not have public methods that are not part of implemented interfaces.\nViolations:\n%s",
                $className,
                implode("\n", array_map(static fn (string $item): string => " * {$item}", $extraMethods))
            )
        );
    }

    /**
     * @dataProvider provideSrcClassCases
     */
    public function testThatSrcClassesNotExposeProperties(string $className): void
    {
        $rc = new \ReflectionClass($className);

        self::assertEmpty(
            $rc->getProperties(\ReflectionProperty::IS_PUBLIC),
            sprintf('Class \'%s\' should not have public properties.', $className)
        );

        if ($rc->isFinal()) {
            return;
        }

        $allowedProps = [];
        $definedProps = $rc->getProperties(\ReflectionProperty::IS_PROTECTED);

        if (false !== $rc->getParentClass()) {
            $allowedProps = $rc->getParentClass()->getProperties(\ReflectionProperty::IS_PROTECTED);
        }

        $allowedProps = array_map(static fn (\ReflectionProperty $item): string => $item->getName(), $allowedProps);

        $definedProps = array_map(static fn (\ReflectionProperty $item): string => $item->getName(), $definedProps);

        $exceptionPropsPerClass = [
            AbstractFixer::class => ['configuration', 'configurationDefinition', 'whitespacesConfig'],
            AbstractPhpdocTypesFixer::class => ['tags'],
            AbstractProxyFixer::class => ['proxyFixers'],
            FixCommand::class => ['defaultDescription', 'defaultName'],
        ];

        $extraProps = array_diff(
            $definedProps,
            $allowedProps,
            $exceptionPropsPerClass[$className] ?? []
        );

        sort($extraProps);

        self::assertEmpty(
            $extraProps,
            sprintf(
                "Class '%s' should not have protected properties.\nViolations:\n%s",
                $className,
                implode("\n", array_map(static fn (string $item): string => " * {$item}", $extraProps))
            )
        );
    }

    /**
     * @dataProvider provideTestClassCases
     */
    public function testThatTestClassExtendsPhpCsFixerTestCaseClass(string $className): void
    {
        self::assertTrue(is_subclass_of($className, TestCase::class), sprintf('Expected test class "%s" to be a subclass of "%s".', $className, TestCase::class));
    }

    /**
     * @dataProvider provideTestClassCases
     */
    public function testThatTestClassesAreTraitOrAbstractOrFinal(string $testClassName): void
    {
        $rc = new \ReflectionClass($testClassName);

        self::assertTrue(
            $rc->isTrait() || $rc->isAbstract() || $rc->isFinal(),
            sprintf('Test class %s should be trait, abstract or final.', $testClassName)
        );
    }

    /**
     * @dataProvider provideTestClassCases
     */
    public function testThatTestClassesAreInternal(string $testClassName): void
    {
        $rc = new \ReflectionClass($testClassName);
        $doc = new DocBlock($rc->getDocComment());

        self::assertNotEmpty(
            $doc->getAnnotationsOfType('internal'),
            sprintf('Test class %s should have internal annotation.', $testClassName)
        );
    }

    /**
     * @dataProvider provideTestClassCases
     */
    public function testThatTestClassesPublicMethodsAreCorrectlyNamed(string $testClassName): void
    {
        $reflectionClass = new \ReflectionClass($testClassName);

        $publicMethods = array_filter(
            $reflectionClass->getMethods(\ReflectionMethod::IS_PUBLIC),
            static fn (\ReflectionMethod $reflectionMethod): bool => $reflectionMethod->getDeclaringClass()->getName() === $reflectionClass->getName()
        );

        if ([] === $publicMethods) {
            $this->expectNotToPerformAssertions(); // no methods to test, all good!

            return;
        }

        foreach ($publicMethods as $method) {
            self::assertMatchesRegularExpression(
                '/^(test|expect|provide|setUpBeforeClass$|tearDownAfterClass$|__construct$)/',
                $method->getName(),
                sprintf('Public method "%s::%s" is not properly named.', $reflectionClass->getName(), $method->getName())
            );
        }
    }

    /**
     * @dataProvider provideDataProviderMethodCases
     */
    public function testThatTestDataProvidersAreUsed(string $testClassName, \ReflectionMethod $dataProvider): void
    {
        $usedDataProviderMethodNames = [];

        foreach ($this->getUsedDataProviderMethodNames($testClassName) as $providerName) {
            $usedDataProviderMethodNames[] = $providerName;
        }

        $dataProviderName = $dataProvider->getName();

        self::assertContains(
            $dataProviderName,
            $usedDataProviderMethodNames,
            sprintf('Data provider in "%s" with name "%s" is not used.', $dataProvider->getDeclaringClass()->getName(), $dataProviderName)
        );
    }

    /**
     * @dataProvider provideDataProviderMethodCases
     */
    public function testThatTestDataProvidersAreCorrectlyNamed(string $testClassName, \ReflectionMethod $dataProvider): void
    {
        $dataProviderName = $dataProvider->getShortName();

        self::assertMatchesRegularExpression('/^provide[A-Z]\S+Cases$/', $dataProviderName, sprintf(
            'Data provider in "%s" with name "%s" is not correctly named.',
            $testClassName,
            $dataProviderName
        ));
    }

    public static function provideDataProviderMethodCases(): iterable
    {
        foreach (self::provideTestClassCases() as $testClassName) {
            $testClassName = reset($testClassName);
            $reflectionClass = new \ReflectionClass($testClassName);

            $methods = array_filter(
                $reflectionClass->getMethods(\ReflectionMethod::IS_PUBLIC),
                static fn (\ReflectionMethod $reflectionMethod): bool => $reflectionMethod->getDeclaringClass()->getName() === $reflectionClass->getName() && str_starts_with($reflectionMethod->getName(), 'provide')
            );

            foreach ($methods as $method) {
                yield $testClassName.'::'.$method->getName() => [$testClassName, $method];
            }
        }
    }

    /**
     * @dataProvider provideTestClassCases
     */
    public function testThatTestClassCoversAreCorrect(string $testClassName): void
    {
        $reflectionClass = new \ReflectionClass($testClassName);

        if ($reflectionClass->isAbstract() || $reflectionClass->isInterface()) {
            $this->expectNotToPerformAssertions();

            return;
        }

        $doc = $reflectionClass->getDocComment();
        self::assertNotFalse($doc);

        if (Preg::match('/@coversNothing/', $doc, $matches)) {
            return;
        }

        $covers = Preg::matchAll('/@covers (\S*)/', $doc, $matches);
        self::assertGreaterThanOrEqual(1, $covers, sprintf('Missing @covers in PHPDoc of test class "%s".', $testClassName));

        array_shift($matches);
        $class = '\\'.str_replace('PhpCsFixer\Tests\\', 'PhpCsFixer\\', substr($testClassName, 0, -4));
        $parentClass = (new \ReflectionClass($class))->getParentClass();
        $parentClassName = false === $parentClass ? null : '\\'.$parentClass->getName();

        foreach ($matches as $match) {
            $classMatch = array_shift($match);
            self::assertTrue(
                $classMatch === $class || $parentClassName === $classMatch,
                sprintf('Unexpected @covers "%s" for "%s".', $classMatch, $testClassName)
            );
        }
    }

    /**
     * @dataProvider provideSrcClassCases
     * @dataProvider provideTestClassCases
     */
    public function testThereIsNoUsageOfExtract(string $className): void
    {
        $calledFunctions = $this->extractFunctionNamesCalledInClass($className);

        $message = sprintf('Class %s must not use "extract()", explicitly extract only the keys that are needed - you never know what\'s else inside.', $className);
        self::assertNotContains('extract', $calledFunctions, $message);
    }

    /**
     * @dataProvider provideThereIsNoPregFunctionUsedDirectlyCases
     */
    public function testThereIsNoPregFunctionUsedDirectly(string $className): void
    {
        $calledFunctions = $this->extractFunctionNamesCalledInClass($className);

        $message = sprintf('Class %s must not use preg_*, it shall use Preg::* instead.', $className);
        self::assertNotContains('preg_filter', $calledFunctions, $message);
        self::assertNotContains('preg_grep', $calledFunctions, $message);
        self::assertNotContains('preg_match', $calledFunctions, $message);
        self::assertNotContains('preg_match_all', $calledFunctions, $message);
        self::assertNotContains('preg_replace', $calledFunctions, $message);
        self::assertNotContains('preg_replace_callback', $calledFunctions, $message);
        self::assertNotContains('preg_split', $calledFunctions, $message);
    }

    /**
     * @dataProvider provideTestClassCases
     */
    public function testNoPHPUnitMockUsed(string $className): void
    {
        $calledFunctions = $this->extractFunctionNamesCalledInClass($className);

        $message = sprintf('Class %s must not use PHPUnit\'s mock, it shall use anonymous class instead.', $className);
        self::assertNotContains('getMockBuilder', $calledFunctions, $message);
        self::assertNotContains('createMock', $calledFunctions, $message);
        self::assertNotContains('createMockForIntersectionOfInterfaces', $calledFunctions, $message);
        self::assertNotContains('createPartialMock', $calledFunctions, $message);
        self::assertNotContains('createTestProxy', $calledFunctions, $message);
        self::assertNotContains('getMockForAbstractClass', $calledFunctions, $message);
        self::assertNotContains('getMockFromWsdl', $calledFunctions, $message);
        self::assertNotContains('getMockForTrait', $calledFunctions, $message);
        self::assertNotContains('getMockClass', $calledFunctions, $message);
        self::assertNotContains('createConfiguredMock', $calledFunctions, $message);
        self::assertNotContains('getObjectForTrait', $calledFunctions, $message);
    }

    /**
     * @dataProvider provideTestClassCases
     */
    public function testExpectedInputOrder(string $testClassName): void
    {
        $reflectionClass = new \ReflectionClass($testClassName);

        $publicMethods = array_filter(
            $reflectionClass->getMethods(\ReflectionMethod::IS_PUBLIC),
            static fn (\ReflectionMethod $reflectionMethod): bool => $reflectionMethod->getDeclaringClass()->getName() === $reflectionClass->getName()
        );

        if ([] === $publicMethods) {
            $this->expectNotToPerformAssertions(); // no methods to test, all good!

            return;
        }

        /** @var \ReflectionMethod $method */
        foreach ($publicMethods as $method) {
            $parameters = $method->getParameters();

            if (\count($parameters) < 2) {
                $this->addToAssertionCount(1); // not enough parameters to test, all good!

                continue;
            }

            $expected = [
                'expected' => false,
                'input' => false,
            ];

            for ($i = \count($parameters) - 1; $i >= 0; --$i) {
                $name = $parameters[$i]->getName();

                if (isset($expected[$name])) {
                    $expected[$name] = $i;
                }
            }

            $expected = array_filter($expected, static fn ($item): bool => false !== $item);

            if (\count($expected) < 2) {
                $this->addToAssertionCount(1); // not enough parameters to test, all good!

                continue;
            }

            self::assertLessThan(
                $expected['input'],
                $expected['expected'],
                sprintf('Public method "%s::%s" has parameter \'input\' before \'expected\'.', $reflectionClass->getName(), $method->getName())
            );
        }
    }

    /**
     * @dataProvider provideDataProviderMethodCases
     */
    public function testDataProvidersAreNonPhpVersionConditional(string $testClassName, \ReflectionMethod $dataProvider): void
    {
        $dataProviderName = $dataProvider->getName();
        $methodId = $testClassName.'::'.$dataProviderName;

        $tokens = $this->createTokensForClass($testClassName);
        $tokensAnalyzer = new TokensAnalyzer($tokens);
        $dataProviderElements = array_filter($tokensAnalyzer->getClassyElements(), static function (array $v, int $k) use ($tokens, $dataProviderName) {
            $nextToken = $tokens[$tokens->getNextMeaningfulToken($k)];

            // element is data provider method
            return 'method' === $v['type'] && $nextToken->equals([T_STRING, $dataProviderName]);
        }, ARRAY_FILTER_USE_BOTH);

        if (1 !== \count($dataProviderElements)) {
            throw new \UnexpectedValueException(sprintf('DataProvider `%s` should be found exactly once, got %d times.', $methodId, \count($dataProviderElements)));
        }

        $methodIndex = array_key_first($dataProviderElements);
        $startIndex = $tokens->getNextTokenOfKind($methodIndex, ['{']);
        $endIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_CURLY_BRACE, $startIndex);

        $versionTokens = array_filter($tokens->findGivenKind(T_STRING, $startIndex, $endIndex), static function (Token $v): bool {
            return $v->equalsAny([
                [T_STRING, 'PHP_VERSION_ID'],
                [T_STRING, 'PHP_MAJOR_VERSION'],
                [T_STRING, 'PHP_MINOR_VERSION'],
                [T_STRING, 'PHP_RELEASE_VERSION'],
                [T_STRING, 'phpversion'],
            ], false);
        });

        self::assertCount(
            0,
            $versionTokens,
            sprintf(
                "DataProvider '%s' should not check PHP version and provide different cases depends on it. It leads to situation when DataProvider provides 'sometimes 10, sometimes 11' test cases, depends on PHP version. That makes John Doe to see 'you run 10/10' and thinking all tests are executed, instead of actually seeing 'you run 10/11 and 1 skipped'.",
                $methodId,
            ),
        );
    }

    /**
     * @dataProvider provideDataProviderMethodCases
     */
    public function testDataProvidersDeclaredReturnType(string $testClassName, \ReflectionMethod $method): void
    {
        $methodId = $testClassName.'::'.$method->getName();

        self::assertSame('iterable', $method->hasReturnType() && $method->getReturnType() instanceof \ReflectionNamedType ? $method->getReturnType()->getName() : null, sprintf('DataProvider `%s` must provide `iterable` as return in method prototype.', $methodId));

        $doc = new DocBlock(false !== $method->getDocComment() ? $method->getDocComment() : '/** */');

        $returnDocs = $doc->getAnnotationsOfType('return');

        if (\count($returnDocs) > 1) {
            throw new \UnexpectedValueException(sprintf('Multiple `%s@return` annotations.', $methodId));
        }

        if (1 !== \count($returnDocs)) {
            $this->addToAssertionCount(1); // no @return annotation, all good!

            return;
        }

        $returnDoc = $returnDocs[0];
        $types = $returnDoc->getTypes();

        self::assertCount(1, $types, sprintf('DataProvider `%s@return` must provide single type.', $methodId));
        self::assertMatchesRegularExpression('/^iterable\</', $types[0], sprintf('DataProvider `%s@return` must return iterable.', $methodId));
        self::assertMatchesRegularExpression('/^iterable\\<(?:(?:int\\|)?string, )?array\\{/', $types[0], sprintf('DataProvider `%s@return` must return iterable of tuples (eg `iterable<string, array{string, string}>`).', $methodId));
    }

    /**
     * @dataProvider provideSrcClassCases
     * @dataProvider provideTestClassCases
     */
    public function testAllCodeContainSingleClassy(string $className): void
    {
        $headerTypes = [
            T_ABSTRACT,
            T_AS,
            T_COMMENT,
            T_DECLARE,
            T_DOC_COMMENT,
            T_FINAL,
            T_LNUMBER,
            T_NAMESPACE,
            T_NS_SEPARATOR,
            T_OPEN_TAG,
            T_STRING,
            T_USE,
            T_WHITESPACE,
        ];

        $tokens = $this->createTokensForClass($className);
        $classyIndex = null;

        self::assertTrue($tokens->isAnyTokenKindsFound(Token::getClassyTokenKinds()), sprintf('File for "%s" should contains a classy.', $className));

        $count = \count($tokens);

        for ($index = 1; $index < $count; ++$index) {
            if ($tokens[$index]->isClassy()) {
                $classyIndex = $index;

                break;
            }

            if (\defined('T_ATTRIBUTE') && $tokens[$index]->isGivenKind(T_ATTRIBUTE)) {
                $index = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_ATTRIBUTE, $index);

                continue;
            }

            if (!$tokens[$index]->isGivenKind($headerTypes) && !$tokens[$index]->equalsAny([';', '=', '(', ')'])) {
                self::fail(sprintf('File for "%s" should only contains single classy, found "%s" @ %d.', $className, $tokens[$index]->toJson(), $index));
            }
        }

        self::assertNotNull($classyIndex, sprintf('File for "%s" does not contain a classy.', $className));

        $nextTokenOfKind = $tokens->getNextTokenOfKind($classyIndex, ['{']);

        if (!\is_int($nextTokenOfKind)) {
            throw new \UnexpectedValueException('Classy without {} - braces.');
        }

        $classyEndIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_CURLY_BRACE, $nextTokenOfKind);

        self::assertNull($tokens->getNextNonWhitespace($classyEndIndex), sprintf('File for "%s" should only contains a single classy.', $className));
    }

    /**
     * @dataProvider provideSrcClassCases
     */
    public function testInheritdocIsNotAbused(string $className): void
    {
        $rc = new \ReflectionClass($className);

        $allowedMethods = array_map(
            fn (\ReflectionClass $interface): array => $this->getPublicMethodNames($interface),
            $rc->getInterfaces()
        );

        if (\count($allowedMethods) > 0) {
            $allowedMethods = array_merge(...array_values($allowedMethods));
        }

        $parentClass = $rc;
        while (false !== $parentClass = $parentClass->getParentClass()) {
            foreach ($parentClass->getMethods(\ReflectionMethod::IS_PUBLIC | \ReflectionMethod::IS_PROTECTED) as $method) {
                $allowedMethods[] = $method->getName();
            }
        }

        $allowedMethods = array_unique($allowedMethods);

        $methodsWithInheritdoc = array_filter(
            $rc->getMethods(),
            static fn (\ReflectionMethod $rm): bool => false !== $rm->getDocComment() && stripos($rm->getDocComment(), '@inheritdoc')
        );

        $methodsWithInheritdoc = array_map(
            static fn (\ReflectionMethod $rm): string => $rm->getName(),
            $methodsWithInheritdoc
        );

        $extraMethods = array_diff($methodsWithInheritdoc, $allowedMethods);

        self::assertEmpty(
            $extraMethods,
            sprintf(
                "Class '%s' should not have methods with '@inheritdoc' in PHPDoc that are not inheriting PHPDoc.\nViolations:\n%s",
                $className,
                implode("\n", array_map(static fn ($item): string => " * {$item}", $extraMethods))
            )
        );
    }

    /**
     * @return iterable<string, array{class-string}>
     */
    public static function provideSrcClassCases(): iterable
    {
        if (null === self::$srcClassCases) {
            $cases = self::getSrcClasses();

            self::$srcClassCases = array_combine(
                $cases,
                array_map(static fn (string $case): array => [$case], $cases),
            );
        }

        yield from self::$srcClassCases;
    }

    public static function provideThatSrcClassesNotAbuseInterfacesCases(): iterable
    {
        return array_map(
            static fn (string $item): array => [$item],
            array_filter(self::getSrcClasses(), static function (string $className): bool {
                $rc = new \ReflectionClass($className);

                $doc = false !== $rc->getDocComment()
                    ? new DocBlock($rc->getDocComment())
                    : null;

                if (
                    $rc->isInterface()
                    || (null !== $doc && \count($doc->getAnnotationsOfType('internal')) > 0)
                    || \in_array($className, [
                        \PhpCsFixer\Finder::class,
                        AbstractFixerTestCase::class,
                        AbstractIntegrationTestCase::class,
                        Tokens::class,
                    ], true)
                ) {
                    return false;
                }

                $interfaces = $rc->getInterfaces();
                $interfacesCount = \count($interfaces);

                if (0 === $interfacesCount) {
                    return false;
                }

                if (1 === $interfacesCount) {
                    $interface = reset($interfaces);

                    if (\Stringable::class === $interface->getName()) {
                        return false;
                    }
                }

                return true;
            })
        );
    }

    public static function provideThatSrcClassHaveTestClassCases(): iterable
    {
        return array_map(
            static fn (string $item): array => [$item],
            array_filter(
                self::getSrcClasses(),
                static function (string $className): bool {
                    $rc = new \ReflectionClass($className);

                    return !$rc->isTrait() && !$rc->isAbstract() && !$rc->isInterface() && \count($rc->getMethods()) > 0;
                }
            )
        );
    }

    public function testAllTestsForShortOpenTagAreHandled(): void
    {
        $testClassesWithShortOpenTag = array_filter(
            self::getTestClasses(),
            fn (string $className): bool => str_contains($this->getFileContentForClass($className), 'short_open_tag') && self::class !== $className
        );
        $testFilesWithShortOpenTag = array_map(
            fn (string $className): string => './'.$this->getFilePathForClass($className),
            $testClassesWithShortOpenTag
        );

        $phpunitXmlContent = file_get_contents(__DIR__.'/../../phpunit.xml.dist');
        $phpunitFiles = (array) simplexml_load_string($phpunitXmlContent)->xpath('testsuites/testsuite[@name="short-open-tag"]')[0]->file;

        sort($testFilesWithShortOpenTag);
        sort($phpunitFiles);
        self::assertSame($testFilesWithShortOpenTag, $phpunitFiles);
    }

    /**
     * @return iterable<string, array{class-string<TestCase>}>
     */
    public static function provideTestClassCases(): iterable
    {
        if (null === self::$testClassCases) {
            $cases = self::getTestClasses();

            self::$testClassCases = array_combine(
                $cases,
                array_map(static fn (string $case): array => [$case], $cases),
            );
        }

        yield from self::$testClassCases;
    }

    public static function provideThereIsNoPregFunctionUsedDirectlyCases(): iterable
    {
        return array_map(
            static fn (string $item): array => [$item],
            array_filter(
                self::getSrcClasses(),
                static fn (string $className): bool => Preg::class !== $className,
            ),
        );
    }

    /**
     * @dataProvider providePhpUnitFixerExtendsAbstractPhpUnitFixerCases
     */
    public function testPhpUnitFixerExtendsAbstractPhpUnitFixer(string $className): void
    {
        $reflection = new \ReflectionClass($className);

        self::assertTrue($reflection->isSubclassOf(AbstractPhpUnitFixer::class));
    }

    public static function providePhpUnitFixerExtendsAbstractPhpUnitFixerCases(): iterable
    {
        $factory = new FixerFactory();
        $factory->registerBuiltInFixers();

        foreach ($factory->getFixers() as $fixer) {
            if (!str_starts_with($fixer->getName(), 'php_unit_')) {
                continue;
            }

            // this one fixes usage of PHPUnit classes
            if ($fixer instanceof PhpUnitNamespacedFixer) {
                continue;
            }

            if ($fixer instanceof AbstractProxyFixer) {
                continue;
            }

            yield [\get_class($fixer)];
        }
    }

    /**
     * @dataProvider provideSrcClassCases
     * @dataProvider provideTestClassCases
     */
    public function testConstantsAreInUpperCase(string $className): void
    {
        $rc = new \ReflectionClass($className);

        $reflectionClassConstants = $rc->getReflectionConstants();

        if (\count($reflectionClassConstants) < 1) {
            $this->expectNotToPerformAssertions();

            return;
        }

        foreach ($reflectionClassConstants as $constant) {
            $constantName = $constant->getName();
            self::assertSame(strtoupper($constantName), $constantName, $className);
        }
    }

    /**
     * @return list<string>
     */
    private function extractFunctionNamesCalledInClass(string $className): array
    {
        $tokens = $this->createTokensForClass($className);

        $stringTokens = array_filter(
            $tokens->toArray(),
            static fn (Token $token): bool => $token->isGivenKind(T_STRING)
        );

        $strings = array_map(
            static fn (Token $token): string => $token->getContent(),
            $stringTokens
        );

        return array_unique($strings);
    }

    /**
     * @param class-string $className
     */
    private function getFilePathForClass(string $className): string
    {
        $file = $className;
        $file = preg_replace('#^PhpCsFixer\\\Tests\\\#', 'tests\\', $file);
        $file = preg_replace('#^PhpCsFixer\\\#', 'src\\', $file);

        return str_replace('\\', \DIRECTORY_SEPARATOR, $file).'.php';
    }

    /**
     * @param class-string $className
     */
    private function getFileContentForClass(string $className): string
    {
        return file_get_contents($this->getFilePathForClass($className));
    }

    /**
     * @param class-string $className
     */
    private function createTokensForClass(string $className): Tokens
    {
        if (!isset(self::$tokensCache[$className])) {
            self::$tokensCache[$className] = Tokens::fromCode(self::getFileContentForClass($className));
        }

        return self::$tokensCache[$className];
    }

    /**
     * @return iterable<string, string>
     */
    private function getUsedDataProviderMethodNames(string $testClassName): iterable
    {
        foreach ($this->getAnnotationsOfTestClass($testClassName, 'dataProvider') as $methodName => $dataProviderAnnotation) {
            if (1 === preg_match('/@dataProvider\s+(?P<methodName>\w+)/', $dataProviderAnnotation->getContent(), $matches)) {
                yield $methodName => $matches['methodName'];
            }
        }
    }

    /**
     * @return iterable<string, Annotation>
     */
    private function getAnnotationsOfTestClass(string $testClassName, string $annotation): iterable
    {
        $tokens = $this->createTokensForClass($testClassName);

        foreach ($tokens as $index => $token) {
            if (!$token->isGivenKind(T_DOC_COMMENT)) {
                continue;
            }

            $methodName = $tokens[$tokens->getNextTokenOfKind($index, [[T_STRING]])]->getContent();

            $docBlock = new DocBlock($token->getContent());
            $dataProviderAnnotations = $docBlock->getAnnotationsOfType($annotation);

            foreach ($dataProviderAnnotations as $dataProviderAnnotation) {
                yield $methodName => $dataProviderAnnotation;
            }
        }
    }

    /**
     * @return list<class-string>
     */
    private static function getSrcClasses(): array
    {
        static $classes;

        if (null !== $classes) {
            return $classes;
        }

        $finder = Finder::create()
            ->files()
            ->name('*.php')
            ->in(__DIR__.'/../../src')
            ->exclude([
                'Resources',
            ])
        ;

        $classes = array_map(
            static fn (SplFileInfo $file): string => sprintf(
                '%s\\%s%s%s',
                'PhpCsFixer',
                strtr($file->getRelativePath(), \DIRECTORY_SEPARATOR, '\\'),
                '' !== $file->getRelativePath() ? '\\' : '',
                $file->getBasename('.'.$file->getExtension())
            ),
            iterator_to_array($finder, false)
        );

        sort($classes);

        return $classes;
    }

    /**
     * @return list<class-string<TestCase>>
     */
    private static function getTestClasses(): array
    {
        static $classes;

        if (null !== $classes) {
            return $classes;
        }

        $finder = Finder::create()
            ->files()
            ->name('*Test.php')
            ->in(__DIR__.'/..')
            ->exclude([
                'Fixtures',
            ])
        ;

        $classes = array_map(
            static fn (SplFileInfo $file): string => sprintf(
                'PhpCsFixer\\Tests\\%s%s%s',
                strtr($file->getRelativePath(), \DIRECTORY_SEPARATOR, '\\'),
                '' !== $file->getRelativePath() ? '\\' : '',
                $file->getBasename('.'.$file->getExtension())
            ),
            iterator_to_array($finder, false)
        );

        sort($classes);

        return $classes;
    }

    /**
     * @param \ReflectionClass<object> $rc
     *
     * @return string[]
     */
    private function getPublicMethodNames(\ReflectionClass $rc): array
    {
        return array_map(
            static fn (\ReflectionMethod $rm): string => $rm->getName(),
            $rc->getMethods(\ReflectionMethod::IS_PUBLIC)
        );
    }
}