diff --git a/src/PackageVersions/ComposerV2Plugin.php b/src/PackageVersions/ComposerV2Plugin.php
deleted file mode 100644
index 8a8c887..0000000
--- a/src/PackageVersions/ComposerV2Plugin.php
+++ /dev/null
@@ -1,20 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace PackageVersions;
-
-use Composer\Composer;
-use Composer\IO\IOInterface;
-use Composer\Plugin\PluginInterface;
-
-/**
- * @internal do not rely on this: it is only here to declare the composer V2 API explicitly, even
- *           in composer V1 context.
- */
-interface ComposerV2Plugin extends PluginInterface
-{
-    public function deactivate(Composer $composer, IOInterface $io): void;
-
-    public function uninstall(Composer $composer, IOInterface $io): void;
-}
diff --git a/src/PackageVersions/Installer.php b/src/PackageVersions/Installer.php
deleted file mode 100644
index d590f64..0000000
--- a/src/PackageVersions/Installer.php
+++ /dev/null
@@ -1,234 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace PackageVersions;
-
-use Composer\Composer;
-use Composer\Config;
-use Composer\EventDispatcher\EventSubscriberInterface;
-use Composer\IO\IOInterface;
-use Composer\Package\AliasPackage;
-use Composer\Package\Locker;
-use Composer\Package\PackageInterface;
-use Composer\Package\RootPackageInterface;
-use Composer\Script\Event;
-use Composer\Script\ScriptEvents;
-use Generator;
-use RuntimeException;
-
-use function array_key_exists;
-use function array_merge;
-use function chmod;
-use function dirname;
-use function file_exists;
-use function file_put_contents;
-use function is_writable;
-use function iterator_to_array;
-use function rename;
-use function sprintf;
-use function uniqid;
-
-final class Installer implements ComposerV2Plugin, EventSubscriberInterface
-{
-    private static string $generatedClassTemplate = <<<'PHP'
-<?php
-
-declare(strict_types=1);
-
-namespace PackageVersions;
-
-use Composer\InstalledVersions;
-use OutOfBoundsException;
-
-/**
- * This class is generated by ocramius/package-versions, specifically by
- * @see \PackageVersions\Installer
- *
- * This file is overwritten at every run of `composer install` or `composer update`.
- */
-%s
-{
-    /**
-     * @deprecated please use {@see self::rootPackageName()} instead.
-     *             This constant will be removed in version 2.0.0.
-     */
-    public const ROOT_PACKAGE_NAME = '%s';
-
-    private function __construct()
-    {
-    }
-
-    /**
-     * @psalm-pure
-     *
-     * @psalm-suppress ImpureMethodCall we know that {@see InstalledVersions} interaction does not
-     *                                  cause any side effects here.
-     */
-    public static function rootPackageName() : string
-    {
-        return InstalledVersions::getRootPackage()['name'];
-    }
-
-    /**
-     * @throws OutOfBoundsException If a version cannot be located.
-     *
-     * @psalm-pure
-     *
-     * @psalm-suppress ImpureMethodCall we know that {@see InstalledVersions} interaction does not
-     *                                  cause any side effects here.
-     */
-    public static function getVersion(string $packageName) : string
-    {
-        return InstalledVersions::getPrettyVersion($packageName)
-            . '@' . InstalledVersions::getReference($packageName);
-    }
-}
-
-PHP;
-
-    public function activate(Composer $composer, IOInterface $io): void
-    {
-        // Nothing to do here, as all features are provided through event listeners
-    }
-
-    public function deactivate(Composer $composer, IOInterface $io): void
-    {
-        // Nothing to do here, as all features are provided through event listeners
-    }
-
-    public function uninstall(Composer $composer, IOInterface $io): void
-    {
-        // Nothing to do here, as all features are provided through event listeners
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    public static function getSubscribedEvents(): array
-    {
-        return [ScriptEvents::POST_AUTOLOAD_DUMP => 'dumpVersionsClass'];
-    }
-
-    /**
-     * @throws RuntimeException
-     */
-    public static function dumpVersionsClass(Event $composerEvent): void
-    {
-        $composer    = $composerEvent->getComposer();
-        $rootPackage = $composer->getPackage();
-        $versions    = iterator_to_array(self::getVersions($composer->getLocker(), $rootPackage));
-
-        if (! array_key_exists('ocramius/package-versions', $versions)) {
-            //plugin must be globally installed - we only want to generate versions for projects which specifically
-            //require ocramius/package-versions
-            return;
-        }
-
-        $versionClass = self::generateVersionsClass($rootPackage->getName());
-
-        self::writeVersionClassToFile($versionClass, $composer, $composerEvent->getIO());
-    }
-
-    /**
-     * @param string[] $versions
-     */
-    private static function generateVersionsClass(string $rootPackageName): string
-    {
-        return sprintf(
-            self::$generatedClassTemplate,
-            'fin' . 'al ' . 'cla' . 'ss ' . 'Versions', // note: workaround for regex-based code parsers :-(
-            $rootPackageName
-        );
-    }
-
-    /**
-     * @throws RuntimeException
-     */
-    private static function writeVersionClassToFile(string $versionClassSource, Composer $composer, IOInterface $io): void
-    {
-        $installPath = self::locateRootPackageInstallPath($composer->getConfig(), $composer->getPackage())
-            . '/src/PackageVersions/Versions.php';
-
-        $installDir = dirname($installPath);
-        if (! file_exists($installDir)) {
-            $io->write('<info>ocramius/package-versions:</info> Package not found (probably scheduled for removal); generation of version class skipped.');
-
-            return;
-        }
-
-        if (! is_writable($installDir)) {
-            $io->write(
-                sprintf(
-                    '<info>ocramius/package-versions:</info> %s is not writable; generation of version class skipped.',
-                    $installDir
-                )
-            );
-
-            return;
-        }
-
-        $io->write('<info>ocramius/package-versions:</info> Generating version class...');
-
-        $installPathTmp = $installPath . '_' . uniqid('tmp', true);
-        file_put_contents($installPathTmp, $versionClassSource);
-        chmod($installPathTmp, 0664);
-        rename($installPathTmp, $installPath);
-
-        $io->write('<info>ocramius/package-versions:</info> ...done generating version class');
-    }
-
-    /**
-     * @throws RuntimeException
-     */
-    private static function locateRootPackageInstallPath(
-        Config $composerConfig,
-        RootPackageInterface $rootPackage
-    ): string {
-        if (self::getRootPackageAlias($rootPackage)->getName() === 'ocramius/package-versions') {
-            return dirname($composerConfig->get('vendor-dir'));
-        }
-
-        return $composerConfig->get('vendor-dir') . '/ocramius/package-versions';
-    }
-
-    private static function getRootPackageAlias(RootPackageInterface $rootPackage): PackageInterface
-    {
-        $package = $rootPackage;
-
-        while ($package instanceof AliasPackage) {
-            $package = $package->getAliasOf();
-        }
-
-        return $package;
-    }
-
-    /**
-     * @return Generator&string[]
-     *
-     * @psalm-return Generator<string, string>
-     */
-    private static function getVersions(Locker $locker, RootPackageInterface $rootPackage): Generator
-    {
-        $lockData = $locker->getLockData();
-
-        $lockData['packages-dev'] ??= [];
-
-        foreach (array_merge($lockData['packages'], $lockData['packages-dev']) as $package) {
-            yield $package['name'] => $package['version'] . '@' . (
-                $package['source']['reference'] ?? $package['dist']['reference'] ?? ''
-            );
-        }
-
-        foreach ($rootPackage->getReplaces() as $replace) {
-            $version = $replace->getPrettyConstraint();
-            if ($version === 'self.version') {
-                $version = $rootPackage->getPrettyVersion();
-            }
-
-            yield $replace->getTarget() => $version . '@' . $rootPackage->getSourceReference();
-        }
-
-        yield $rootPackage->getName() => $rootPackage->getPrettyVersion() . '@' . $rootPackage->getSourceReference();
-    }
-}
diff --git a/src/PackageVersions/Versions.php b/src/PackageVersions/Versions.php
index 83033ac..f622268 100644
--- a/src/PackageVersions/Versions.php
+++ b/src/PackageVersions/Versions.php
@@ -7,22 +7,8 @@
 use Composer\InstalledVersions;
 use OutOfBoundsException;
 
-/**
- * This is a stub class: it is in place only for scenarios where PackageVersions
- * is installed with a `--no-scripts` flag, in which scenarios the Versions class
- * is not being replaced.
- *
- * If you are reading this docBlock inside your `vendor/` dir, then this means
- * that PackageVersions didn't correctly install, and is in "fallback" mode.
- */
 final class Versions
 {
-    /**
-     * @deprecated please use {@see self::rootPackageName()} instead.
-     *             This constant will be removed in version 2.0.0.
-     */
-    public const ROOT_PACKAGE_NAME = 'unknown/root-package@UNKNOWN';
-
     private function __construct()
     {
     }
@@ -48,13 +34,6 @@ public static function rootPackageName() : string
      */
     public static function getVersion(string $packageName) : string
     {
-        /** @psalm-suppress DeprecatedConstant */
-        if ($packageName === self::ROOT_PACKAGE_NAME) {
-            $rootPackage = InstalledVersions::getRootPackage();
-
-            return $rootPackage['pretty_version'] . '@' . $rootPackage['reference'];
-        }
-
         return InstalledVersions::getPrettyVersion($packageName)
             . '@' . InstalledVersions::getReference($packageName);
     }
diff --git a/test/PackageVersionsTest/InstallerTest.php b/test/PackageVersionsTest/InstallerTest.php
deleted file mode 100644
index 6ed1d86..0000000
--- a/test/PackageVersionsTest/InstallerTest.php
+++ /dev/null
@@ -1,989 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace PackageVersionsTest;
-
-use Composer\Composer;
-use Composer\Config;
-use Composer\EventDispatcher\EventDispatcher;
-use Composer\Installer\InstallationManager;
-use Composer\IO\IOInterface;
-use Composer\Package\Link;
-use Composer\Package\Locker;
-use Composer\Package\RootAliasPackage;
-use Composer\Package\RootPackage;
-use Composer\Package\RootPackageInterface;
-use Composer\Repository\InstalledRepositoryInterface;
-use Composer\Repository\RepositoryManager;
-use Composer\Script\Event;
-use PackageVersions\Installer;
-use PHPUnit\Framework\Exception;
-use PHPUnit\Framework\MockObject\MockObject;
-use PHPUnit\Framework\TestCase;
-use ReflectionClass;
-use RuntimeException;
-
-use function array_filter;
-use function array_map;
-use function chmod;
-use function file_get_contents;
-use function file_put_contents;
-use function fileperms;
-use function in_array;
-use function is_dir;
-use function mkdir;
-use function preg_match_all;
-use function realpath;
-use function rmdir;
-use function scandir;
-use function sprintf;
-use function strpos;
-use function substr;
-use function sys_get_temp_dir;
-use function uniqid;
-use function unlink;
-
-use const PHP_OS;
-
-/**
- * @covers \PackageVersions\Installer
- */
-final class InstallerTest extends TestCase
-{
-    /** @var Composer&MockObject */
-    private $composer;
-
-    /** @var EventDispatcher&MockObject */
-    private $eventDispatcher;
-
-    /** @var IOInterface&MockObject */
-    private $io;
-
-    private Installer $installer;
-
-    /**
-     * {@inheritDoc}
-     *
-     * @throws Exception
-     */
-    protected function setUp(): void
-    {
-        parent::setUp();
-
-        $this->installer       = new Installer();
-        $this->io              = $this->createMock(IOInterface::class);
-        $this->composer        = $this->createMock(Composer::class);
-        $this->eventDispatcher = $this->createMock(EventDispatcher::class);
-
-        $this->composer->expects(self::any())->method('getEventDispatcher')->willReturn($this->eventDispatcher);
-    }
-
-    public function testGetSubscribedEvents(): void
-    {
-        $events = Installer::getSubscribedEvents();
-
-        self::assertSame(
-            ['post-autoload-dump' => 'dumpVersionsClass'],
-            $events
-        );
-
-        foreach ($events as $callback) {
-            self::assertIsCallable([$this->installer, $callback]);
-        }
-    }
-
-    public function testDumpVersionsClassIfExistingFileIsNotWritable(): void
-    {
-        $config            = $this->createMock(Config::class);
-        $locker            = $this->createMock(Locker::class);
-        $repositoryManager = $this->createMock(RepositoryManager::class);
-        $installManager    = $this->createMock(InstallationManager::class);
-        $repository        = $this->createMock(InstalledRepositoryInterface::class);
-
-        $vendorDir = sys_get_temp_dir() . '/' . uniqid('InstallerTest', true);
-
-        $expectedPath = $vendorDir . '/ocramius/package-versions/src/PackageVersions';
-
-        /** @noinspection MkdirRaceConditionInspection */
-        mkdir($expectedPath, 0777, true);
-
-        $expectedFileName = $expectedPath . '/Versions.php';
-        file_put_contents($expectedFileName, 'NOT PHP!');
-        chmod($expectedFileName, 0444);
-
-        $locker
-            ->method('getLockData')
-            ->willReturn([
-                'packages' => [
-                    [
-                        'name'    => 'ocramius/package-versions',
-                        'version' => '1.0.0',
-                    ],
-                ],
-            ]);
-
-        $repositoryManager->method('getLocalRepository')->willReturn($repository);
-
-        $this->composer->method('getConfig')->willReturn($config);
-        $this->composer->method('getLocker')->willReturn($locker);
-        $this->composer->method('getRepositoryManager')->willReturn($repositoryManager);
-        $this->composer->method('getPackage')->willReturn($this->getRootPackageMock());
-        $this->composer->method('getInstallationManager')->willReturn($installManager);
-
-        $config->method('get')->with('vendor-dir')->willReturn($vendorDir);
-
-        Installer::dumpVersionsClass(new Event(
-            'post-install-cmd',
-            $this->composer,
-            $this->io
-        ));
-
-        self::assertStringStartsWith('<?php', file_get_contents($expectedFileName));
-
-        $this->rmDir($vendorDir);
-    }
-
-    public function testDumpVersionsClassIfReadonlyFilesystem(): void
-    {
-        $config            = $this->createMock(Config::class);
-        $locker            = $this->createMock(Locker::class);
-        $repositoryManager = $this->createMock(RepositoryManager::class);
-        $installManager    = $this->createMock(InstallationManager::class);
-        $repository        = $this->createMock(InstalledRepositoryInterface::class);
-
-        $vendorDir = sys_get_temp_dir() . '/' . uniqid('InstallerTest', true);
-
-        $expectedPath = $vendorDir . '/ocramius/package-versions/src/PackageVersions';
-
-        /** @noinspection MkdirRaceConditionInspection */
-        mkdir($expectedPath, 0700, true);
-
-        $expectedFileName = $expectedPath . '/Versions.php';
-        file_put_contents($expectedFileName, 'NOT PHP!');
-        chmod($expectedFileName, 0400);
-        chmod($expectedPath, 0400);
-
-        $locker
-            ->method('getLockData')
-            ->willReturn([
-                'packages' => [
-                    [
-                        'name'    => 'ocramius/package-versions',
-                        'version' => '1.0.0',
-                    ],
-                ],
-            ]);
-
-        $repositoryManager->method('getLocalRepository')->willReturn($repository);
-
-        $this->composer->method('getConfig')->willReturn($config);
-        $this->composer->method('getLocker')->willReturn($locker);
-        $this->composer->method('getRepositoryManager')->willReturn($repositoryManager);
-        $this->composer->method('getPackage')->willReturn($this->getRootPackageMock());
-        $this->composer->method('getInstallationManager')->willReturn($installManager);
-
-        $config->method('get')->with('vendor-dir')->willReturn($vendorDir);
-
-        Installer::dumpVersionsClass(new Event(
-            'post-install-cmd',
-            $this->composer,
-            $this->io
-        ));
-
-        chmod($expectedPath, 0700);
-        chmod($expectedFileName, 0600);
-
-        self::assertSame('NOT PHP!', file_get_contents($expectedFileName));
-
-        $this->rmDir($vendorDir);
-    }
-
-    public function testDumpVersionsClass(): void
-    {
-        $config            = $this->getMockBuilder(Config::class)->disableOriginalConstructor()->getMock();
-        $locker            = $this->getMockBuilder(Locker::class)->disableOriginalConstructor()->getMock();
-        $repositoryManager = $this->getMockBuilder(RepositoryManager::class)->disableOriginalConstructor()->getMock();
-        $installManager    = $this->getMockBuilder(InstallationManager::class)->disableOriginalConstructor()->getMock();
-        $repository        = $this->createMock(InstalledRepositoryInterface::class);
-
-        $vendorDir = sys_get_temp_dir() . '/' . uniqid('InstallerTest', true);
-
-        $expectedPath = $vendorDir . '/ocramius/package-versions/src/PackageVersions';
-
-        /** @noinspection MkdirRaceConditionInspection */
-        mkdir($expectedPath, 0777, true);
-
-        $locker
-            ->expects(self::any())
-            ->method('getLockData')
-            ->willReturn([
-                'packages' => [
-                    [
-                        'name'    => 'ocramius/package-versions',
-                        'version' => '1.0.0',
-                    ],
-                    [
-                        'name'    => 'foo/bar',
-                        'version' => '1.2.3',
-                        'source'  => ['reference' => 'abc123'],
-                    ],
-                    [
-                        'name'    => 'baz/tab',
-                        'version' => '4.5.6',
-                        'source'  => ['reference' => 'def456'],
-                    ],
-                ],
-                'packages-dev' => [
-                    [
-                        'name'    => 'tar/taz',
-                        'version' => '7.8.9',
-                        'source'  => ['reference' => 'ghi789'],
-                    ],
-                ],
-            ]);
-
-        $repositoryManager->expects(self::any())->method('getLocalRepository')->willReturn($repository);
-
-        $this->composer->expects(self::any())->method('getConfig')->willReturn($config);
-        $this->composer->expects(self::any())->method('getLocker')->willReturn($locker);
-        $this->composer->expects(self::any())->method('getRepositoryManager')->willReturn($repositoryManager);
-        $this->composer->expects(self::any())->method('getPackage')->willReturn($this->getRootPackageMock());
-        $this->composer->expects(self::any())->method('getInstallationManager')->willReturn($installManager);
-
-        $config->expects(self::any())->method('get')->with('vendor-dir')->willReturn($vendorDir);
-
-        Installer::dumpVersionsClass(new Event(
-            'post-install-cmd',
-            $this->composer,
-            $this->io
-        ));
-
-        $expectedSource = <<<'PHP'
-<?php
-
-declare(strict_types=1);
-
-namespace PackageVersions;
-
-use Composer\InstalledVersions;
-use OutOfBoundsException;
-
-/**
- * This class is generated by ocramius/package-versions, specifically by
- * @see \PackageVersions\Installer
- *
- * This file is overwritten at every run of `composer install` or `composer update`.
- */
-final class Versions
-{
-    /**
-     * @deprecated please use {@see self::rootPackageName()} instead.
-     *             This constant will be removed in version 2.0.0.
-     */
-    public const ROOT_PACKAGE_NAME = 'root/package';
-
-    private function __construct()
-    {
-    }
-
-    /**
-     * @psalm-pure
-     *
-     * @psalm-suppress ImpureMethodCall we know that {@see InstalledVersions} interaction does not
-     *                                  cause any side effects here.
-     */
-    public static function rootPackageName() : string
-    {
-        return InstalledVersions::getRootPackage()['name'];
-    }
-
-    /**
-     * @throws OutOfBoundsException If a version cannot be located.
-     *
-     * @psalm-pure
-     *
-     * @psalm-suppress ImpureMethodCall we know that {@see InstalledVersions} interaction does not
-     *                                  cause any side effects here.
-     */
-    public static function getVersion(string $packageName) : string
-    {
-        return InstalledVersions::getPrettyVersion($packageName)
-            . '@' . InstalledVersions::getReference($packageName);
-    }
-}
-
-PHP;
-
-        self::assertSame($expectedSource, file_get_contents($expectedPath . '/Versions.php'));
-
-        $this->rmDir($vendorDir);
-    }
-
-    public function testDumpVersionsClassNoDev(): void
-    {
-        $config            = $this->getMockBuilder(Config::class)->disableOriginalConstructor()->getMock();
-        $locker            = $this->getMockBuilder(Locker::class)->disableOriginalConstructor()->getMock();
-        $repositoryManager = $this->getMockBuilder(RepositoryManager::class)->disableOriginalConstructor()->getMock();
-        $installManager    = $this->getMockBuilder(InstallationManager::class)->disableOriginalConstructor()->getMock();
-        $repository        = $this->createMock(InstalledRepositoryInterface::class);
-
-        $vendorDir = sys_get_temp_dir() . '/' . uniqid('InstallerTest', true);
-
-        $expectedPath = $vendorDir . '/ocramius/package-versions/src/PackageVersions';
-
-        /** @noinspection MkdirRaceConditionInspection */
-        mkdir($expectedPath, 0777, true);
-
-        $locker
-            ->expects(self::any())
-            ->method('getLockData')
-            ->willReturn([
-                'packages' => [
-                    [
-                        'name'    => 'ocramius/package-versions',
-                        'version' => '1.0.0',
-                    ],
-                    [
-                        'name'    => 'foo/bar',
-                        'version' => '1.2.3',
-                        'source'  => ['reference' => 'abc123'],
-                    ],
-                    [
-                        'name'    => 'baz/tab',
-                        'version' => '4.5.6',
-                        'source'  => ['reference' => 'def456'],
-                    ],
-                ],
-            ]);
-
-        $repositoryManager->expects(self::any())->method('getLocalRepository')->willReturn($repository);
-
-        $this->composer->expects(self::any())->method('getConfig')->willReturn($config);
-        $this->composer->expects(self::any())->method('getLocker')->willReturn($locker);
-        $this->composer->expects(self::any())->method('getRepositoryManager')->willReturn($repositoryManager);
-        $this->composer->expects(self::any())->method('getPackage')->willReturn($this->getRootPackageMock());
-        $this->composer->expects(self::any())->method('getInstallationManager')->willReturn($installManager);
-
-        $config->expects(self::any())->method('get')->with('vendor-dir')->willReturn($vendorDir);
-
-        Installer::dumpVersionsClass(new Event(
-            'post-install-cmd',
-            $this->composer,
-            $this->io
-        ));
-
-        $expectedSource = <<<'PHP'
-<?php
-
-declare(strict_types=1);
-
-namespace PackageVersions;
-
-use Composer\InstalledVersions;
-use OutOfBoundsException;
-
-/**
- * This class is generated by ocramius/package-versions, specifically by
- * @see \PackageVersions\Installer
- *
- * This file is overwritten at every run of `composer install` or `composer update`.
- */
-final class Versions
-{
-    /**
-     * @deprecated please use {@see self::rootPackageName()} instead.
-     *             This constant will be removed in version 2.0.0.
-     */
-    public const ROOT_PACKAGE_NAME = 'root/package';
-
-    private function __construct()
-    {
-    }
-
-    /**
-     * @psalm-pure
-     *
-     * @psalm-suppress ImpureMethodCall we know that {@see InstalledVersions} interaction does not
-     *                                  cause any side effects here.
-     */
-    public static function rootPackageName() : string
-    {
-        return InstalledVersions::getRootPackage()['name'];
-    }
-
-    /**
-     * @throws OutOfBoundsException If a version cannot be located.
-     *
-     * @psalm-pure
-     *
-     * @psalm-suppress ImpureMethodCall we know that {@see InstalledVersions} interaction does not
-     *                                  cause any side effects here.
-     */
-    public static function getVersion(string $packageName) : string
-    {
-        return InstalledVersions::getPrettyVersion($packageName)
-            . '@' . InstalledVersions::getReference($packageName);
-    }
-}
-
-PHP;
-
-        self::assertSame($expectedSource, file_get_contents($expectedPath . '/Versions.php'));
-
-        $this->rmDir($vendorDir);
-    }
-
-    /**
-     * @throws RuntimeException
-     *
-     * @group #12
-     */
-    public function testDumpVersionsWithoutPackageSourceDetails(): void
-    {
-        $config            = $this->getMockBuilder(Config::class)->disableOriginalConstructor()->getMock();
-        $locker            = $this->getMockBuilder(Locker::class)->disableOriginalConstructor()->getMock();
-        $repositoryManager = $this->getMockBuilder(RepositoryManager::class)->disableOriginalConstructor()->getMock();
-        $installManager    = $this->getMockBuilder(InstallationManager::class)->disableOriginalConstructor()->getMock();
-        $repository        = $this->createMock(InstalledRepositoryInterface::class);
-
-        $vendorDir = sys_get_temp_dir() . '/' . uniqid('InstallerTest', true);
-
-        $expectedPath = $vendorDir . '/ocramius/package-versions/src/PackageVersions';
-
-        /** @noinspection MkdirRaceConditionInspection */
-        mkdir($expectedPath, 0777, true);
-
-        $locker
-            ->expects(self::any())
-            ->method('getLockData')
-            ->willReturn([
-                'packages' => [
-                    [
-                        'name'    => 'ocramius/package-versions',
-                        'version' => '1.0.0',
-                    ],
-                    [
-                        'name'    => 'foo/bar',
-                        'version' => '1.2.3',
-                        'dist'  => ['reference' => 'abc123'], // version defined in the dist, this time
-                    ],
-                    [
-                        'name'    => 'baz/tab',
-                        'version' => '4.5.6', // source missing
-                    ],
-                ],
-            ]);
-
-        $repositoryManager->expects(self::any())->method('getLocalRepository')->willReturn($repository);
-
-        $this->composer->expects(self::any())->method('getConfig')->willReturn($config);
-        $this->composer->expects(self::any())->method('getLocker')->willReturn($locker);
-        $this->composer->expects(self::any())->method('getRepositoryManager')->willReturn($repositoryManager);
-        $this->composer->expects(self::any())->method('getPackage')->willReturn($this->getRootPackageMock());
-        $this->composer->expects(self::any())->method('getInstallationManager')->willReturn($installManager);
-
-        $config->expects(self::any())->method('get')->with('vendor-dir')->willReturn($vendorDir);
-
-        Installer::dumpVersionsClass(new Event(
-            'post-install-cmd',
-            $this->composer,
-            $this->io
-        ));
-
-        $expectedSource = <<<'PHP'
-<?php
-
-declare(strict_types=1);
-
-namespace PackageVersions;
-
-use Composer\InstalledVersions;
-use OutOfBoundsException;
-
-/**
- * This class is generated by ocramius/package-versions, specifically by
- * @see \PackageVersions\Installer
- *
- * This file is overwritten at every run of `composer install` or `composer update`.
- */
-final class Versions
-{
-    /**
-     * @deprecated please use {@see self::rootPackageName()} instead.
-     *             This constant will be removed in version 2.0.0.
-     */
-    public const ROOT_PACKAGE_NAME = 'root/package';
-
-    private function __construct()
-    {
-    }
-
-    /**
-     * @psalm-pure
-     *
-     * @psalm-suppress ImpureMethodCall we know that {@see InstalledVersions} interaction does not
-     *                                  cause any side effects here.
-     */
-    public static function rootPackageName() : string
-    {
-        return InstalledVersions::getRootPackage()['name'];
-    }
-
-    /**
-     * @throws OutOfBoundsException If a version cannot be located.
-     *
-     * @psalm-pure
-     *
-     * @psalm-suppress ImpureMethodCall we know that {@see InstalledVersions} interaction does not
-     *                                  cause any side effects here.
-     */
-    public static function getVersion(string $packageName) : string
-    {
-        return InstalledVersions::getPrettyVersion($packageName)
-            . '@' . InstalledVersions::getReference($packageName);
-    }
-}
-
-PHP;
-
-        self::assertSame($expectedSource, file_get_contents($expectedPath . '/Versions.php'));
-
-        $this->rmDir($vendorDir);
-    }
-
-    /**
-     * @throws RuntimeException
-     *
-     * @dataProvider rootPackageProvider
-     */
-    public function testDumpsVersionsClassToSpecificLocation(RootPackageInterface $rootPackage, bool $inVendor): void
-    {
-        $config            = $this->getMockBuilder(Config::class)->disableOriginalConstructor()->getMock();
-        $locker            = $this->getMockBuilder(Locker::class)->disableOriginalConstructor()->getMock();
-        $repositoryManager = $this->getMockBuilder(RepositoryManager::class)->disableOriginalConstructor()->getMock();
-        $installManager    = $this->getMockBuilder(InstallationManager::class)->disableOriginalConstructor()->getMock();
-        $repository        = $this->createMock(InstalledRepositoryInterface::class);
-
-        $vendorDir = sys_get_temp_dir() . '/' . uniqid('InstallerTest', true) . '/vendor';
-
-        /** @noinspection MkdirRaceConditionInspection */
-        mkdir($vendorDir, 0777, true);
-
-        /** @noinspection RealpathInSteamContextInspection */
-        $expectedPath = $inVendor
-            ? $vendorDir . '/ocramius/package-versions/src/PackageVersions'
-            : realpath($vendorDir . '/..') . '/src/PackageVersions';
-
-        /** @noinspection MkdirRaceConditionInspection */
-        mkdir($expectedPath, 0777, true);
-
-        $locker
-            ->expects(self::any())
-            ->method('getLockData')
-            ->willReturn([
-                'packages' => [
-                    [
-                        'name'    => 'ocramius/package-versions',
-                        'version' => '1.0.0',
-                    ],
-                ],
-                'packages-dev' => [],
-            ]);
-
-        $repositoryManager->expects(self::any())->method('getLocalRepository')->willReturn($repository);
-
-        $this->composer->expects(self::any())->method('getConfig')->willReturn($config);
-        $this->composer->expects(self::any())->method('getLocker')->willReturn($locker);
-        $this->composer->expects(self::any())->method('getRepositoryManager')->willReturn($repositoryManager);
-        $this->composer->expects(self::any())->method('getPackage')->willReturn($rootPackage);
-        $this->composer->expects(self::any())->method('getInstallationManager')->willReturn($installManager);
-
-        $config->expects(self::any())->method('get')->with('vendor-dir')->willReturn($vendorDir);
-
-        Installer::dumpVersionsClass(new Event(
-            'post-install-cmd',
-            $this->composer,
-            $this->io
-        ));
-
-        $generatedSource = file_get_contents($expectedPath . '/Versions.php');
-
-        self::assertStringNotContainsString(
-            'unknown/root-package@UNKNOWN',
-            $generatedSource
-        );
-
-        self::assertStringMatchesFormat(
-            '%Aclass Versions%AROOT_PACKAGE_NAME%A',
-            $generatedSource
-        );
-
-        $this->rmDir($vendorDir);
-    }
-
-    /**
-     * @return bool[][]|RootPackageInterface[][] the root package and whether the versions class is to be generated in
-     *                                           the vendor dir or not
-     */
-    public function rootPackageProvider(): array
-    {
-        $baseRootPackage                         = new RootPackage('root/package', '1.2.3', '1.2.3');
-        $aliasRootPackage                        = new RootAliasPackage($baseRootPackage, '1.2.3', '1.2.3');
-        $indirectAliasRootPackage                = new RootAliasPackage($aliasRootPackage, '1.2.3', '1.2.3');
-        $packageVersionsRootPackage              = new RootPackage('ocramius/package-versions', '1.2.3', '1.2.3');
-        $aliasPackageVersionsRootPackage         = new RootAliasPackage($packageVersionsRootPackage, '1.2.3', '1.2.3');
-        $indirectAliasPackageVersionsRootPackage = new RootAliasPackage(
-            $aliasPackageVersionsRootPackage,
-            '1.2.3',
-            '1.2.3'
-        );
-
-        return [
-            'root package is not ocramius/package-versions' => [
-                $baseRootPackage,
-                true,
-            ],
-            'alias root package is not ocramius/package-versions' => [
-                $aliasRootPackage,
-                true,
-            ],
-            'indirect alias root package is not ocramius/package-versions' => [
-                $indirectAliasRootPackage,
-                true,
-            ],
-            'root package is ocramius/package-versions' => [
-                $packageVersionsRootPackage,
-                false,
-            ],
-            'alias root package is ocramius/package-versions' => [
-                $aliasPackageVersionsRootPackage,
-                false,
-            ],
-            'indirect alias root package is ocramius/package-versions' => [
-                $indirectAliasPackageVersionsRootPackage,
-                false,
-            ],
-        ];
-    }
-
-    public function testVersionsAreNotDumpedIfPackageVersionsNotExplicitlyRequired(): void
-    {
-        $config            = $this->getMockBuilder(Config::class)->disableOriginalConstructor()->getMock();
-        $locker            = $this->getMockBuilder(Locker::class)->disableOriginalConstructor()->getMock();
-        $repositoryManager = $this->getMockBuilder(RepositoryManager::class)->disableOriginalConstructor()->getMock();
-        $installManager    = $this->getMockBuilder(InstallationManager::class)->disableOriginalConstructor()->getMock();
-        $repository        = $this->createMock(InstalledRepositoryInterface::class);
-        $package           = $this->createMock(RootPackageInterface::class);
-
-        $vendorDir = sys_get_temp_dir() . '/' . uniqid('InstallerTest', true);
-
-        $expectedPath = $vendorDir . '/ocramius/package-versions/src/PackageVersions';
-
-        /** @noinspection MkdirRaceConditionInspection */
-        mkdir($expectedPath, 0777, true);
-
-        $locker
-            ->expects(self::any())
-            ->method('getLockData')
-            ->willReturn([
-                'packages' => [
-                    [
-                        'name'    => 'foo/bar',
-                        'version' => '1.2.3',
-                        'dist'  => ['reference' => 'abc123'], // version defined in the dist, this time
-                    ],
-                    [
-                        'name'    => 'baz/tab',
-                        'version' => '4.5.6', // source missing
-                    ],
-                ],
-            ]);
-
-        $repositoryManager->expects(self::any())->method('getLocalRepository')->willReturn($repository);
-
-        $this->composer->expects(self::any())->method('getConfig')->willReturn($config);
-        $this->composer->expects(self::any())->method('getLocker')->willReturn($locker);
-        $this->composer->expects(self::any())->method('getRepositoryManager')->willReturn($repositoryManager);
-        $this->composer->expects(self::any())->method('getPackage')->willReturn($package);
-        $this->composer->expects(self::any())->method('getInstallationManager')->willReturn($installManager);
-
-        $package->expects(self::any())->method('getName')->willReturn('root/package');
-        $package->expects(self::any())->method('getVersion')->willReturn('1.3.5');
-        $package->expects(self::any())->method('getSourceReference')->willReturn('aaabbbcccddd');
-        $package->expects(self::any())->method('getReplaces')->willReturn([]);
-
-        $config->expects(self::any())->method('get')->with('vendor-dir')->willReturn($vendorDir);
-
-        Installer::dumpVersionsClass(new Event(
-            'post-install-cmd',
-            $this->composer,
-            $this->io
-        ));
-
-        self::assertFileDoesNotExist($expectedPath . '/Versions.php');
-
-        $this->rmDir($vendorDir);
-    }
-
-    /**
-     * @group #41
-     * @group #46
-     */
-    public function testVersionsAreNotDumpedIfPackageIsScheduledForRemoval(): void
-    {
-        $config  = $this->getMockBuilder(Config::class)->disableOriginalConstructor()->getMock();
-        $locker  = $this->getMockBuilder(Locker::class)->disableOriginalConstructor()->getMock();
-        $package = $this->createMock(RootPackageInterface::class);
-        $package->expects(self::any())->method('getReplaces')->willReturn([]);
-        $vendorDir    = sys_get_temp_dir() . '/' . uniqid('InstallerTest', true);
-        $expectedPath = $vendorDir . '/ocramius/package-versions/src/PackageVersions';
-
-        $locker
-            ->expects(self::any())
-            ->method('getLockData')
-            ->willReturn([
-                'packages' => [
-                    [
-                        'name'    => 'ocramius/package-versions',
-                        'version' => '1.0.0',
-                    ],
-                ],
-            ]);
-
-        $package->expects(self::any())->method('getName')->willReturn('root/package');
-
-        $this->composer->expects(self::any())->method('getConfig')->willReturn($config);
-        $this->composer->expects(self::any())->method('getLocker')->willReturn($locker);
-        $this->composer->expects(self::any())->method('getPackage')->willReturn($package);
-
-        $config->expects(self::any())->method('get')->with('vendor-dir')->willReturn($vendorDir);
-
-        Installer::dumpVersionsClass(new Event(
-            'post-install-cmd',
-            $this->composer,
-            $this->io
-        ));
-
-        self::assertFileDoesNotExist($expectedPath . '/Versions.php');
-        self::assertFileDoesNotExist($expectedPath . '/Versions.php');
-    }
-
-    public function testGeneratedVersionFileAccessRights(): void
-    {
-        if (strpos(PHP_OS, 'WIN') === 0) {
-            $this->markTestSkipped('Windows is kinda "meh" at file access levels');
-        }
-
-        $config            = $this->getMockBuilder(Config::class)->disableOriginalConstructor()->getMock();
-        $locker            = $this->getMockBuilder(Locker::class)->disableOriginalConstructor()->getMock();
-        $repositoryManager = $this->getMockBuilder(RepositoryManager::class)->disableOriginalConstructor()->getMock();
-        $installManager    = $this->getMockBuilder(InstallationManager::class)->disableOriginalConstructor()->getMock();
-        $repository        = $this->createMock(InstalledRepositoryInterface::class);
-        $package           = $this->createMock(RootPackageInterface::class);
-        $package->expects(self::any())->method('getReplaces')->willReturn([]);
-
-        $vendorDir = sys_get_temp_dir() . '/' . uniqid('InstallerTest', true);
-
-        $expectedPath = $vendorDir . '/ocramius/package-versions/src/PackageVersions';
-
-        /** @noinspection MkdirRaceConditionInspection */
-        mkdir($expectedPath, 0777, true);
-
-        $locker
-            ->expects(self::any())
-            ->method('getLockData')
-            ->willReturn([
-                'packages' => [
-                    [
-                        'name'    => 'ocramius/package-versions',
-                        'version' => '1.0.0',
-                    ],
-                ],
-            ]);
-
-        $repositoryManager->expects(self::any())->method('getLocalRepository')->willReturn($repository);
-
-        $this->composer->expects(self::any())->method('getConfig')->willReturn($config);
-        $this->composer->expects(self::any())->method('getLocker')->willReturn($locker);
-        $this->composer->expects(self::any())->method('getRepositoryManager')->willReturn($repositoryManager);
-        $this->composer->expects(self::any())->method('getPackage')->willReturn($package);
-        $this->composer->expects(self::any())->method('getInstallationManager')->willReturn($installManager);
-
-        $package->expects(self::any())->method('getName')->willReturn('root/package');
-        $package->expects(self::any())->method('getVersion')->willReturn('1.3.5');
-        $package->expects(self::any())->method('getSourceReference')->willReturn('aaabbbcccddd');
-
-        $config->expects(self::any())->method('get')->with('vendor-dir')->willReturn($vendorDir);
-
-        Installer::dumpVersionsClass(new Event(
-            'post-install-cmd',
-            $this->composer,
-            $this->io
-        ));
-
-        $filePath = $expectedPath . '/Versions.php';
-
-        self::assertFileExists($filePath);
-        self::assertSame('0664', substr(sprintf('%o', fileperms($filePath)), -4));
-
-        $this->rmDir($vendorDir);
-    }
-
-    private function rmDir(string $directory): void
-    {
-        if (! is_dir($directory)) {
-            unlink($directory);
-
-            return;
-        }
-
-        array_map(
-            function ($item) use ($directory): void {
-                $this->rmDir($directory . '/' . $item);
-            },
-            array_filter(
-                scandir($directory),
-                static function (string $dirItem) {
-                    return ! in_array($dirItem, ['.', '..'], true);
-                }
-            )
-        );
-
-        rmdir($directory);
-    }
-
-    /**
-     * @group composer/composer#5237
-     */
-    public function testWillEscapeRegexParsingOfClassDefinitions(): void
-    {
-        self::assertSame(
-            1,
-            preg_match_all(
-                '{^((?:final\s+)?(?:\s*))class\s+(\S+)}mi',
-                file_get_contents((new ReflectionClass(Installer::class))->getFileName())
-            )
-        );
-    }
-
-    public function testGetVersionsIsNotNormalizedForRootPackage(): void
-    {
-        $config            = $this->getMockBuilder(Config::class)->disableOriginalConstructor()->getMock();
-        $locker            = $this->getMockBuilder(Locker::class)->disableOriginalConstructor()->getMock();
-        $repositoryManager = $this->getMockBuilder(RepositoryManager::class)->disableOriginalConstructor()->getMock();
-        $installManager    = $this->getMockBuilder(InstallationManager::class)->disableOriginalConstructor()->getMock();
-        $repository        = $this->createMock(InstalledRepositoryInterface::class);
-
-        $vendorDir = sys_get_temp_dir() . '/' . uniqid('InstallerTest', true);
-
-        $expectedPath = $vendorDir . '/ocramius/package-versions/src/PackageVersions';
-
-        /** @noinspection MkdirRaceConditionInspection */
-        mkdir($expectedPath, 0777, true);
-
-        $locker
-            ->expects(self::any())
-            ->method('getLockData')
-            ->willReturn([
-                'packages' => [
-                    [
-                        'name'    => 'ocramius/package-versions',
-                        'version' => '1.0.0',
-                    ],
-                ],
-            ]);
-
-        $repositoryManager->expects(self::any())->method('getLocalRepository')->willReturn($repository);
-
-        $this->composer->expects(self::any())->method('getConfig')->willReturn($config);
-        $this->composer->expects(self::any())->method('getLocker')->willReturn($locker);
-        $this->composer->expects(self::any())->method('getRepositoryManager')->willReturn($repositoryManager);
-        $this->composer->expects(self::any())->method('getPackage')->willReturn($this->getRootPackageMock());
-        $this->composer->expects(self::any())->method('getInstallationManager')->willReturn($installManager);
-
-        $config->expects(self::any())->method('get')->with('vendor-dir')->willReturn($vendorDir);
-
-        Installer::dumpVersionsClass(new Event(
-            'post-install-cmd',
-            $this->composer,
-            $this->io
-        ));
-
-        $expectedSource = <<<'PHP'
-<?php
-
-declare(strict_types=1);
-
-namespace PackageVersions;
-
-use Composer\InstalledVersions;
-use OutOfBoundsException;
-
-/**
- * This class is generated by ocramius/package-versions, specifically by
- * @see \PackageVersions\Installer
- *
- * This file is overwritten at every run of `composer install` or `composer update`.
- */
-final class Versions
-{
-    /**
-     * @deprecated please use {@see self::rootPackageName()} instead.
-     *             This constant will be removed in version 2.0.0.
-     */
-    public const ROOT_PACKAGE_NAME = 'root/package';
-
-    private function __construct()
-    {
-    }
-
-    /**
-     * @psalm-pure
-     *
-     * @psalm-suppress ImpureMethodCall we know that {@see InstalledVersions} interaction does not
-     *                                  cause any side effects here.
-     */
-    public static function rootPackageName() : string
-    {
-        return InstalledVersions::getRootPackage()['name'];
-    }
-
-    /**
-     * @throws OutOfBoundsException If a version cannot be located.
-     *
-     * @psalm-pure
-     *
-     * @psalm-suppress ImpureMethodCall we know that {@see InstalledVersions} interaction does not
-     *                                  cause any side effects here.
-     */
-    public static function getVersion(string $packageName) : string
-    {
-        return InstalledVersions::getPrettyVersion($packageName)
-            . '@' . InstalledVersions::getReference($packageName);
-    }
-}
-
-PHP;
-
-        self::assertSame($expectedSource, file_get_contents($expectedPath . '/Versions.php'));
-
-        $this->rmDir($vendorDir);
-    }
-
-    private function getRootPackageMock(): RootPackageInterface
-    {
-        $package = $this->createMock(RootPackageInterface::class);
-        $package->expects(self::any())->method('getName')->willReturn('root/package');
-        $package->expects(self::any())->method('getPrettyVersion')->willReturn('1.3.5');
-        $package->expects(self::any())->method('getSourceReference')->willReturn('aaabbbcccddd');
-
-        $link = $this->createMock(Link::class);
-        $link->expects(self::any())->method('getTarget')->willReturn('some-replaced/package');
-        $link->expects(self::any())->method('getPrettyConstraint')->willReturn('self.version');
-
-        $package->expects(self::any())->method('getReplaces')->willReturn([$link]);
-
-        return $package;
-    }
-}
diff --git a/test/PackageVersionsTest/VersionsTest.php b/test/PackageVersionsTest/VersionsTest.php
index 63d5ce7..59160eb 100644
--- a/test/PackageVersionsTest/VersionsTest.php
+++ b/test/PackageVersionsTest/VersionsTest.php
@@ -36,7 +36,7 @@ public function testValidVersions(): void
     public function testCanRetrieveRootPackageVersion(): void
     {
         /** @psalm-suppress DeprecatedConstant */
-        self::assertMatchesRegularExpression('/^.+\@[0-9a-f]+$/', Versions::getVersion(Versions::ROOT_PACKAGE_NAME));
+        self::assertMatchesRegularExpression('/^.+\@[0-9a-f]+$/', Versions::getVersion(Versions::rootPackageName()));
     }
 
     /** @group #153 */