diff --git a/.github/workflows/rector.yml b/.github/workflows/rector.yml
new file mode 100644
index 0000000..595f673
--- /dev/null
+++ b/.github/workflows/rector.yml
@@ -0,0 +1,49 @@
+name: Rector
+
+on: [push, pull_request]
+
+jobs:
+  rector:
+    name: Rector
+    runs-on: [ubuntu-latest]
+
+    steps:
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.1
+
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress --ignore-platform-req=ext-*
+
+      - name: Restore result cache
+        uses: actions/cache/restore@v4
+        with:
+          path: .rector.result.cache
+          key: rector-result-cache-${{ github.run_id }}
+          restore-keys: |
+            rector-result-cache-
+
+      - name: Rector
+        run: php vendor/bin/rector process --config .rector.php --dry-run
+
+      - name: Save result cache
+        uses: actions/cache/save@v4
+        if: always()
+        with:
+          path: .rector.result.cache
+          key: rector-result-cache-${{ github.run_id }}
diff --git a/.gitignore b/.gitignore
index fc32c58..2acd102 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 /vendor
 /.phpstan.cache
 /.phpunit.cache
+/.rector.result.cache
 .php-cs-fixer.cache
 .phpmd.result-cache.php
 composer.lock
diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index 7675a54..930aa14 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -9,7 +9,7 @@
         'modernize_types_casting' => true,
         'nullable_type_declaration_for_default_null_value' => true,
         'single_quote' => true,
-        'php_unit_test_case_static_method_calls' => true,
+        'php_unit_test_case_static_method_calls' => ['call_type' => 'self'],
         'trailing_comma_in_multiline' => ['after_heredoc' => true, 'elements' => ['arguments', 'array_destructuring', 'arrays']],
     ])
     ->setFinder(
diff --git a/.rector.php b/.rector.php
new file mode 100644
index 0000000..e0835aa
--- /dev/null
+++ b/.rector.php
@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Caching\ValueObject\Storage\FileCacheStorage;
+use Rector\Config\RectorConfig;
+use Rector\PHPUnit\CodeQuality\Rector\Class_\PreferPHPUnitThisCallRector;
+
+try {
+    return RectorConfig::configure()
+        ->withFileExtensions(['php'])
+        ->withCache(
+            cacheDirectory: '.rector.result.cache',
+            cacheClass: FileCacheStorage::class,
+        )
+        ->withPhpSets(
+            php81: true,
+        )
+        ->withPaths([
+            __DIR__,
+        ])
+        ->withSkipPath(__DIR__ . '/vendor')
+        ->withSkip([
+            # skip: use static methods
+            PreferPHPUnitThisCallRector::class
+        ])
+        ->withPreparedSets(
+            deadCode: true,
+            codeQuality: true,
+            codingStyle: true,
+            typeDeclarations: true,
+            privatization: true,
+            naming: true,
+            instanceOf: true,
+            earlyReturn: true,
+            strictBooleans: false,
+            carbon: true,
+            rectorPreset: true,
+            phpunitCodeQuality: true,
+            doctrineCodeQuality: false,
+            symfonyCodeQuality: false,
+            symfonyConfigs: false,
+        );
+} catch (InvalidConfigurationException $exception) {
+    echo $exception->getMessage();
+    exit(1);
+}
diff --git a/composer.json b/composer.json
index 705353f..8b94696 100644
--- a/composer.json
+++ b/composer.json
@@ -33,7 +33,8 @@
 		"phpstan/phpstan-phpunit": "^2.0",
 		"phpunit/phpunit": "^9.6",
 		"phpmd/phpmd": "^2.15",
-		"friendsofphp/php-cs-fixer": "^3.67"
+		"friendsofphp/php-cs-fixer": "^3.67",
+		"rector/rector": "^2.1.2"
 	},
 	"extra": {
 		"class": "OpenMage\\ComposerPlugin\\Plugin"
@@ -46,7 +47,9 @@
 		"phpstan:baseline": "XDEBUG_MODE=off php vendor/bin/phpstan analyze -b .phpstan.dist.baseline.neon",
 		"phpunit:test": "XDEBUG_MODE=off php vendor/bin/phpunit --configuration .phpunit.dist.xml --no-coverage",
 		"phpunit:coverage": "XDEBUG_MODE=coverage php vendor/bin/phpunit --configuration .phpunit.dist.xml --testdox",
-		"phpunit:coverage-local": "XDEBUG_MODE=coverage php vendor/bin/phpunit --configuration .phpunit.dist.xml --coverage-html build/coverage-composer-plugin --testdox"
+		"phpunit:coverage-local": "XDEBUG_MODE=coverage php vendor/bin/phpunit --configuration .phpunit.dist.xml --coverage-html build/coverage-composer-plugin --testdox",
+		"rector:test": "vendor/bin/rector process --config .rector.php --dry-run",
+		"rector:fix": "vendor/bin/rector process --config .rector.php"
 	},
 	"scripts-descriptions": {
 		"php-cs-fixer:test": "Run php-cs-fixer",
@@ -56,7 +59,9 @@
 		"phpstan:baseline": "Run phpstan and update baseline",
 		"phpunit:test": "Run PHPUnit",
 		"phpunit:coverage": "Run PHPUnit with code coverage (requires XDEBUG enabled)",
-		"phpunit:coverage-local": "Run PHPUnit with local HTML code coverage (requires XDEBUG enabled)"
+		"phpunit:coverage-local": "Run PHPUnit with local HTML code coverage (requires XDEBUG enabled)",
+		"rector:test": "Run rector",
+		"rector:fix": "Run rector and fix issues"
 	},
 	"funding": [
 		{
diff --git a/src/OpenMage/ComposerPlugin/Copy/AbstractCopyPlugin.php b/src/OpenMage/ComposerPlugin/Copy/AbstractCopyPlugin.php
index 1ab8a48..45821ca 100644
--- a/src/OpenMage/ComposerPlugin/Copy/AbstractCopyPlugin.php
+++ b/src/OpenMage/ComposerPlugin/Copy/AbstractCopyPlugin.php
@@ -59,7 +59,7 @@ public function __construct(?Event $event)
     public function processComposerInstall(): void
     {
         $package = $this->getComposerPackage();
-        if (!$package || !$this instanceof CopyFromComposerInterface) {
+        if (!$package instanceof BasePackage || !$this instanceof CopyFromComposerInterface) {
             return;
         }
 
@@ -74,13 +74,14 @@ public function processComposerInstall(): void
         $filesystem = $this->getFileSystem();
 
         if (!$filesystem->exists($copySourcePath) && $this instanceof CopyFromUnpkgInterface) {
-            if ($event && $event->getIO()->isVerbose()) {
+            if ($event instanceof Event && $event->getIO()->isVerbose()) {
                 $event->getIO()->write(sprintf(
                     'Fallback to Unpkg %s for %s',
                     $this->getUnpkgName(),
                     $this->getComposerName(),
                 ));
             }
+
             $this->processUnpkgInstall();
             return;
         }
@@ -96,11 +97,11 @@ public function processComposerInstall(): void
 
             try {
                 $filesystem->copy($copySource, $copytarget);
-                if ($event && $event->getIO()->isVeryVerbose()) {
+                if ($event instanceof Event && $event->getIO()->isVeryVerbose()) {
                     $event->getIO()->write(sprintf('Copy %s to %s', $copySource, $copytarget));
                 }
             } catch (IOException $exception) {
-                if ($event) {
+                if ($event instanceof Event) {
                     $event->getIO()->write($exception->getMessage());
                 }
             }
@@ -119,7 +120,7 @@ public function processUnpkgInstall(): void
         $event      = $this->getEvent();
         $sourcePath = $this->getUnpkSourcePath();
 
-        if ($event && $event->getIO()->isVerbose()) {
+        if ($event instanceof Event && $event->getIO()->isVerbose()) {
             $event->getIO()->write(sprintf(
                 'Trying to download %s %s from %s',
                 $this->getUnpkgName(),
@@ -133,29 +134,32 @@ public function processUnpkgInstall(): void
             try {
                 $content = file_get_contents($sourceFilePath);
             } catch (ErrorException $errorException) {
-                if ($event) {
+                if ($event instanceof Event) {
                     $event->getIO()->write($errorException->getMessage());
                 }
+
                 return;
             }
 
             if (!$content) {
-                if ($event) {
+                if ($event instanceof Event) {
                     $event->getIO()->write(sprintf('Could not read from %s', $sourceFilePath));
                 }
+
                 return;
             }
 
             try {
                 $targetFilePath = $this->getCopyTargetPath() . '/' . $fileName;
                 $this->getFileSystem()->dumpFile($targetFilePath, $content);
-                if ($event && $event->getIO()->isVerbose()) {
+                if ($event instanceof Event && $event->getIO()->isVerbose()) {
                     $event->getIO()->write(sprintf('Added %s', $targetFilePath));
                 }
             } catch (IOException $exception) {
-                if ($event) {
+                if ($event instanceof Event) {
                     $event->getIO()->write($exception->getMessage());
                 }
+
                 return;
             }
         }
@@ -169,27 +173,29 @@ public function getComposerPackage(): ?BasePackage
 
         $vendorName = $this->getComposerName();
         $module = $this->getInstalledComposerPackage($vendorName);
-        if ($module) {
+        if ($module instanceof BasePackage) {
             return $module;
         }
 
         $event = $this->getEvent();
-        if (!$event) {
+        if (!$event instanceof Event) {
             return null;
         }
 
         $locker = $event->getComposer()->getLocker();
-        $repo   = $locker->getLockedRepository();
+        $lockArrayRepository   = $locker->getLockedRepository();
 
-        foreach ($repo->getPackages() as $package) {
-            if ($package->getName() === $vendorName) {
-                $this->setInstalledComposerPackage($vendorName, $package);
+        foreach ($lockArrayRepository->getPackages() as $basePackage) {
+            if ($basePackage->getName() === $vendorName) {
+                $this->setInstalledComposerPackage($vendorName, $basePackage);
                 if ($event->getIO()->isVerbose()) {
-                    $event->getIO()->write(sprintf('%s found with version %s', $vendorName, $package->getVersion()));
+                    $event->getIO()->write(sprintf('%s found with version %s', $vendorName, $basePackage->getVersion()));
                 }
+
                 return $this->getInstalledComposerPackage($vendorName);
             }
         }
+
         return null;
     }
 
@@ -202,8 +208,9 @@ protected function getUnpkSourcePath(): string
             $search  = ['{{package}}', '{{version}}'];
             $replace = [$this->getUnpkgName(), $this->getUnpkgVersion()];
             $path    = str_replace($search, $replace, CopyFromUnpkgInterface::UNPKG_URL);
-            return $path . ($this->getUnpkgSource() ? $this->getUnpkgSource() . '/' : '');
+            return $path . ($this->getUnpkgSource() !== '' && $this->getUnpkgSource() !== '0' ? $this->getUnpkgSource() . '/' : '');
         }
+
         return '';
     }
 
@@ -216,6 +223,7 @@ protected function getCwd(): string
         if ($cwd === false) {
             throw new Exception('This should not happen.');
         }
+
         return $cwd;
     }
 
@@ -225,7 +233,7 @@ protected function getCwd(): string
     protected function getVendorDirectoryFromComposer(): string
     {
         $event = $this->getEvent();
-        if (!$event) {
+        if (!$event instanceof Event) {
             return '';
         }
 
@@ -240,22 +248,20 @@ protected function getVendorDirectoryFromComposer(): string
     protected function getMageRootDirectoryFromComposer(): string
     {
         $event = $this->getEvent();
-        if (!$event) {
+        if (!$event instanceof Event) {
             return '';
         }
 
         $composerExtra  = $event->getComposer()->getPackage()->getExtra();
-        $magentoRootDir = '';
-
         if (array_key_exists(self::EXTRA_MAGENTO_ROOT_DIR, $composerExtra) &&
-            $composerExtra[self::EXTRA_MAGENTO_ROOT_DIR] !== '.'
-        ) {
-            $magentoRootDir = $composerExtra[self::EXTRA_MAGENTO_ROOT_DIR] . '/';
+            $composerExtra[self::EXTRA_MAGENTO_ROOT_DIR] !== '.') {
+            return $composerExtra[self::EXTRA_MAGENTO_ROOT_DIR] . '/';
         }
-        return $magentoRootDir;
+
+        return '';
     }
 
-    private function getCopyTargetPath(): string
+    protected function getCopyTargetPath(): string
     {
         return sprintf(
             '%s/%s%s',
@@ -270,9 +276,9 @@ protected function getInstalledComposerPackage(string $vendorName): ?BasePackage
         return $this->composerPackages[$vendorName] ?? null;
     }
 
-    private function setInstalledComposerPackage(string $vendorName, BasePackage $package): void
+    protected function setInstalledComposerPackage(string $vendorName, BasePackage $basePackage): void
     {
-        $this->composerPackages[$vendorName] = $package;
+        $this->composerPackages[$vendorName] = $basePackage;
     }
 
     public function getFileSystem(): Filesystem
diff --git a/src/OpenMage/ComposerPlugin/Copy/CopyInterface.php b/src/OpenMage/ComposerPlugin/Copy/CopyInterface.php
index 6f292d1..9ce67ee 100644
--- a/src/OpenMage/ComposerPlugin/Copy/CopyInterface.php
+++ b/src/OpenMage/ComposerPlugin/Copy/CopyInterface.php
@@ -17,7 +17,9 @@
 interface CopyInterface
 {
     public const EXTRA_MAGENTO_ROOT_DIR = 'magento-root-dir';
+
     public const EXTRA_UNPKG_PACKAGES   = 'openmage-unpkg-packages';
+
     public const VENDOR_DIR             = 'vendor-dir';
 
     public function getCopyTarget(): string;
diff --git a/src/OpenMage/ComposerPlugin/Copy/Plugins/TinyMce.php b/src/OpenMage/ComposerPlugin/Copy/Plugins/TinyMce.php
index 553eb09..788ecbd 100644
--- a/src/OpenMage/ComposerPlugin/Copy/Plugins/TinyMce.php
+++ b/src/OpenMage/ComposerPlugin/Copy/Plugins/TinyMce.php
@@ -21,6 +21,7 @@
 class TinyMce extends Copy\AbstractCopyPlugin implements Copy\CopyFromComposerInterface
 {
     public const TINYMCE_LICENSE_FILE       = 'LICENSE_TINYMCE.txt';
+
     public const TINYMCE_LICENSE_NOTE       = 'LICENSE_TINYMCE_OPENMAGE.txt';
 
     public const TINYMCE_LICENSE_FILE_TEXT  = <<<TEXT
@@ -66,15 +67,19 @@ public function processComposerInstall(): void
 
         $package = $this->getComposerPackage();
         if (!$package instanceof BasePackage) {
+            $this->removedTinyMceLicenseFiles();
             return;
         }
 
         $version = $package->getVersion();
-        switch ((int) $version[0]) {
+        $versionParts = explode('.', $version);
+        $versionMain = (int) $versionParts[0];
+
+        switch ($versionMain) {
             case 6:
                 $this->removedTinyMceLicenseFiles();
                 break;
-            case 7:
+            default:
                 $this->addTinyMceLicenseFile();
                 $this->addTinyMceLicenseNote();
                 break;
@@ -90,9 +95,9 @@ private function addTinyMceLicenseFile(): void
             if (!is_null($this->event) && $this->event->getIO()->isVerbose()) {
                 $this->event->getIO()->write(sprintf('Added %s', self::TINYMCE_LICENSE_FILE));
             }
-        } catch (IOException $exception) {
+        } catch (IOException $ioException) {
             if (!is_null($this->event)) {
-                $this->event->getIO()->write($exception->getMessage());
+                $this->event->getIO()->write($ioException->getMessage());
             }
         }
     }
@@ -111,9 +116,9 @@ private function addTinyMceLicenseNote(): void
             if (!is_null($this->event) && $this->event->getIO()->isVerbose()) {
                 $this->event->getIO()->write(sprintf('Added %s', self::TINYMCE_LICENSE_NOTE));
             }
-        } catch (IOException $exception) {
+        } catch (IOException $ioException) {
             if (!is_null($this->event)) {
-                $this->event->getIO()->write($exception->getMessage());
+                $this->event->getIO()->write($ioException->getMessage());
             }
         }
     }
@@ -130,9 +135,9 @@ private function removedTinyMceLicenseFiles(): void
             if (!is_null($this->event) && $this->event->getIO()->isVeryVerbose()) {
                 $this->event->getIO()->write(sprintf('Removed %s and %s', self::TINYMCE_LICENSE_FILE, self::TINYMCE_LICENSE_NOTE));
             }
-        } catch (IOException $exception) {
+        } catch (IOException $ioException) {
             if (!is_null($this->event)) {
-                $this->event->getIO()->write($exception->getMessage());
+                $this->event->getIO()->write($ioException->getMessage());
             }
         }
     }
diff --git a/src/OpenMage/ComposerPlugin/Copy/Plugins/TinyMceLanguages.php b/src/OpenMage/ComposerPlugin/Copy/Plugins/TinyMceLanguages.php
index c69b270..7ed8da3 100644
--- a/src/OpenMage/ComposerPlugin/Copy/Plugins/TinyMceLanguages.php
+++ b/src/OpenMage/ComposerPlugin/Copy/Plugins/TinyMceLanguages.php
@@ -54,6 +54,7 @@ public function processComposerInstall(): void
         if (!InstalledVersions::isInstalled(self::TINYMCE)) {
             return;
         }
+
         parent::processComposerInstall();
     }
 }
diff --git a/src/OpenMage/ComposerPlugin/Copy/Unpkg/Config.php b/src/OpenMage/ComposerPlugin/Copy/Unpkg/Config.php
index 8aa1080..7eb744b 100644
--- a/src/OpenMage/ComposerPlugin/Copy/Unpkg/Config.php
+++ b/src/OpenMage/ComposerPlugin/Copy/Unpkg/Config.php
@@ -19,13 +19,19 @@
 class Config implements Copy\CopyFromUnpkgInterface
 {
     public const CONFIG_FILES   = 'files';
+
     public const CONFIG_SOURCE  = 'source';
+
     public const CONFIG_TARGET  = 'target';
+
     public const CONFIG_VERSION = 'version';
 
     private string $name    = '';
+
     private string $version = '';
+
     private string $source  = '';
+
     private string $target  = '';
 
     /**
@@ -75,6 +81,7 @@ private function validateConfigFiles(array $packageConfig): ?array
             $files = $packageConfig[self::CONFIG_FILES];
             return $files;
         }
+
         return null;
     }
 
@@ -86,6 +93,7 @@ private function validateConfigVersion(array $packageConfig): ?string
         if (array_key_exists(self::CONFIG_VERSION, $packageConfig) && is_string($packageConfig[self::CONFIG_VERSION])) {
             return trim($packageConfig[self::CONFIG_VERSION]);
         }
+
         return null;
     }
 
@@ -97,6 +105,7 @@ private function validateConfigSource(array $packageConfig): string
         if (array_key_exists(self::CONFIG_SOURCE, $packageConfig) && is_string($packageConfig[self::CONFIG_SOURCE])) {
             return trim($packageConfig[self::CONFIG_SOURCE]);
         }
+
         return '';
     }
 
@@ -109,6 +118,7 @@ private function validateConfigTarget(array $packageConfig): string
             $target = str_replace(['../', './'], '', $packageConfig[self::CONFIG_TARGET]);
             return trim($target);
         }
+
         return '';
     }
 
diff --git a/src/OpenMage/ComposerPlugin/Plugin.php b/src/OpenMage/ComposerPlugin/Plugin.php
index bfc713f..0782bc9 100644
--- a/src/OpenMage/ComposerPlugin/Plugin.php
+++ b/src/OpenMage/ComposerPlugin/Plugin.php
@@ -86,6 +86,7 @@ public function processCopy(?Event $event): void
                 $pluginLoaded->processComposerInstall();
                 continue;
             }
+
             if ($pluginLoaded instanceof Copy\AbstractCopyPlugin &&
                 $pluginLoaded instanceof Copy\CopyFromUnpkgInterface
             ) {
@@ -93,14 +94,14 @@ public function processCopy(?Event $event): void
                 continue;
             }
 
-            if ($this->io) {
+            if ($this->io instanceof IOInterface) {
                 $this->io->write('Could not load ' . $plugin);
             }
         }
 
         $plugins = $this->getUnpkgPackagesFromConfig();
-        foreach ($plugins as $pluginConfig) {
-            $pluginLoaded = new Generic($event, $pluginConfig);
+        foreach ($plugins as $plugin) {
+            $pluginLoaded = new Generic($event, $plugin);
             $pluginLoaded->processUnpkgInstall();
         }
     }
@@ -125,9 +126,10 @@ private function getUnpkgPackagesFromConfig(): array
         $config = $extra[CopyInterface::EXTRA_UNPKG_PACKAGES];
 
         if (!is_array($config)) {
-            if ($this->io) {
+            if ($this->io instanceof IOInterface) {
                 $this->io->write(sprintf('Configuration is invalid for %s', CopyInterface::EXTRA_UNPKG_PACKAGES));
             }
+
             return $packages;
         }
 
@@ -135,9 +137,10 @@ private function getUnpkgPackagesFromConfig(): array
             $config = new Config();
             $packageConfig = $config->getValidatedConfig($packageConfig);
             if (!$packageConfig) {
-                if ($this->io) {
+                if ($this->io instanceof IOInterface) {
                     $this->io->write(sprintf('Configuration is invalid for %s', $packageName));
                 }
+
                 continue;
             }
 
@@ -150,6 +153,7 @@ private function getUnpkgPackagesFromConfig(): array
 
             $packages[] = $config;
         }
+
         return $packages;
     }
 
@@ -163,6 +167,7 @@ private function getPlugins(string $path): array
         foreach ($filenames as $filename) {
             $namespaces[] = $this->getFullNamespace($filename) . '\\' . $this->getClassName($filename);
         }
+
         return $namespaces;
     }
 
@@ -198,6 +203,7 @@ private function getFilenames(string $path): array
         foreach ($finderFiles as $finderFile) {
             $filenames[] = $finderFile->getRealPath();
         }
+
         return $filenames;
     }
 }
diff --git a/tests/unit/Copy/AbstractCopyPluginTest.php b/tests/unit/Copy/AbstractCopyPluginTest.php
index 878b998..283c4da 100644
--- a/tests/unit/Copy/AbstractCopyPluginTest.php
+++ b/tests/unit/Copy/AbstractCopyPluginTest.php
@@ -21,11 +21,11 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Filesystem\Filesystem;
 
-class AbstractCopyPluginTest extends TestCase
+final class AbstractCopyPluginTest extends TestCase
 {
-    public Subject $subject;
+    public \PHPUnit\Framework\MockObject\MockObject $subject;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->subject = $this->getMockForAbstractClass(Subject::class, [], '', false);
     }
@@ -35,6 +35,6 @@ public function setUp(): void
      */
     public function testGetFileSystem(): void
     {
-        static::assertInstanceOf(Filesystem::class, $this->subject->getFileSystem());
+        self::assertInstanceOf(Filesystem::class, $this->subject->getFileSystem());
     }
 }
diff --git a/tests/unit/Copy/Plugins/ChartJsTest.php b/tests/unit/Copy/Plugins/ChartJsTest.php
index f37ad4d..d88fe8a 100644
--- a/tests/unit/Copy/Plugins/ChartJsTest.php
+++ b/tests/unit/Copy/Plugins/ChartJsTest.php
@@ -21,11 +21,11 @@
 use OutOfBoundsException;
 use PHPUnit\Framework\TestCase;
 
-class ChartJsTest extends TestCase
+final class ChartJsTest extends TestCase
 {
     public Subject $subject;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->subject = new Subject(null);
     }
@@ -35,7 +35,7 @@ public function setUp(): void
      */
     public function testGetUnpkgName(): void
     {
-        static::assertSame('chart.js', $this->subject->getUnpkgName());
+        self::assertSame('chart.js', $this->subject->getUnpkgName());
     }
 
     /**
@@ -45,9 +45,9 @@ public function testGetUnpkgName(): void
     public function testGetUnpkgVersion(): void
     {
         try {
-            static::assertIsString($this->subject->getUnpkgVersion());
-        } catch (OutOfBoundsException $exception) {
-            static::assertSame('Package "nnnick/chartjs" is not installed', $exception->getMessage());
+            self::assertIsString($this->subject->getUnpkgVersion());
+        } catch (OutOfBoundsException $outOfBoundsException) {
+            self::assertSame('Package "nnnick/chartjs" is not installed', $outOfBoundsException->getMessage());
         }
     }
 
@@ -56,7 +56,7 @@ public function testGetUnpkgVersion(): void
      */
     public function testGetUnpkgSource(): void
     {
-        static::assertSame('dist', $this->subject->getUnpkgSource());
+        self::assertSame('dist', $this->subject->getUnpkgSource());
     }
 
 
@@ -71,7 +71,7 @@ public function testGetUnpkgFiles(): void
             2 => 'helpers.js',
             3 => 'helpers.js.map',
         ];
-        static::assertSame($result, $this->subject->getUnpkgFiles());
+        self::assertSame($result, $this->subject->getUnpkgFiles());
     }
 
     /**
@@ -79,7 +79,7 @@ public function testGetUnpkgFiles(): void
      */
     public function testGetComposerName(): void
     {
-        static::assertSame('nnnick/chartjs', $this->subject->getComposerName());
+        self::assertSame('nnnick/chartjs', $this->subject->getComposerName());
     }
 
     /**
@@ -87,7 +87,7 @@ public function testGetComposerName(): void
      */
     public function testGetComposerSource(): void
     {
-        static::assertSame('dist', $this->subject->getComposerSource());
+        self::assertSame('dist', $this->subject->getComposerSource());
     }
 
     /**
@@ -95,7 +95,7 @@ public function testGetComposerSource(): void
      */
     public function testGetComposerFiles(): void
     {
-        static::assertSame(['*.js', '*.map'], $this->subject->getComposerFiles());
+        self::assertSame(['*.js', '*.map'], $this->subject->getComposerFiles());
     }
 
     /**
@@ -103,6 +103,6 @@ public function testGetComposerFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        static::assertSame('js/lib/chartjs', $this->subject->getCopyTarget());
+        self::assertSame('js/lib/chartjs', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/Copy/Plugins/FlatpickrTest.php b/tests/unit/Copy/Plugins/FlatpickrTest.php
index a900916..2629815 100644
--- a/tests/unit/Copy/Plugins/FlatpickrTest.php
+++ b/tests/unit/Copy/Plugins/FlatpickrTest.php
@@ -21,11 +21,11 @@
 use OutOfBoundsException;
 use PHPUnit\Framework\TestCase;
 
-class FlatpickrTest extends TestCase
+final class FlatpickrTest extends TestCase
 {
     public Subject $subject;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->subject = new Subject(null);
     }
@@ -35,7 +35,7 @@ public function setUp(): void
      */
     public function testGetUnpkgName(): void
     {
-        static::assertSame('flatpickr', $this->subject->getUnpkgName());
+        self::assertSame('flatpickr', $this->subject->getUnpkgName());
     }
 
     /**
@@ -44,9 +44,9 @@ public function testGetUnpkgName(): void
     public function testGetUnpkgVersion(): void
     {
         try {
-            static::assertIsString($this->subject->getUnpkgVersion());
-        } catch (OutOfBoundsException $exception) {
-            static::assertSame('Package "nnnick/chartjs" is not installed', $exception->getMessage());
+            self::assertIsString($this->subject->getUnpkgVersion());
+        } catch (OutOfBoundsException $outOfBoundsException) {
+            self::assertSame('Package "nnnick/chartjs" is not installed', $outOfBoundsException->getMessage());
         }
     }
 
@@ -55,7 +55,7 @@ public function testGetUnpkgVersion(): void
      */
     public function testGetUnpkgSource(): void
     {
-        static::assertSame('dist', $this->subject->getUnpkgSource());
+        self::assertSame('dist', $this->subject->getUnpkgSource());
     }
 
     /**
@@ -67,7 +67,7 @@ public function testGetUnpkgFiles(): void
             0 => 'flatpickr.min.css',
             1 => 'flatpickr.min.js',
         ];
-        static::assertSame($result, $this->subject->getUnpkgFiles());
+        self::assertSame($result, $this->subject->getUnpkgFiles());
     }
 
     /**
@@ -75,6 +75,6 @@ public function testGetUnpkgFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        static::assertSame('js/lib/flatpickr', $this->subject->getCopyTarget());
+        self::assertSame('js/lib/flatpickr', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/Copy/Plugins/FlowJsTest.php b/tests/unit/Copy/Plugins/FlowJsTest.php
index 3b537c6..f2382b0 100644
--- a/tests/unit/Copy/Plugins/FlowJsTest.php
+++ b/tests/unit/Copy/Plugins/FlowJsTest.php
@@ -20,11 +20,11 @@
 use OpenMage\ComposerPlugin\Copy\Plugins\FlowJs as Subject;
 use PHPUnit\Framework\TestCase;
 
-class FlowJsTest extends TestCase
+final class FlowJsTest extends TestCase
 {
     public Subject $subject;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->subject = new Subject(null);
     }
@@ -34,7 +34,7 @@ public function setUp(): void
      */
     public function testGetComposerName(): void
     {
-        static::assertSame('flowjs/flowjs', $this->subject->getComposerName());
+        self::assertSame('flowjs/flowjs', $this->subject->getComposerName());
     }
 
     /**
@@ -42,7 +42,7 @@ public function testGetComposerName(): void
      */
     public function testGetComposerSource(): void
     {
-        static::assertSame('dist', $this->subject->getComposerSource());
+        self::assertSame('dist', $this->subject->getComposerSource());
     }
 
     /**
@@ -50,7 +50,7 @@ public function testGetComposerSource(): void
      */
     public function testGetComposerFiles(): void
     {
-        static::assertSame(['*.js'], $this->subject->getComposerFiles());
+        self::assertSame(['*.js'], $this->subject->getComposerFiles());
     }
 
     /**
@@ -58,6 +58,6 @@ public function testGetComposerFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        static::assertSame('js/lib/uploader', $this->subject->getCopyTarget());
+        self::assertSame('js/lib/uploader', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/Copy/Plugins/JQueryTest.php b/tests/unit/Copy/Plugins/JQueryTest.php
index 4ea3dc1..7fb9aac 100644
--- a/tests/unit/Copy/Plugins/JQueryTest.php
+++ b/tests/unit/Copy/Plugins/JQueryTest.php
@@ -20,11 +20,11 @@
 use OpenMage\ComposerPlugin\Copy\Plugins\JQuery as Subject;
 use PHPUnit\Framework\TestCase;
 
-class JQueryTest extends TestCase
+final class JQueryTest extends TestCase
 {
     public Subject $subject;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->subject = new Subject(null);
     }
@@ -34,7 +34,7 @@ public function setUp(): void
      */
     public function testGetComposerName(): void
     {
-        static::assertSame('components/jquery', $this->subject->getComposerName());
+        self::assertSame('components/jquery', $this->subject->getComposerName());
     }
 
     /**
@@ -42,7 +42,7 @@ public function testGetComposerName(): void
      */
     public function testGetComposerSource(): void
     {
-        static::assertSame('', $this->subject->getComposerSource());
+        self::assertSame('', $this->subject->getComposerSource());
     }
 
     /**
@@ -50,7 +50,7 @@ public function testGetComposerSource(): void
      */
     public function testGetComposerFiles(): void
     {
-        static::assertSame(['*.js', '*.map'], $this->subject->getComposerFiles());
+        self::assertSame(['*.js', '*.map'], $this->subject->getComposerFiles());
     }
 
     /**
@@ -58,6 +58,6 @@ public function testGetComposerFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        static::assertSame('js/lib/jquery', $this->subject->getCopyTarget());
+        self::assertSame('js/lib/jquery', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/Copy/Plugins/TinyMceLanguagesTest.php b/tests/unit/Copy/Plugins/TinyMceLanguagesTest.php
index 7454238..7cf9e99 100644
--- a/tests/unit/Copy/Plugins/TinyMceLanguagesTest.php
+++ b/tests/unit/Copy/Plugins/TinyMceLanguagesTest.php
@@ -21,11 +21,11 @@
 use OutOfBoundsException;
 use PHPUnit\Framework\TestCase;
 
-class TinyMceLanguagesTest extends TestCase
+final class TinyMceLanguagesTest extends TestCase
 {
     public Subject $subject;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->subject = new Subject(null);
     }
@@ -35,7 +35,7 @@ public function setUp(): void
      */
     public function testGetComposerName(): void
     {
-        static::assertSame('mklkj/tinymce-i18n', $this->subject->getComposerName());
+        self::assertSame('mklkj/tinymce-i18n', $this->subject->getComposerName());
     }
 
     /**
@@ -44,9 +44,9 @@ public function testGetComposerName(): void
     public function testGetComposerSource(): void
     {
         try {
-            static::assertSame('langs7', $this->subject->getComposerSource());
-        } catch (OutOfBoundsException $exception) {
-            static::assertSame('Package "tinymce/tinymce" is not installed', $exception->getMessage());
+            self::assertSame('langs7', $this->subject->getComposerSource());
+        } catch (OutOfBoundsException $outOfBoundsException) {
+            self::assertSame('Package "tinymce/tinymce" is not installed', $outOfBoundsException->getMessage());
         }
     }
 
@@ -55,7 +55,7 @@ public function testGetComposerSource(): void
      */
     public function testGetComposerFiles(): void
     {
-        static::assertSame(['*.css', '*.js'], $this->subject->getComposerFiles());
+        self::assertSame(['*.css', '*.js'], $this->subject->getComposerFiles());
     }
 
     /**
@@ -63,6 +63,6 @@ public function testGetComposerFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        static::assertSame('js/lib/tinymce/langs', $this->subject->getCopyTarget());
+        self::assertSame('js/lib/tinymce/langs', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/Copy/Plugins/TinyMceTest.php b/tests/unit/Copy/Plugins/TinyMceTest.php
index 0e7f306..0c03a9a 100644
--- a/tests/unit/Copy/Plugins/TinyMceTest.php
+++ b/tests/unit/Copy/Plugins/TinyMceTest.php
@@ -20,11 +20,11 @@
 use OpenMage\ComposerPlugin\Copy\Plugins\TinyMce as Subject;
 use PHPUnit\Framework\TestCase;
 
-class TinyMceTest extends TestCase
+final class TinyMceTest extends TestCase
 {
     public Subject $subject;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->subject = new Subject(null);
     }
@@ -34,7 +34,7 @@ public function setUp(): void
      */
     public function testGetComposerName(): void
     {
-        static::assertSame('tinymce/tinymce', $this->subject->getComposerName());
+        self::assertSame('tinymce/tinymce', $this->subject->getComposerName());
     }
 
     /**
@@ -42,7 +42,7 @@ public function testGetComposerName(): void
      */
     public function testGetComposerSource(): void
     {
-        static::assertSame('', $this->subject->getComposerSource());
+        self::assertSame('', $this->subject->getComposerSource());
     }
 
     /**
@@ -50,7 +50,7 @@ public function testGetComposerSource(): void
      */
     public function testGetComposerFiles(): void
     {
-        static::assertSame(['*.css', '*.js'], $this->subject->getComposerFiles());
+        self::assertSame(['*.css', '*.js'], $this->subject->getComposerFiles());
     }
 
     /**
@@ -58,6 +58,6 @@ public function testGetComposerFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        static::assertSame('js/lib/tinymce', $this->subject->getCopyTarget());
+        self::assertSame('js/lib/tinymce', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/Copy/Unpkg/ConfigTest.php b/tests/unit/Copy/Unpkg/ConfigTest.php
index c597708..87853f5 100644
--- a/tests/unit/Copy/Unpkg/ConfigTest.php
+++ b/tests/unit/Copy/Unpkg/ConfigTest.php
@@ -21,11 +21,11 @@
 use OpenMage\ComposerPlugin\Copy\Unpkg\Config as Subject;
 use PHPUnit\Framework\TestCase;
 
-class ConfigTest extends TestCase
+final class ConfigTest extends TestCase
 {
     public Subject $subject;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->subject = new Subject(null);
     }
@@ -34,9 +34,9 @@ public function setUp(): void
      * @covers \OpenMage\ComposerPlugin\Copy\Unpkg\Config::getValidatedConfig()
      * @dataProvider provideGetValidatedConfig
      */
-    public function testGetValidatedConfig(?array $expectedResult, $packageConfig): void
+    public function testGetValidatedConfig(?array $expectedResult, ?array $packageConfig): void
     {
-        static::assertSame($expectedResult, $this->subject->getValidatedConfig($packageConfig));
+        self::assertSame($expectedResult, $this->subject->getValidatedConfig($packageConfig));
     }
 
     public function provideGetValidatedConfig(): Generator
@@ -152,7 +152,7 @@ public function testUnpkgName(): void
     {
         $source = '';
         $this->subject->setUnpkgName($source);
-        static::assertSame($source, $this->subject->getUnpkgName());
+        self::assertSame($source, $this->subject->getUnpkgName());
     }
 
     /**
@@ -163,7 +163,7 @@ public function testUnpkgVersion(): void
     {
         $source = '';
         $this->subject->setUnpkgVersion($source);
-        static::assertSame($source, $this->subject->getUnpkgVersion());
+        self::assertSame($source, $this->subject->getUnpkgVersion());
     }
 
     /**
@@ -174,7 +174,7 @@ public function testUnpkgSource(): void
     {
         $source = '';
         $this->subject->setUnpkgSource($source);
-        static::assertSame($source, $this->subject->getUnpkgSource());
+        self::assertSame($source, $this->subject->getUnpkgSource());
     }
 
     /**
@@ -185,7 +185,7 @@ public function testCopyTarget(): void
     {
         $target = '';
         $this->subject->setCopyTarget($target);
-        static::assertSame($target, $this->subject->getCopyTarget());
+        self::assertSame($target, $this->subject->getCopyTarget());
     }
 
     /**
@@ -196,6 +196,6 @@ public function testUnpkgFiles(): void
     {
         $files = [];
         $this->subject->setUnpkgFiles($files);
-        static::assertSame($files, $this->subject->getUnpkgFiles());
+        self::assertSame($files, $this->subject->getUnpkgFiles());
     }
 }
diff --git a/tests/unit/Copy/Unpkg/GenericTest.php b/tests/unit/Copy/Unpkg/GenericTest.php
index b93f8e3..4bba0f3 100644
--- a/tests/unit/Copy/Unpkg/GenericTest.php
+++ b/tests/unit/Copy/Unpkg/GenericTest.php
@@ -21,11 +21,11 @@
 use OpenMage\ComposerPlugin\Copy\Unpkg\Generic as Subject;
 use PHPUnit\Framework\TestCase;
 
-class GenericTest extends TestCase
+final class GenericTest extends TestCase
 {
     public Subject $subject;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $config = new Config();
         $config->setUnpkgName('name');
@@ -50,7 +50,7 @@ public function setUp(): void
      */
     public function testGetUnpkgName(): void
     {
-        static::assertSame('name', $this->subject->getUnpkgName());
+        self::assertSame('name', $this->subject->getUnpkgName());
     }
 
     /**
@@ -66,7 +66,7 @@ public function testGetUnpkgName(): void
      */
     public function testGetUnpkgVersion(): void
     {
-        static::assertSame('version', $this->subject->getUnpkgVersion());
+        self::assertSame('version', $this->subject->getUnpkgVersion());
     }
 
     /**
@@ -81,7 +81,7 @@ public function testGetUnpkgVersion(): void
      */
     public function testGetUnpkgSource(): void
     {
-        static::assertSame('source', $this->subject->getUnpkgSource());
+        self::assertSame('source', $this->subject->getUnpkgSource());
     }
 
     /**
@@ -96,7 +96,7 @@ public function testGetUnpkgSource(): void
      */
     public function testGetUnpkgFiles(): void
     {
-        static::assertSame([], $this->subject->getUnpkgFiles());
+        self::assertSame([], $this->subject->getUnpkgFiles());
     }
 
     /**
@@ -111,6 +111,6 @@ public function testGetUnpkgFiles(): void
      */
     public function testGetCopyTarget(): void
     {
-        static::assertSame('target', $this->subject->getCopyTarget());
+        self::assertSame('target', $this->subject->getCopyTarget());
     }
 }
diff --git a/tests/unit/PluginTest.php b/tests/unit/PluginTest.php
index faa36ac..51a1f5c 100644
--- a/tests/unit/PluginTest.php
+++ b/tests/unit/PluginTest.php
@@ -20,11 +20,11 @@
 use OpenMage\ComposerPlugin\Plugin as Subject;
 use PHPUnit\Framework\TestCase;
 
-class PluginTest extends TestCase
+final class PluginTest extends TestCase
 {
     public Subject $subject;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->subject = new Subject();
     }
@@ -46,7 +46,7 @@ public function testGetSubscribedEvents(): void
                 ],
             ],
         ];
-        static::assertSame($events, $this->subject->getSubscribedEvents());
+        self::assertSame($events, $this->subject->getSubscribedEvents());
     }
 
     /**
@@ -71,6 +71,6 @@ public function testGetSubscribedEvents(): void
      */
     public function testProcessCopy(): void
     {
-        static::assertNull($this->subject->processCopy(null));
+        self::assertNull($this->subject->processCopy(null));
     }
 }