diff --git a/src/Installer.php b/src/Installer.php
index 51ae12fc487cd534e7f04b2496b9b7b2535f4083..73b2606add2ccf52066cd248695d4522a7112ce1 100644
--- a/src/Installer.php
+++ b/src/Installer.php
@@ -22,21 +22,26 @@ namespace Higidi\ComposerPhpCSStandardsPlugin;
  */
 
 use Composer\Composer;
-use Composer\IO\IOInterface;
 use Composer\Installer\BinaryInstaller;
 use Composer\Installer\LibraryInstaller;
+use Composer\IO\IOInterface;
 use Composer\Package\PackageInterface;
 use Composer\Repository\InstalledRepositoryInterface;
 use Composer\Util\Filesystem;
+use Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Finder;
 use Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standard\Standard;
 use Higidi\ComposerPhpCSStandardsPlugin\PHPCodeSniffer\Standards;
 use Symfony\Component\Filesystem\Filesystem as SymfonyFilesystem;
-use Symfony\Component\Finder\Finder;
 
 class Installer extends LibraryInstaller
 {
     const TYPE = 'phpcodesniffer-standard';
 
+    /**
+     * @var Finder
+     */
+    protected $finder;
+
     /**
      * Initializes library installer.
      *
@@ -51,9 +56,11 @@ class Installer extends LibraryInstaller
         Composer $composer,
         $type = self::TYPE,
         Filesystem $filesystem = null,
-        BinaryInstaller $binaryInstaller = null
+        BinaryInstaller $binaryInstaller = null,
+        Finder $finder
     ) {
         parent::__construct($io, $composer, $type, $filesystem, $binaryInstaller);
+        $this->finder = $finder ?: new Finder();
     }
 
     /**
@@ -195,17 +202,7 @@ class Installer extends LibraryInstaller
      */
     protected function findStandards($basePath)
     {
-        $standards = new Standards();
-        $finder = new Finder();
-        $finder
-            ->in($basePath . '/**/Standards/*/')
-            ->files()->name('ruleset.xml');
-        foreach ($finder as $ruleSetFile) {
-            $standard = new Standard($ruleSetFile->getPath());
-            $standards->addStandard($standard);
-        }
-
-        return $standards;
+        return $this->finder->in($basePath);
     }
 
     /**