diff --git a/Application/ApplicationManager.php b/Application/ApplicationManager.php
index bac390484..2d1114338 100644
--- a/Application/ApplicationManager.php
+++ b/Application/ApplicationManager.php
@@ -160,8 +160,6 @@ final class ApplicationManager
      *
      * @return void
      *
-     * @throws InvalidModuleException Throws this exception in case the installer doesn't exist
-     *
      * @since 1.0.0
      */
     public function reInit(string $appPath) : void
@@ -216,7 +214,7 @@ final class ApplicationManager
      * @param bool   $useCache Use Cache
      * @param string $basePath Base path for the applications
      *
-     * @return array<string, ModuleInfo>
+     * @return array<string, ApplicationInfo>
      *
      * @since 1.0.0
      */
diff --git a/Application/InstallerAbstract.php b/Application/InstallerAbstract.php
index 9cb33bdfb..59b243ce5 100644
--- a/Application/InstallerAbstract.php
+++ b/Application/InstallerAbstract.php
@@ -29,6 +29,12 @@ use phpOMS\System\File\Local\Directory;
  */
 abstract class InstallerAbstract
 {
+    /**
+     * Path of the file
+     *
+     * @var string
+     * @since 1.0.0
+     */
     public const PATH = '';
 
     /**
diff --git a/Application/StatusAbstract.php b/Application/StatusAbstract.php
index 6a1b08033..91a26a031 100644
--- a/Application/StatusAbstract.php
+++ b/Application/StatusAbstract.php
@@ -31,6 +31,12 @@ use phpOMS\Utils\Parser\Php\ArrayParser;
  */
 abstract class StatusAbstract
 {
+    /**
+     * Path of the file
+     *
+     * @var string
+     * @since 1.0.0
+     */
     public const PATH = '';
 
     /**
diff --git a/Application/UninstallerAbstract.php b/Application/UninstallerAbstract.php
index 690a425c8..3ed34de3f 100644
--- a/Application/UninstallerAbstract.php
+++ b/Application/UninstallerAbstract.php
@@ -28,6 +28,14 @@ use phpOMS\DataStorage\Database\Schema\Builder as SchemaBuilder;
  */
 abstract class UninstallerAbstract
 {
+    /**
+     * Path of the file
+     *
+     * @var string
+     * @since 1.0.0
+     */
+    public const PATH = '';
+
     /**
      * Install module.
      *
diff --git a/Module/InstallerAbstract.php b/Module/InstallerAbstract.php
index e63f63e38..ecbfeff35 100644
--- a/Module/InstallerAbstract.php
+++ b/Module/InstallerAbstract.php
@@ -29,6 +29,14 @@ use phpOMS\DataStorage\Database\Schema\Builder as SchemaBuilder;
  */
 abstract class InstallerAbstract
 {
+    /**
+     * Path of the file
+     *
+     * @var string
+     * @since 1.0.0
+     */
+    public const PATH = '';
+
     /**
      * Install module.
      *
@@ -58,7 +66,7 @@ abstract class InstallerAbstract
      */
     protected static function createTables(DatabasePool $dbPool, ModuleInfo $info) : void
     {
-        $path = \dirname($info->getPath()) . '/Admin/Install/db.json';
+        $path = static::PATH . '/Install/db.json';
         if (!\is_file($path)) {
             return;
         }
@@ -86,8 +94,10 @@ abstract class InstallerAbstract
      */
     protected static function activate(DatabasePool $dbPool, ModuleInfo $info) : void
     {
-        /** @var StatusAbstract $class */
-        $class = '\Modules\\' . $info->getDirectory() . '\Admin\Status';
+        $classPath = \substr(\realpath(static::PATH) . '/Status', \strlen(\realpath(__DIR__ . '/../../')));
+
+         /** @var StatusAbstract $class */
+        $class = \str_replace('/', '\\', $classPath);
         $class::activate($dbPool, $info);
     }
 
@@ -103,7 +113,10 @@ abstract class InstallerAbstract
      */
     public static function reInit(ModuleInfo $info, ApplicationInfo $appInfo = null) : void
     {
-        $class = '\Modules\\' . $info->getDirectory() . '\Admin\Status';
+        $classPath = \substr(\realpath(static::PATH) . '/Status', \strlen(\realpath(__DIR__ . '/../../')));
+
+         /** @var StatusAbstract $class */
+        $class = \str_replace('/', '\\', $classPath);
         $class::activateRoutes($info, $appInfo);
         $class::activateHooks($info, $appInfo);
     }
diff --git a/Module/StatusAbstract.php b/Module/StatusAbstract.php
index a5d5d40a2..56d534116 100644
--- a/Module/StatusAbstract.php
+++ b/Module/StatusAbstract.php
@@ -35,6 +35,14 @@ use phpOMS\Utils\Parser\Php\ArrayParser;
  */
 abstract class StatusAbstract
 {
+    /**
+     * Path of the file
+     *
+     * @var string
+     * @since 1.0.0
+     */
+    public const PATH = '';
+
     /**
      * Deactivate module.
      *
@@ -65,7 +73,7 @@ abstract class StatusAbstract
      */
     public static function activateRoutes(ModuleInfo $info, ApplicationInfo $appInfo = null) : void
     {
-        $directories = new Directory(\dirname($info->getPath()) . '/Admin/Routes');
+        $directories = new Directory(static::PATH . '/Routes');
 
         /** @var Directory|File $child */
         foreach ($directories as $child) {
@@ -145,7 +153,7 @@ abstract class StatusAbstract
      */
     public static function activateHooks(ModuleInfo $info, ApplicationInfo $appInfo = null) : void
     {
-        $directories = new Directory(\dirname($info->getPath()) . '/Admin/Hooks');
+        $directories = new Directory(static::PATH . '/Hooks');
 
         /** @var Directory|File $child */
         foreach ($directories as $child) {
@@ -199,7 +207,7 @@ abstract class StatusAbstract
      */
     public static function deactivateRoutes(ModuleInfo $info, ApplicationInfo $appInfo = null) : void
     {
-        $directories = new Directory(\dirname($info->getPath()) . '/Admin/Routes');
+        $directories = new Directory(static::PATH . '/Routes');
 
         /** @var Directory|File $child */
         foreach ($directories as $child) {
@@ -275,7 +283,7 @@ abstract class StatusAbstract
      */
     public static function deactivateHooks(ModuleInfo $info, ApplicationInfo $appInfo = null) : void
     {
-        $directories = new Directory(\dirname($info->getPath()) . '/Admin/Hooks');
+        $directories = new Directory(static::PATH . '/Hooks');
 
         /** @var Directory|File $child */
         foreach ($directories as $child) {
diff --git a/Module/UninstallerAbstract.php b/Module/UninstallerAbstract.php
index 0826e38e5..afdef6a88 100644
--- a/Module/UninstallerAbstract.php
+++ b/Module/UninstallerAbstract.php
@@ -28,6 +28,14 @@ use phpOMS\DataStorage\Database\Schema\Builder as SchemaBuilder;
  */
 abstract class UninstallerAbstract
 {
+    /**
+     * Path of the file
+     *
+     * @var string
+     * @since 1.0.0
+     */
+    public const PATH = '';
+
     /**
      * Install module.
      *
@@ -58,7 +66,10 @@ abstract class UninstallerAbstract
     protected static function deactivate(DatabasePool $dbPool, ModuleInfo $info) : void
     {
         /** @var StatusAbstract $class */
-        $class = '\Modules\\' . $info->getDirectory() . '\Admin\Status';
+        $classPath = \substr(\realpath(static::PATH) . '/Status', \strlen(\realpath(__DIR__ . '/../../')));
+
+         /** @var StatusAbstract $class */
+        $class = \str_replace('/', '\\', $classPath);
         $class::deactivate($dbPool, $info);
     }
 
@@ -74,8 +85,7 @@ abstract class UninstallerAbstract
      */
     public static function dropTables(DatabasePool $dbPool, ModuleInfo $info) : void
     {
-        $path = \dirname($info->getPath()) . '/Admin/Install/db.json';
-
+        $path = static::PATH . '/Install/db.json';
         if (!\is_file($path)) {
             return;
         }
diff --git a/Stdlib/Graph/Graph.php b/Stdlib/Graph/Graph.php
index efe174229..16a598ea9 100644
--- a/Stdlib/Graph/Graph.php
+++ b/Stdlib/Graph/Graph.php
@@ -555,13 +555,13 @@ class Graph
             $cNode   = \array_pop($stack);
             $nodes[] = $cNode;
 
-            if (!isset($visited[$cNode->getId()]) || !$visited[$cNode->getId()]) {
+            if (!isset($visited[$cNode->getId()]) || $visited[$cNode->getId()] === false) {
                 $visited[$cNode->getId()] = true;
             }
 
             $neighbors = $cNode->getNeighbors();
             foreach ($neighbors as $neighbor) {
-                if (!isset($visited[$cNode->getId()]) || !$visited[$cNode->getId()]) {
+                if (!isset($visited[$cNode->getId()]) || $visited[$cNode->getId()] === false) {
                     $stack[] = $neighbor;
                 }
             }
diff --git a/tests/Application/Testapp/Admin/Installer.php b/tests/Application/Testapp/Admin/Installer.php
index aff5dec23..0acc23a51 100644
--- a/tests/Application/Testapp/Admin/Installer.php
+++ b/tests/Application/Testapp/Admin/Installer.php
@@ -26,5 +26,11 @@ use phpOMS\Application\InstallerAbstract;
  */
 final class Installer extends InstallerAbstract
 {
-	public const PATH = __DIR__;
+    /**
+     * Path of the file
+     *
+     * @var string
+     * @since 1.0.0
+     */
+    public const PATH = __DIR__;
 }
diff --git a/tests/Application/Testapp/Admin/Uninstaller.php b/tests/Application/Testapp/Admin/Uninstaller.php
index a6c987390..a8e0e0299 100644
--- a/tests/Application/Testapp/Admin/Uninstaller.php
+++ b/tests/Application/Testapp/Admin/Uninstaller.php
@@ -24,7 +24,13 @@ use phpOMS\Application\UninstallerAbstract;
  * @link    https://orange-management.org
  * @since   1.0.0
  */
-final class Uninstaller extends UninstallerAbstract
+final class Installer extends InstallerAbstract
 {
-	public const PATH = __DIR__;
+    /**
+     * Path of the file
+     *
+     * @var string
+     * @since 1.0.0
+     */
+    public const PATH = __DIR__;
 }
diff --git a/tests/DataStorage/Cache/Connection/RedisCacheTest.php b/tests/DataStorage/Cache/Connection/RedisCacheTest.php
index 7d8e2b416..d05061d51 100644
--- a/tests/DataStorage/Cache/Connection/RedisCacheTest.php
+++ b/tests/DataStorage/Cache/Connection/RedisCacheTest.php
@@ -150,7 +150,11 @@ class RedisCacheTest extends \PHPUnit\Framework\TestCase
     {
         $this->cache->set('key1', 'testVal1');
         $this->cache->set('key2', 'testVal2');
-        self::assertEquals(['testVal1', 'testVal2'], $this->cache->getLike('key\d'));
+
+        $result = $this->cache->getLike('key\d');
+        self::assertEquals(2, \count($result));
+        self::assertTrue(\in_array('testVal1', $result))
+        self::assertTrue(\in_array('testVal2', $result))
     }
 
     public function testExpiredGetLike() : void
diff --git a/tests/Message/Mail/MailHandlerTest.php b/tests/Message/Mail/MailHandlerTest.php
index b392bd3bc..20a4ecf6e 100644
--- a/tests/Message/Mail/MailHandlerTest.php
+++ b/tests/Message/Mail/MailHandlerTest.php
@@ -41,12 +41,12 @@ class MailHandlerTest extends \PHPUnit\Framework\TestCase
 
     public function testSendTextWithMail() : void
     {
-        if (!\file_exists('/usr/sbin/sendmail') && empty(\ini_get('sendmail_path'))) {
+        $this->handler->setMailer(SubmitType::MAIL);
+
+        if (!\file_exists($this->handler->mailerTool)) {
             self::markTestSkipped();
         }
 
-        $this->handler->setMailer(SubmitType::MAIL);
-
         $mail = new Email();
         $mail->setFrom('test1@orange-management.email', 'Dennis Eichhorn');
         $mail->addTo('test@orange-management.email', 'Dennis Eichhorn');
@@ -62,12 +62,12 @@ class MailHandlerTest extends \PHPUnit\Framework\TestCase
 
     public function testSendTextWithSendmail() : void
     {
-        if (!\file_exists('/usr/sbin/sendmail') && empty(\ini_get('sendmail_path'))) {
+        $this->handler->setMailer(SubmitType::SENDMAIL);
+
+        if (!\file_exists($this->handler->mailerTool)) {
             self::markTestSkipped();
         }
 
-        $this->handler->setMailer(SubmitType::SENDMAIL);
-
         $mail = new Email();
         $mail->setFrom('test1@orange-management.email', 'Dennis Eichhorn');
         $mail->addTo('test@orange-management.email', 'Dennis Eichhorn');
@@ -83,12 +83,12 @@ class MailHandlerTest extends \PHPUnit\Framework\TestCase
 
     public function testSendHtmlWithMail() : void
     {
-        if (!\file_exists('/usr/sbin/sendmail') && empty(\ini_get('sendmail_path'))) {
+        $this->handler->setMailer(SubmitType::MAIL);
+
+        if (!\file_exists($this->handler->mailerTool)) {
             self::markTestSkipped();
         }
 
-        $this->handler->setMailer(SubmitType::MAIL);
-
         $mail = new Email();
         $mail->setFrom('test1@orange-management.email', 'Dennis Eichhorn');
         $mail->addTo('test@orange-management.email', 'Dennis Eichhorn');
@@ -109,12 +109,12 @@ class MailHandlerTest extends \PHPUnit\Framework\TestCase
 
     public function testSendHtmlWithSendmail() : void
     {
-        if (!\file_exists('/usr/sbin/sendmail') && empty(\ini_get('sendmail_path'))) {
+        $this->handler->setMailer(SubmitType::SENDMAIL);
+
+        if (!\file_exists($this->handler->mailerTool)) {
             self::markTestSkipped();
         }
 
-        $this->handler->setMailer(SubmitType::SENDMAIL);
-
         $mail = new Email();
         $mail->setFrom('test1@orange-management.email', 'Dennis Eichhorn');
         $mail->addTo('test@orange-management.email', 'Dennis Eichhorn');
diff --git a/tests/Module/Testmodule/Admin/Installer.php b/tests/Module/Testmodule/Admin/Installer.php
index 5ff2eeb0a..df22b5ce7 100644
--- a/tests/Module/Testmodule/Admin/Installer.php
+++ b/tests/Module/Testmodule/Admin/Installer.php
@@ -26,4 +26,11 @@ use phpOMS\Module\InstallerAbstract;
  */
 final class Installer extends InstallerAbstract
 {
+    /**
+     * Path of the file
+     *
+     * @var string
+     * @since 1.0.0
+     */
+    public const PATH = __DIR__;
 }