diff --git a/test/SP/Services/Install/DbTestUtilTrait.php b/test/SP/Services/Install/DbTestUtilTrait.php
index 5a7ba622..62cca7a7 100644
--- a/test/SP/Services/Install/DbTestUtilTrait.php
+++ b/test/SP/Services/Install/DbTestUtilTrait.php
@@ -68,8 +68,11 @@ trait DbTestUtilTrait
      */
     private function createUser($user, $pass, $database)
     {
-        $this->getConnection()
-            ->query(sprintf('GRANT ALL PRIVILEGES ON `%s`.* TO \'%s\'@\'%s\' IDENTIFIED BY \'%s\'', $database, $user, SELF_IP_ADDRESS, $pass));
+        $query = 'GRANT ALL PRIVILEGES ON `%s`.* TO \'%s\'@\'%s\' IDENTIFIED BY \'%s\'';
+
+        $conn = $this->getConnection();
+        $conn->query(sprintf($query, $database, $user, SELF_IP_ADDRESS, $pass));
+        $conn->query(sprintf($query, $database, $user, SELF_HOSTNAME, $pass));
     }
 
     /**
@@ -81,7 +84,7 @@ trait DbTestUtilTrait
     private function dropUser($user, $host)
     {
         $this->getConnection()
-            ->query(sprintf('DROP USER \'%s\'@\'%s\'', $user, $host));
+            ->query(sprintf('DROP USER IF EXISTS \'%s\'@\'%s\'', $user, $host));
     }
 
     /**
diff --git a/test/SP/Services/Install/InstallerTest.php b/test/SP/Services/Install/InstallerTest.php
index 34641271..18d5b21c 100644
--- a/test/SP/Services/Install/InstallerTest.php
+++ b/test/SP/Services/Install/InstallerTest.php
@@ -33,6 +33,7 @@ use SP\Services\Install\InstallData;
 use SP\Services\Install\Installer;
 use SP\Storage\Database\DBUtil;
 use SP\Storage\Database\MySQLHandler;
+use SP\Util\Util;
 use function SP\Test\getResource;
 use function SP\Test\saveResource;
 use function SP\Test\setupContext;
@@ -111,8 +112,12 @@ class InstallerTest extends TestCase
         $this->assertTrue(self::$dic->get(MasterPassService::class)->checkMasterPassword($params->getMasterPassword()));
 
         $this->dropDatabase(self::DB_NAME);
-        $this->dropUser($configData->getDbUser(), SELF_IP_ADDRESS);
-        $this->dropUser($configData->getDbUser(), SELF_HOSTNAME);
+
+        $this->dropUser($configData->getDbUser(), $params->getDbAuthHost());
+
+        if ($params->getDbAuthHostDns()) {
+            $this->dropUser($configData->getDbUser(), $params->getDbAuthHostDns());
+        }
     }
 
     /**
@@ -259,12 +264,15 @@ class InstallerTest extends TestCase
      */
     public function testHostingMode()
     {
+        $pass = Util::randomPassword();
+
+        $this->dropDatabase(self::DB_NAME);
         $this->createDatabase(self::DB_NAME);
-        $this->createUser('syspass_user', '123456', self::DB_NAME);
+        $this->createUser('syspass_user', $pass, self::DB_NAME);
 
         $params = new InstallData();
         $params->setDbAdminUser('syspass_user');
-        $params->setDbAdminPass('123456');
+        $params->setDbAdminPass($pass);
         $params->setDbName(self::DB_NAME);
         $params->setDbHost(getenv('DB_SERVER'));
         $params->setAdminLogin('admin');
@@ -290,6 +298,7 @@ class InstallerTest extends TestCase
 
         $this->dropDatabase(self::DB_NAME);
         $this->dropUser('syspass_user', SELF_IP_ADDRESS);
+        $this->dropUser('syspass_user', SELF_HOSTNAME);
     }
 
     protected function tearDown()
diff --git a/test/SP/Services/Install/MySQLTest.php b/test/SP/Services/Install/MySQLTest.php
index 9a0f88a0..2a708dd9 100644
--- a/test/SP/Services/Install/MySQLTest.php
+++ b/test/SP/Services/Install/MySQLTest.php
@@ -56,21 +56,6 @@ class MySQLTest extends TestCase
         $this->assertFalse($mysql->checkDatabaseExist());
     }
 
-    /**
-     * @throws \SP\Storage\Database\DatabaseException
-     * @throws \SP\Core\Exceptions\SPException
-     */
-    public function testCheckDatabaseExist()
-    {
-        $this->createDatabase(self::DB_NAME);
-
-        $mysql = new MySQL($this->getParams(), new ConfigData());
-
-        $this->assertTrue($mysql->checkDatabaseExist());
-
-        $this->dropDatabase(self::DB_NAME);
-    }
-
     /**
      * @return InstallData
      */
@@ -91,6 +76,21 @@ class MySQLTest extends TestCase
         return $params;
     }
 
+    /**
+     * @throws \SP\Storage\Database\DatabaseException
+     * @throws \SP\Core\Exceptions\SPException
+     */
+    public function testCheckDatabaseExist()
+    {
+        $this->createDatabase(self::DB_NAME);
+
+        $mysql = new MySQL($this->getParams(), new ConfigData());
+
+        $this->assertTrue($mysql->checkDatabaseExist());
+
+        $this->dropDatabase(self::DB_NAME);
+    }
+
     /**
      * @throws \SP\Core\Exceptions\SPException
      */
diff --git a/test/SP/Storage/FileHandlerTest.php b/test/SP/Storage/FileHandlerTest.php
index 53ccd117..ffe5da27 100644
--- a/test/SP/Storage/FileHandlerTest.php
+++ b/test/SP/Storage/FileHandlerTest.php
@@ -151,10 +151,6 @@ class FileHandlerTest extends TestCase
         (new FileHandler(self::$validFile))
             ->clearCache()
             ->checkIsReadable();
-
-        (new FileHandler(self::$immutableFile))
-            ->clearCache()
-            ->checkIsReadable();
     }
 
     /**
diff --git a/test/res/config/config.xml b/test/res/config/config.xml
index 0debbb4c..ac956218 100644
--- a/test/res/config/config.xml
+++ b/test/res/config/config.xml
@@ -9,11 +9,11 @@
   <authBasicAutoLoginEnabled>1</authBasicAutoLoginEnabled>
   <authBasicDomain></authBasicDomain>
   <authBasicEnabled>1</authBasicEnabled>
-  <backup_hash>7073a41c8032d93be23cda9eea07f9c3527f54da</backup_hash>
+  <backup_hash>e4ec7e7979447922d90ef4280172177256c162b8</backup_hash>
   <checkUpdates>0</checkUpdates>
   <checknotices>0</checknotices>
-  <configDate>1532375214</configDate>
-  <configHash>a4658216020fa81739ab6f100a0d96170a0e5f90</configHash>
+  <configDate>1532379104</configDate>
+  <configHash>5819af570a83290a50935bb1e8397d24c74b87aa</configHash>
   <configSaver></configSaver>
   <configVersion></configVersion>
   <databaseVersion></databaseVersion>
@@ -32,7 +32,7 @@
   <dokuwikiUrlBase></dokuwikiUrlBase>
   <dokuwikiUser></dokuwikiUser>
   <encryptSession>0</encryptSession>
-  <export_hash>7768216134c3c60d24989d670ed6e26d3006347a</export_hash>
+  <export_hash>25cdc5c691636d478367f88a5e9bb3fc043097d2</export_hash>
   <filesAllowedExts>
     <item type="filesAllowedExts">PDF</item>
     <item type="filesAllowedExts">JPG</item>