diff --git a/tests/lib/db/mdb2schemamanager.php b/tests/lib/db/mdb2schemamanager.php
index dd9ee3adb8eadb34406605ecaf73b5d4ec28a579..527b2cba6484390f5a3e8cd03d9db7877e78bca1 100644
--- a/tests/lib/db/mdb2schemamanager.php
+++ b/tests/lib/db/mdb2schemamanager.php
@@ -9,6 +9,9 @@
 
 namespace Test\DB;
 
+use Doctrine\DBAL\Platforms\OraclePlatform;
+use Doctrine\DBAL\Platforms\SQLServerPlatform;
+
 class MDB2SchemaManager extends \PHPUnit_Framework_TestCase {
 
 	public function tearDown() {
@@ -22,11 +25,14 @@ class MDB2SchemaManager extends \PHPUnit_Framework_TestCase {
 
 	public function testAutoIncrement() {
 
-		if (\OC::$server->getConfig()->getSystemValue('dbtype', 'sqlite') === 'oci') {
+		$connection = \OC_DB::getConnection();
+		if ($connection->getDatabasePlatform() instanceof OraclePlatform) {
 			$this->markTestSkipped('Adding auto increment columns in Oracle is not supported.');
 		}
+		if ($connection->getDatabasePlatform() instanceof SQLServerPlatform) {
+			$this->markTestSkipped('DB migration tests are not supported on MSSQL');
+		}
 
-		$connection = \OC_DB::getConnection();
 		$manager = new \OC\DB\MDB2SchemaManager($connection);
 
 		$manager->createDbFromStructure(__DIR__ . '/ts-autoincrement-before.xml');
diff --git a/tests/lib/db/migrator.php b/tests/lib/db/migrator.php
index 2e49086bd6334b946d69138cdf80dc0c905149ed..09742a53eb4688ab438217673e4e234101836ae6 100644
--- a/tests/lib/db/migrator.php
+++ b/tests/lib/db/migrator.php
@@ -10,6 +10,8 @@
 namespace Test\DB;
 
 use \Doctrine\DBAL\DBALException;
+use Doctrine\DBAL\Platforms\OraclePlatform;
+use Doctrine\DBAL\Platforms\SQLServerPlatform;
 use \Doctrine\DBAL\Schema\Schema;
 use \Doctrine\DBAL\Schema\SchemaConfig;
 
@@ -28,8 +30,11 @@ class Migrator extends \PHPUnit_Framework_TestCase {
 
 	public function setUp() {
 		$this->connection = \OC_DB::getConnection();
-		if ($this->connection->getDriver() instanceof \Doctrine\DBAL\Driver\OCI8\Driver) {
-			$this->markTestSkipped('DB migration tests arent supported on OCI');
+		if ($this->connection->getDatabasePlatform() instanceof OraclePlatform) {
+			$this->markTestSkipped('DB migration tests are not supported on OCI');
+		}
+		if ($this->connection->getDatabasePlatform() instanceof SQLServerPlatform) {
+			$this->markTestSkipped('DB migration tests are not supported on MSSQL');
 		}
 		$this->manager = new \OC\DB\MDB2SchemaManager($this->connection);
 		$this->tableName = 'test_' . uniqid();
@@ -73,7 +78,7 @@ class Migrator extends \PHPUnit_Framework_TestCase {
 	 */
 	public function testDuplicateKeyUpgrade() {
 		if ($this->isSQLite()) {
-			$this->markTestSkipped('sqlite doesnt throw errors when creating a new key on existing data');
+			$this->markTestSkipped('sqlite does not throw errors when creating a new key on existing data');
 		}
 		list($startSchema, $endSchema) = $this->getDuplicateKeySchemas();
 		$migrator = $this->manager->getMigrator();
diff --git a/tests/lib/dbschema.php b/tests/lib/dbschema.php
index c07e32a404e3a40211eccc5bb82b9922fe41c435..d31bd34124e53b134ab957b148ffdc2fc188065e 100644
--- a/tests/lib/dbschema.php
+++ b/tests/lib/dbschema.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Copyright (c) 2012 Bart Visscher <bartv@thisnet.nl>
  * This file is licensed under the Affero General Public License version 3 or
@@ -6,6 +7,8 @@
  * See the COPYING-README file.
  */
 
+use OCP\Security\ISecureRandom;
+
 class Test_DBSchema extends PHPUnit_Framework_TestCase {
 	protected $schema_file = 'static://test_db_scheme';
 	protected $schema_file2 = 'static://test_db_scheme2';
@@ -16,7 +19,8 @@ class Test_DBSchema extends PHPUnit_Framework_TestCase {
 		$dbfile = OC::$SERVERROOT.'/tests/data/db_structure.xml';
 		$dbfile2 = OC::$SERVERROOT.'/tests/data/db_structure2.xml';
 
-		$r = '_'.OC_Util::generateRandomBytes(4).'_';
+		$r = '_' . \OC::$server->getSecureRandom()->getMediumStrengthGenerator()->
+			generate(4, ISecureRandom::CHAR_LOWER . ISecureRandom::CHAR_DIGITS) . '_';
 		$content = file_get_contents( $dbfile );
 		$content = str_replace( '*dbprefix*', '*dbprefix*'.$r, $content );
 		file_put_contents( $this->schema_file, $content );
@@ -38,6 +42,10 @@ class Test_DBSchema extends PHPUnit_Framework_TestCase {
 	 * @medium
 	 */
 	public function testSchema() {
+		$platform = \OC_DB::getConnection()->getDatabasePlatform();
+		if ($platform instanceof \Doctrine\DBAL\Platforms\SQLServerPlatform) {
+			$this->markTestSkipped("Test not relevant on MSSQL");
+		}
 		$this->doTestSchemaCreating();
 		$this->doTestSchemaChanging();
 		$this->doTestSchemaDumping();
@@ -80,8 +88,8 @@ class Test_DBSchema extends PHPUnit_Framework_TestCase {
 	 * @param string $table
 	 */
 	public function assertTableNotExist($table) {
-		$type=OC_Config::getValue( "dbtype", "sqlite" );
-		if( $type == 'sqlite' || $type == 'sqlite3' ) {
+		$platform = \OC_DB::getConnection()->getDatabasePlatform();
+		if ($platform instanceof \Doctrine\DBAL\Platforms\SqlitePlatform) {
 			// sqlite removes the tables after closing the DB
 			$this->assertTrue(true);
 		} else {