diff --git a/core/modules/config/src/Tests/ConfigSingleImportExportTest.php b/core/modules/config/src/Tests/ConfigSingleImportExportTest.php
index a5b8386..d7f9c7f 100644
--- a/core/modules/config/src/Tests/ConfigSingleImportExportTest.php
+++ b/core/modules/config/src/Tests/ConfigSingleImportExportTest.php
@@ -20,7 +20,8 @@ class ConfigSingleImportExportTest extends WebTestBase {
   public static $modules = [
     'block',
     'config',
-    'config_test'
+    'config_test',
+    'language',
   ];
 
   protected function setUp() {
diff --git a/core/tests/Drupal/KernelTests/Core/Config/Storage/StorageReplaceDataWrapperTest.php b/core/tests/Drupal/KernelTests/Core/Config/Storage/StorageReplaceDataWrapperTest.php
new file mode 100644
index 0000000..389f505
--- /dev/null
+++ b/core/tests/Drupal/KernelTests/Core/Config/Storage/StorageReplaceDataWrapperTest.php
@@ -0,0 +1,95 @@
+<?php
+
+namespace Drupal\KernelTests\Core\Config\Storage;
+
+use Drupal\config\StorageReplaceDataWrapper;
+use Drupal\Core\Config\StorageInterface;
+
+/**
+ * Tests StorageReplaceDataWrapper operations.
+ *
+ * @group config
+ */
+class StorageReplaceDataWrapperTest extends ConfigStorageTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->storage = new StorageReplaceDataWrapper($this->container->get('config.storage'));
+    // ::listAll() verifications require other configuration data to exist.
+    $this->storage->write('system.performance', array());
+    $this->storage->replaceData('system.performance', array('foo' => 'bar'));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function read($name) {
+    return $this->storage->read($name);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function insert($name, $data) {
+    $this->storage->write($name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function update($name, $data) {
+    $this->storage->write($name, $data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function delete($name) {
+    $this->storage->delete($name);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function testInvalidStorage() {
+    // No-op as this test does not make sense.
+  }
+
+  /**
+   * Tests if new collections created correctly.
+   *
+   * @param string $collection
+   *   The collection name.
+   *
+   * @dataProvider providerCollections
+   */
+  public function testCreateCollection($collection) {
+    $expected_collection = $this->storage->getCollectionName();
+
+    // Create new storage with given and check collection set correctly.
+    $new_storage = $this->storage->createCollection($collection);
+    $new_collection = $new_storage->getCollectionName();
+    $this->assertSame($collection, $new_collection);
+
+    // Check collection not changed in the current storage instance.
+    $actual_collection = $this->storage->getCollectionName();
+    $this->assertSame($expected_collection, $actual_collection);
+  }
+
+  /**
+   * Data provider for testing different collections.
+   *
+   * @return array
+   *   Returns an array of collection names.
+   */
+  public function providerCollections() {
+    return [
+      [StorageInterface::DEFAULT_COLLECTION],
+      ['foo.bar'],
+    ];
+  }
+
+}